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C14-EC- 405
Model question paper-I
BOARD DIPLOMA EXAMINATION, (C-14)
DECE-IV Semester EXAMINATION
Microprocessor & Microcontroller Programming



Time 3 Hours]                             [TOTAL MARKS:80




PART-A




Instructions: (1) Answer allquestions.
(2) Each question carries three marks.
(3) Answers should be brief and straight to the point and shall
not exceed five simple sentences.



 


  1. Define operation code, operand with examples
    2 Give the function of status flags
    3.List the features of 8051micro controller
    4.Compare Microprocessors and Microcontrollers
    5.Give the instruction format of 8051
    6.Define the terms machine language, assembly language
    7.Define stack and stack pointer
    8.Explain the term debugging a program
    9.List RS232 pins of DB 25 connectors
    10.Explain MAX 232 interfacing



PART-B



Instructions: (1) Answer any five questions.
(2) Each question carries ten marks.
(3) Answers should be comprehensive and the criterion for valuation is the content but not the length of the answers.

 

11.Draw the block diagram of a 8085 microprocessor and explain the function
of each block.
12.(a)Explain about the IN instruction along with the timing diagram of 8085
microprocessor
(b)Explain PUSH and POP instructions of 8051 microcontroller
13.Explain the momory organization of 8051 microcontroller
14.a) Draw the pin out diagram of 8051 and label the names
b)Explain interrupts in 8051
15. Explain the timing diagrams for memory read operations of 8051
16. Explain the various addressing modes of 8051 with examples
17a).Explain different types of subroutine techniques.
b) Write a program to multiply two 8bit numbers stored in the locations 2400H
and 2401H. Store the result in the locations 2402H and 2403H
18.Write a program to generate a square wave of any frequency

 

C14-EC- 405
Model question paper-I
BOARD DIPLOMA EXAMINATION, (C-14)
DECE-IV Semester EXAMINATION
Microprocessor & Microcontroller Programming



Time 3 Hours]                             [TOTAL MARKS:80




PART-A



Instructions: (1) Answer allquestions.
(2) Each question carries three marks.
(3) Answers should be brief and straight to the point and shall
not exceed five simple sentences.


  1. List the features of micro processors

  2. List the latest processors used in Desktop/laptop computers.

  3. Explain I/O ports of 8051
    4.Give any six Special Function Register’s of 8051
    5.State the need for an instruction set
    6.Define machine cycle and T-state.
    7.List and draw the various symbols used in drawing flow charts

  4. Write a program to add any two 8-bit numbers.

  5. List RS232 pins of DB9 connectors

  6. Explain MAX 233 interfacing
    [Contd….



PART-B



Instructions: (1) Answer any five questions.
(2) Each question carries ten marks.
(3) Answers should be comprehensive and the criterion for
valuation is the content but not the length of the answers.


11.Explain execution of STA instruction with the help of timing diagrams
12.(a) Define fetch cycle, execution cycle and instruction cycle of 8085
(b)Write a program to generate the time delay using a register of 8051 baed system
.Assume that the crystal frequency of the system is 25MHZ.
13.Give the pin diagram of 8051 micro controller and specify the purpose of each pin
14.Explain the memory organization of 8051
15.Explain any five data transfer instructions of 8051 with examples
16.Explain unconditional and conditional jump instructions
17.(a)Explain about different debugging techniques.
(b)Write a program to multiply two 8 bit numbers
18.Write a program to generate a square wave of 50%duty cycle with timer1 in Mode1 on the port pin 2.6 using subroutine technique. Determine the time delay generated by the timer for the value of the count 1009H.Assume that crystal frequency of the system is 12MHZ



 

C14-EC- 403



Model question paper-I



BOARD DIPLOMA EXAMINATION, (C-14)



DECE-IV Semester EXAMINATION



Network Analysis



Time 3 Hours]                                                                     [TOTAL MARKS:80 



PART-A



Instructions:           (1) Answer all questions.

(2) Each question carries three marks.

(3) Answers should be brief and straight to the point and shall

not exceed five simple sentences.

1.State Kirchhoff’s current law and Kirchhoff’s voltage law

2.Explain briefly Ideal Voltage Source

3.Define ( i) Driving point Impedance ( ii) Transfer Impedance

4.Draw the dual of the given Series circuit

5.State and explain Super position Theorem

6.Write any three limitations of Norton’s theorem

7.Define Steady State Response and Transient Response

8.Define Open Circuit Impedance of a Two-Port Network

9.Define Equalizer

10.Define Pass Band and Stop Band                         

  PART-B



Instructions:           (1) Answer any five questions.

(2) Each question carries ten marks.

(3) Answers should be comprehensive and the criterion for

valuation is the content but not the length of the answers.

11.Explain the concept of Mutual Inductance as a circuit parameter

12.In the network of fig. below find the Mesh currents I1,I2,I3 using Driving Point Impedance and the Transfer Impedances 

13.Using Nodal method find the voltage VA in the circuit shown below which makes the current in 10 Resistor is Zero

14.Find the voltage Vx  in the circuit shown below and verify the Reciprocity Theorem 

 

 

 

 

 

 

 

15.Determine the Norton’s Equivalent circuit at terminals AB



 

 

 

 

 

 

 

16. A Series RL circuit with R = 30 AND L = 15H has a constant voltage V= 60V applied at t= 0 as shown in fig. below. Determine the current the voltage across Resistor and Inductor  at t = 0.2 Sec.



 

 

 

 

 

 

 

 

17 .Find the Z- Parameters  of a T-Network shown in fig. below



18.Design a π- Section Constant-K High Pass Filter with Cut-Off Frequency 12 KHz and design Impedance of 500

 ******************************************************



                                                                                                                                                C14-EC- 403



Model question paper-II



BOARD DIPLOMA EXAMINATION, (C-14)



DECE-IV Semester EXAMINATION



Network Analysis



Time 3 Hours]                                                                     [TOTAL MARKS:80 



PART-A

Instructions:           (1) Answer all questions.

(2) Each question carries three marks.

(3) Answers should be brief and straight to the point and shall

not exceed five simple sentences.

1.Define the terms (i) Mutual Inductance (ii) Coefficient of coupling

2.Explain briefly Ideal Current Source

3.Define ( i) Driving point Admittance ( ii) Transfer Admittance

4.Determine the number of Mesh Equations required to solve the given network



 

 

 

 

 

 

 

 

5.State and explain Reciprocity Theorem

6.Write any three limitations of Super position theorem

7.Define Time Constant of a RC Circuit

8.Define Short Circuit Admittance of a Two-Port Network

9.Define (i) Neper and (ii) Decibel

10.Write any three applications of Equalizer

 

  PART-B



Instructions:           (1) Answer any five questions.

(2) Each question carries ten marks.

(3) Answers should be comprehensive and the criterion for

valuation is the content but not the length of the answers.

11.Explain the DOT Rule for Coupled Circuits

12.Find the Node Voltages V1,V2



 

 

 

 

 

 

13.In the Network of fig. below the source V1 results in a voltage across ( 2-j2) Impedance. Using Mesh Analysis find the source V1 which corresponds to V0 = 5∟0



14.Determine the Maximum Power delivered to the Load in the Circuit shown below



15.Find the voltage across 2 Resistor by using Super Position Theorem



 

 

 

 

 

 

 

16.For the circuit shown below

(i)  Find the time constant

(ii) After how many time constants will the current have decayed to one –half of its maximum value

17 .Find the Transmission Parameters  for the given Network

 

 

 

 

 

 

 

 

18.Design a  T-Type Attenuator to give an Attenuation of 60 Db to work in a line of 500Ώ Impedance

C14-EC- 402



Model question paper-I



BOARD DIPLAMA EXAMINATION, (C-14)



DECE-IV Semester EXAMINATION



Linear Integrated Circuits



Time 3 Hours]                                                [TOTAL MARKS:80



PART-A



Instructions:           (1) Answer all questions.

(2) Each question carries three marks.

(3) Answers should be brief and straight to the point and shall

not exceed five simple sentences.


  1. List different IC packages. Draw the shape of above package types.

  2. List 6 merits of SMT Technology.

  3. State the function of an operational amplifier.

  4. Give the Pin  configuration of IC 741.

  5. List 6 applications of multivibrators.

  6. List the types of IC regulators and give the advantage of IC regulators.

  7. List the different types of clippers.

  8. List the applications of PLL.

  9. Write any three Advantages of instrumentation amplifier.

  10. Define the terms resolution, Accuracy, Monotonicity of D/A converter.



[Contd….

 

PART-B

Instructions:           (1) Answer any five questions.

(2) Each question carries ten marks.

(3) Answers should be comprehensive and the criterion for

valuation is the content but not the length of the answers.

 


  1. Describe the manufacturing process of monolithic ICs.

  2. Explain the Inverting amplifier configuration of Op Amp. Draw the input and output waveforms and derive the equation for voltage gain.

  3. Draw and explain OP-Amp Wein-bridge Oscillator circuit.

  4. Draw and explain the working of OP-Amp Bistable multi vibrator with waveforms.

  5. Explain the unbiased and biased clippers with waveforms.

  6. Draw and explain the block diagram of PLL – LM565.

  7. Explain the Voltage to current converter circuit.

  8. Explain A/D conversion using counter method.



 

******************



 

 

C14-EC- 402

Model question paper-II



BOARD DIPLAMA EXAMINATION, (C-14)



DECE-IV Semester EXAMINATION



Linear Integrated Circuits



Time 3 Hours]                                                                     [TOTAL MARKS:80



PART-A

Instructions:           (1) Answer all questions.

(2) Each question carries three marks.

(3) Answers should be brief and straight to the point and shall

not exceed five simple sentences.


  1. Explain various levels of integration.

  2. Mention the power rating of different IC packages.

  3. State the important characteristics of ideal operational amplifier.

  4. Give the pin configuration of single supply Op Amp LM324.

  5. Distinguish between voltage and current time-base generation and list their applications.

  6. Classify Multi vibrators.

  7. Mention the applications of clippers and clampers.

  8. Define capture range of PLL.

  9. List 3 applications of Current to Voltage converter.

  10. State the need for D/A conversion.



[Contd….

 

PART-B



Instructions:           (1) Answer any five questions.

(2) Each question carries ten marks.

(3) Answers should be comprehensive and the criterion for

Valuation is the content but not the length of the answers.

 


  1. Describe the fabrication of diode and transistor on monolithic IC.

  2. Explain the Non Inverting amplifier configuration of Op Amp and derive the formula for Voltage gain.

  3. Draw and explain the working of OP-Amp Bistable multi vibrator with waveforms.

  4. Draw and explain the working of OP-Amp Schmitt trigger circuit.

  5. Explain the principle of clamper circuit with waveforms.

  6. Explain the working of astable multi using 555 IC.

  7. Explain the Current to Voltage converter circuit .

  8. Explain D/A conversion using R-2R ladder network.



 

******************



 

 

Board Diploma Examinations


IV Semester Examinations


Model Question Paper-I


Engineering Mathematics-III


(C-14 Scheme)


 

Max Marks:  80                                                                              Time: 3 Hrs

Part-A




  • Answer all questions.

  • Each question carries three marks.

  • Answer should be brief and straight to the point                            10x3=30 marks




  1. Solve the equation  

  2. Solve (D 4- 8D2+ 16) y = 0.

  3. Find the Particular Integral for (D2+ 4) y = Sin2x + e-2x.

  4. State the change of scale property and first shifting theorem of Laplace Transforms.

  5. Find the Laplace Transform of 4e2t + 6t3-3 Cos 5t + Sin t.



6.Find the inverse Laplace Transform of .

7.Find inverse Laplace Transform of 

8.Write the Euler’s formulae for Fourier series of a function f(x) in the Interval [C, C+2π].

9.Find the half range Fourier Sine series of unity in (0, π).

10.State Addition and Multiplication Theorems of Probability for two events.

 

Part-B                                     10x5 = 50 marks




  •   Answer any five questions.

  •  Each question carries ten marks.

  •  Answer should be comprehensive and the criteria for valuation are the content but not the length of the answer.



11 (a) Solve (D2 + D -6) y = e-3x.

(b) Solve (D3 +4D) y = 5 + Cos 2x.

12(a) Solve (D2 + 2D +1) y = 2x + x2.

(b) Solve (D4- 16) y = Cos 2x + Sinh 2x.

13 (a) Find the Laplace Transform of t2. Cos t.

    (b) Find the Laplace Transform of  

14 (a) Find  .

(b) Find  using Convolution theorem.


  1. Find Fourier series for the function 



16 (a) Expand f(x) =   as Fourier Series in (-2 , 2).

(b) Find the half range Cosine series for f(x) = x in (0, 2).

17 (a) When two dice are thrown, find the probability of getting a sum 7.

(b) In a hostel 60% students Telugu news paper, 40% students read English news paper and 20% read both the papers. A student is selected at random, find the probability that the Student reads neither Telugu nor English news paper.

18 (a) Let A and B are independent events with P (A) = 0.3 and P (B) = 0.4. Fin      

 

(b) Box-I contains 8 white , 2 black balls, Box–II contains 5 white , 5 black balls and Box-III contains 4 white , 6 black balls. A box is selected at random and a ball is drawn from it, what is the probability that the ball is white.

 

Board Diploma Examinations


IV Semester Examinations


Model Question Paper-II


Engineering Mathematics-III


(C-14 Scheme)


 

Max Marks:  80                                                  Time: 3 Hrs

Part-A


  • Answer all questions.

  • Each question carries three marks.

  • Answer should be brief and straight to the point                            10x3=30 marks




  1. Solve the equation 

  2. Solve (D 4- 5D2 + 4) y = 0.

  3. Find the Particular Integral for (D2 + D -6) y = e3x+ e-3x.

  4. Find the Laplace Transform of Sin3t.Cos4t.

  5. Define Convolution of two functions and state the convolution theorem.

  6. Find the inverse Laplace Transform of 

  7. Find inverse Laplace Transform of 

  8. Write the Euler’s formulae for Fourier series of a function f(x) in the Interval [C, C+2l].

  9. Find the Fourier Coefficient in

  10. An integer is picked from 1 to 20 numbers, both inclusive. Find the probability that it is a prime.



Part-B                                        10x5 = 50 marks


  • Answer any five questions.

  • Each question carries ten marks.

  •  Answer should be comprehensive and the criteria for valuation are the content but not the length of the answer.



11(a) Solve (D2 - 4) y = (1+ ex) 2.

(b) Solve (D2 + 4D + 16) y =  Sin 4x.

12(a) Solve (D2 - 2D +1) y = x3.

(b) Solve (D4- 81) y = Sinh 3x + x.

13(a) Find the Laplace Transform of t.e-t .Sin 4t.

    (b) Evaluate   using Laplace Transforms.

14 (a) Find   

(b) Find 


  1. Find Fourier series for the function 



16 (a) Expand f(x) =   as Fourier series in –π < x < π.

(b) Find the half range Sine series for f(x) = 

17 (a) When two dice are thrown, find the probability of getting a sum even number.

(b) In a committee of 25 members, each member is proficient either in mathematics or in statistics or in both. If 19 of these are proficient mathematics, 16 in statistics.Find the probability that a person selected from the committee is proficient in both.

18 (a) Let A and B are independent events with P (A) = 0.8 and P (B) = 0.4. Find



(b) Box-I contains 3 red, 4 black balls, Box–II contains 5 red , 6 black balls. one ball is drawn at random from one of the bags and is found to be red. What is the probability that the ball is drawn from box-II.

Engineering Mathematics

BOARD DIPLOMA EXAMINATIONS (C-14)



DEE – THIRD SEMESTER EXAMINATIONS



GENERAL MECHANICAL ENGINEERING



Time: 3 Hours               Total marks: 80



     PART-A                                         10X3=30



 



Instructions:   1) Answer all questions.

2) Each question carries three marks.

3) Answer should be brief and straight to the point and shall not exceed five Simple sentences 


  1. List out the types of loads and describe any two loads with neat sketches?

  2. Define the terms stress & strain & its units?

  3. What is shaft? State its functions.

  4. Define polar moment of Inertia?

  5. State any 8 components of an IC engine and mention their functions?

  6. Define BDC, TDC & stroke length?

  7. State the principle of water tube boiler?

  8. Write the applications of steam turbine?

  9. Name different properties of lubricants?

  10. What are the advantages of centrifugal pump over the other pumps?



 

PART-B                                              5X10=50



 

Instructions:   1) Answer any five questions.

2) Each question carries ten marks.

3) Answer should be comprehensive and criterion for valuation is the content

   but not the length of the answer.   


  1. Explain stress-Strain diagram for a ductile material indicating the salient points

  2. A bar of varying section is loaded as shown in fig determine the total elongation. If E= 2x105 N/mm2





13.Design a suitable diameter of a solid shaft to transmit 110KW of power at 240 rpm , if the allowable stress is not to exceed 70 N/mm2 and twist not to exceed 10 in a length of 3m . Take G=0.8 x 105N/mm2

14.Explain with the help of line sketch the working principle of four stroke diesel engine?15.Describe the working of a simple carburetor with a neat sketch?

16.Describe the working of Babcock and Wilcox boiler with a neat sketch?

17.Differentiate between impulse turbine & reaction turbine?

18.Draw a simple sketch showing the installation & working of a centrifugal pump indicating various components & hydraulic heads?

 

BOARD DIPLOMA EXAMINATIONS (C-14)



DME – THIRD SEMISTER EXAMINATIONS



GENERAL MECHANICAL ENGINEERING



Time: 3Hours                                                                      Total marks: 80 



     PART-A                                         10 X 3=30



Instructions:   1) Answer all questions.

2) Each question carries three marks.

3) Answer should be brief and straight to the point and shall not exceed five

         Simple sentences 


  1. Define lateral strain & poisson’s ratio?

  2. Define the hook’s law & proportional limit?

  3. Define the torsion? Which stress is induced in shaft, when it is subjected to twisting moment?

  4. A solid shaft is to transmit350 KW of power at 110 rpm if the maximum shear stress is induced must not exceed 80N/mm2; find the diameter of the shaft?

  5. What is an internal combustion engine?

  6. List out any six parts of an IC engine?

  7. Name different types of boiler mountings?

  8. Write the application of steam turbines?

  9. Write about priming of centrifugal pumps?

  10. Name different properties of lubricants?



 

PART-B                                              5X10=50

Instructions:   1) Answer any five questions.

2) Each question carries ten marks.

3) Answer should be comprehensive and criterion for valuation is the content

   but not the length of the answer.   

 


  1. A bar of 30 mm dia is subjected to a pull of 60KN. The measured extension over a gauge length of 200 mm is 0.09 mm and change in dia is 0.0039 mm. Find the Poisson's ratio and the values of the three moduli.

  2. A bar of varying section is loaded as shown in fig determine the total elongation. If E= 2x105 N/mm2





 


  1. A hollow shaft is required to transmit 400kw at 240 rpm. The maximum torque is 20% greater than the mean. The permissible shear stress is 60 N/mm2. The twist in a length of 4m is not to exceed 150. The ratio between inner and outer diameter is 2/3, calculate inner and outer diameters of the shaft. Take G = 80KN/mm2.

  2. Explain working principle of 2 stroke petrol engine with neat sketch?

  3. a) Compare two stroke engines with four stroke engines?

  4. b) Compare Compression ignition engine with Spark ignition engine?

  5. Explain the working of Benson boiler with a neat sketch?

  6. With a neat sketch explain the working of impulse turbine?

  7. Explain the working and constructional details of a centrifugal pump with a neat sketch.



 

Board Diploma Examinations



III Semester DEEE



Model paper-I



Electronics-I (EE-305)



 



Time : 3 hrs                                        Max Marks : 80 Marks



                                      PART- A                                10 x 3 = 30



Answer all the questions

Each question carries three marks.


  1. Define (i) Resistance (ii) Capacitance?

  2. List the applications of capacitors?

  3. Draw the symbols of NPN and PNP transistors?

  4. Draw the bridge rectifier circuit?

  5. State the need of filter?

  6. List the applications of the UJT?

  7. Draw the symbols of FET and SCR?

  8. List the causes for instability of bias in amplifier?

  9. Define the D.C operating point in amplifiers?

  10. List different types of coupling methods?



 

PART- B                                         5 x 10 = 50

Answer any five questions

Each question carries ten marks.

 


  1. Explain about colour code used in calculating a resistance value?

  2. Explain the operation of zener diode and draw its characteristics?

  3. Explain the working principle of full wave rectifier with waveforms?

  4. Draw and explain the working of a uni junction transistor?

  5. Explain the construction and working of a LCD?

  6. Draw and explain about the potential divider bias in amplifiers?

  7. Draw and state the function of each component in transformer coupled amplifier?

  8. Draw the frequency response characteristics of RC coupled amplifier and indicate the gain band width, upper cut-off and lower cut-off frequencies






 

Board Diploma Examinations



III Semester DEEE



Model paper-II



Electronics-I (EE-305)



 



Time : 3 hrs.                                    Max Marks : 80 Marks



                                            PART- A                                10 x 3 = 30



Answer all the questions

Each question carries three marks.


  1. Define (i) Self-inductance (ii) Mutual inductance?

  2. Mention the specifications of resistors?

  3. State the different transistor configurations?

  4. Draw the half wave rectifier circuit?

  5. List the different types of filter?

  6. List the applications of the SCR?

  7. Draw the symbols of LED and photo transistor?

  8. State the necessity of proper biasing for amplifier?

  9. List different biasing methods used in amplifiers?

  10. State the necessity of cascading of amplifiers?





PART- B                              5 x 10 = 50



Answer any five questions

Each question carries ten marks.


  1. Explain the losses in i) Inductors and ii) Transformers?

  2. Explain the working of PN Junction diode with no bias, forward bias and reverse bias?

  3. Explain the working principle of bridge wave rectifier with waveforms?

  4. Draw and explain the working of a field effect transistor (FET)?

  5. Explain the construction and working of a SCR?

  6. Draw and explain about the collector to base bias in amplifiers?

  7. Draw and state the function of each component in RC coupled amplifier?

  8. Classify amplifiers on the basis of i) frequency ii) function iii) type of load iv) period of Conduction and v) Number of stages?

                               BOARD DIPLOMA EXAMINATIONS, (C-14)

                                DEEE-THIRD SEMISTER EXAMINATIONS

                                                 MODEL PAPER-I

          ELECTRICAL & ELECTRONIC MEASURING INSTRUMENTS

                                                 SUB CODE:EE-304.

Time:3hour                                                                                              Total marks:80

PART –A

Answer all the question each carries 3 marks                               10 x 3 = 30


  1. State the types of secondary instruments

  2. Distinguish between Absolute and Secondary instruments

  3. List the applications of M.C Instruments

  4. List the errors commonly occurring in M.I. Instruments.

  5. List the methods of measurement of

  6. i) Low resistance ii)Medium resistance and      iii)High resistance

  7. Distinguish between shunt and series Ohm-meters

  8. State the need of Transducers in Measurement systems

  9. List the applications of sensors.

  10. List analog electronic Instruments.

  11. List the types of digital Voltmeters



 

PART –B



Answer any five questions each carries ten marks                5 x 10= 50


  1. (a)State the uses of Tong tester (clamp meter).(5) (b) Classify the electromechanical instruments according to Principle of Working (5)

  2. Describe the construction and working of Attraction type Moving Iron (M.I) Instrument

  3. Describe the construction and working of a dynamometer type instrument

  4. Describe construction and connections of a 3-phase energy meter.

  5. List the errors commonly occurring in M.I. Instruments and suggest their remedies

  6. Explain the construction and working of Megger

  7. Explain the measurement of temperature using Thermister in a Bridge circuit.

  8. Explain the Working of Single Phase Digital Energy meter with block diagram.

ELECTRICAL & ELECTRONIC MEASURING INSTRUMENTS



Subject Title              :           Electrical & Electronic Measuring Instruments

Subject Code             :           EE - 304



 



              BOARD DIPLOMA EXAMINATIONS, (C-14)



 

                DEEE-THIRD SEMISTER EXAMINATIONS


    MODEL PAPER-I


                         ELECTRICAL & ELECTRONIC MEASURING INSTRUMENTS


                                                           SUB CODE:EE-304



Time:3hour                                                                                              Total marks:80

                                                                    PART –A

Answer all the question each carries 3 marks                       10 x 3 = 30 marks


  1. List any six important electrical quantities to be measured by giving their units.

  2. Define i) accuracy ii) precision     iii) error

  3. List the three types of errors commonly occurring in moving coil (M.C.)instruments

  4. List the applications of CT and PT.

  5. List the applications of Potentiometer.

  6. Classify the resistance into Low , Medium and High Values

  7. State the applications of Transducers.

  8. Write about Semiconductor sensors.

  9. List analog electronic Instruments.

  10. State the uses of Tong tester (clamp meter).



 

PART –B



Answer any five questions each carries 10 marks                        5 x 10 = 50


  1. (a) Explain the methods of obtaining i)deflecting torque ii) controlling torque    and iii) damping torque in indicating instruments.(5)



(b) Mention the specifications of digital voltmeter.(5)2.

2.Explain the working of Permanent Magnet Moving Coil Instrument (Voltmeter/Ammeter)

3.Describe the construction of a dynamometer type instrument

4.Describe the construction of a 1-phase induction type Energy meter

5.Explain the construction and working of Weston synchroscope

6.State the construction and working principle of basic Potentiometer

7.Describe the working of Linear Variable Differential Transformer(LVDT).

8.Explain the Working of Three Phase Digital Energy meter with block diagram.

 

BOARD DIPLOMA EXAMINATIONS, (C-14)



DEEE-THIRD SEMISTER EXAMINATIONS
MODEL PAPER
EE-302  D.C. MACHINES
Time: 3Hours Total marks: 80






PART-A


NOTE: Answer all questions.                                                             3X 10=30

Each question carries three marks.

 


  1. State the Fleming’s right hand rule?

  2. Define (a) Pole pitch (b) Back pitch (c) Front pitch?

  3. Draw the power flow diagram of d.c generator?

  4. State the causes of sparking at brush of d.c generator?

  5. List the advantages of parallel operation of d.c generator?

  6. A 4 pole 500V, shunt motor has 720 wave wound armature conductors. The full load armature current is 60A, and the flux/pole is 0.03Wb.The armature resistance is 0.2ohm and the contact drop is 1V/Brush, Calculate the full load speed of the motor?




  1. State the different losses in D.C motors?

  2. State the factors that affect the speed of a D.C motor?

  3. Draw the connection diagram for speed control of d.c.series motor

  4. What are the disadvantages of Swinburne’s Test.



 

  PART-B                                                5 X 10=50
Instructions: 1) Answer any five questions.
                      2) Each answer carries ten marks.


  1. Explain the construction of a dc generator with neat sketch?

  2. . Classify the D.C generators based on excitation along with voltage and current equations, showing diagrammatically?




  1. A100kw, 400V, 6pole dc shunt generator has a lap wound armature with 36 slots and 28 Conductors per slot. The shunt field resistance is 100 ohms. The brush is given a lead of 12°. Calculate the Demagnetising and cross magnetising AT/Pole?




  1. Explain O.C.C, Internal and external characteristics of D.C Shunt generator?

  2. (i) Classify DC motors in to different types with figures of each. Also write voltage and Current  equation?



(ii) Derive an equation for armature torque in dc motors?


  1. (i) Derive the condition for maximum efficiency of D.C motor?



(ii) A 220V, dc shunt motor takes 5A at no load when running at 700r.p.m. the field Resistance is 200ohms.aThe resistance of armature is stand still gave a drop of 5V Across armature terminals when 10Amps wave passed through it. Calculate (i) speed on load (ii) torque in N.M (iii) Efficiency.


  1. Draw the schematic diagram of a 3-point starter and explain the working with protective devices?




  1. A 250V 15KW Shunt motor has a maximum efficiency of 88% and a speed of 750 r.p.m when delivering 75% of its rated output. The resistance of its shunt field is 100ohms.Calculate the efficiency when the motor draws a current of 78Amp from mains?



 

 

BOARD DIPLOMA EXAMINATIONS, (C-14)




DEEE-THIRD SEMISTER EXAMINATIONS
MODEL PAPER
EE-302  D.C. MACHINES
Time: 3Hours Total marks: 80







PART-A


NOTE: Answer all questions. 3X 10=30

Each question carries three marks.


  1. Write about dynamically induced EMF?


  2. Compare Lap and wave winding in different aspects?


  3. Draw the separately excited D.C generator and name the parts?


  4. List the effect of armature reaction in D.C machines?


  5. Draw the external characteristic curve of a D.C shunt generator?


  6. State the Fleming’s left hand rule?


  7. Why series motor is having high starting torque?


  8. State the necessity of speed control of d.c. motor


  9. State the necessity of starter in d.c motor?


  10. What is meant by Regenerative Test.




  PART-B                                                5 X 10=50
Instructions: 1) Answer any five questions.
                      2) Each answer carries ten marks.

Each question carries ten marks.


  1. Explain the working of simple loop D.C Generator?




  2. A shunt generator delivers 195A, at terminal p.d of 250V. The armature resistance and
    shunt field resistance are 0.02ohm and 50ohm respectively. The iron and friction losses
    equal 950 W .




Find (i) Emf generated (ii) Copper losses (iii) o/p of prime mover (iv) Electrical efficiency?


  1. Derive the formula for De-magnetising AT/Pole & Cross magnetising A T/Pole for a d.c
    generator?




  2. A 4pole lap wound dc generator with 450armature conductors supplies a current of
    150amps. The brushes have been displaced through 3 angular degrees from the
    geometrical neutral axis. Calculate (i) Demagnetising AT/pole (ii) Cross magnetising
    AT/pole (iii) The additional field current for neutralising the demagnetisation is the field
    winding has 1000 turns/pole?




  3. (i) explain the principle operation of D.C Motor with neat sketches?




(ii) Explain the significance of back EMF in dc motors and its formula?


  1. Explain the different losses & power stages in d.c motor?




  2. A 200V shunt motor has armature resistance of 0.04ohm and runs at 1000 rpm, when
    the armature current is 60A.If the torque is unchanged; find the speed and armature
    current when the field strength is reduced by 20%?




  3. Explain how break test is conducted on d.c shunt motor with a neat sketch, also write
    the merits and de-merits of the test?




 

 

BOARD DIPLOMA EXAMINATIONS, (C-14)
DEEE-THIRD SEMISTER EXAMINATIONS
MODEL PAPER-II
ELECTRICAL CIRCUITS
SUB CODE:EE-303


Time: 3 Hours                        Total marks: 80





                                           PART-A                                                10 X 3=30


Instructions: 1) Answer all questions.
              2) Each answer carries three marks.
              3) Answer should be brief and straight to the point and shall not exceed
                   five simple sentences.


  1. Define junction, branch and loop in circuits.

  2. State the limitations of ohm’s law.

  3. Define (a) cycle (b) time period (c) frequency.

  4. Convert the polar form 100 /͟30° into rectangular form.

  5. Define RMS value and average value.

  6. A pure inductance coil taken a current of 15 amps for 200volts, 50 Hz, AC Supply find the inductance of the coil.

  7. Define resonance and write the formula for the resonant frequency for RLC series circuit.

  8. Why a parallel resonant circuit is called a rejecter circuit.

  9. List the advantages of poly phase system over single phase system.

  10. State the relation between line voltage and phase voltage, line current and phase current in delta connected network.



  PART-B                                                5 X 10=50
Instructions: 1) Answer any five questions.
                      2) Each answer carries ten marks.





  1. Two batteries E1 and E2 have emf’s 6 volts and 2volts respectively and external resistances of 2 ohms and 3 ohm respectively are connected in parallel across 5 ohms resistor. Calculate (a) the current in each of the battery (b) the potential difference across 5ohms resistor.

  2. Derive the formula for delta to star transformation.

  3. State and explain about thevenens theorem.

  4. (a) Explain about phase and phase difference.



(b) A sine wave has a peak valve of 50 volts Determine

(i) RMS value (ii) Average value (iii)    form factor.


  1. A resistance of 12 ohms, an inductance of 0.15 H and a capacitance of 100 micro farad are connected in series across a 100V, 50HZ, AC supply.



Calculate, (a) Impedance (b) current (c) power factor (d) power consumed.


  1. Draw and explain the graphical representation of series resonance and indicate the following in the graph.



(a) Resonant frequency (b) net reactance (c) impedance (d) current.


  1. (a) Define Q factor of a parallel resonant circuit.



(b) A coil of 20 ohms resistance and an inductance of 0.2H is connected in parallel with a   condenser of 100 micro farad capacitance. Calculate the frequency at which the circuit will act as a non inductance resistance of “R”ohms.also find the value of “R”.


  1. Derive the formula for measurement of 3 phase power and power factor by using two watt meter method (balanced load).



 

 

BOARD DIPLOMA EXAMINATIONS, (C-14)
DEEE-THIRD SEMISTER EXAMINATIONS
MODEL PAPER-I
ELECTRICAL CIRCUITS
SUB CODE:EE-303


Time: 3 Hours                        Total marks: 80





                                           PART-A                                                10 X 3=30


Instructions: 1) Answer all questions.
              2) Each answer carries three marks.
              3) Answer should be brief and straight to the point and shall not exceed
                   five simple sentences.




  1. Define (a) Active circuit (b) Passive circuit (c) linear circuit?

  2. State Kirchhoff’s laws?

  3. Define (a) Frequency (b) Form factor (c) Peak factor?

  4. Convert the rectangular form (10+j15) into polar form?

  5. Write an expression for RMS value and average value of full wave rectified sine wave?

  6. Define Q-Factor series resonant circuit?

  7. The current flowing through a pure capacitor is 23amps.Find the capacitance, when the voltage applied across the capacitor v=200sin314t.

  8. Define Resonance and write the equation for resonant frequency for parallel circuit?

  9. State the relation between the line voltage and phase voltage, line current and phase current in star connected network?

  10. (a) Define the term “Poly phase ”
    (b) What is meant by phase sequence?



                  PART-B                                                5 X 10=50
Instructions: 1) Answer any five questions.
                      2) Each answer carries ten marks.




11.A wheat stone bridge ABCD is arranged as follows. AB=10 ohm, BC=10 ohm, CD=4 ohm, DA=50 ohm. A galvanometer of 20 ohm resistance is connected across BD. Calculate the current through the galvanometer when p.d of 10 volts is maintained across A&C.
12. Derive the formulas for star to delta transformation.
13. State and explain Maximum power transfer theorem and mention its applications.
14. (a) Define RMS value and Average value?
(b) A sinusoidal wave is represented by i=42.42sin628t. Determine its (a) RMS value (b) form factor (c) peak factor.
15. A coil of resistance 100 ohms and inductance of 0.318 H is connected in series with a capacitor across a 230 V, 50 Hz, AC Supply. If the current drawn is 1.15/͟60° amps. Calculate the capacitance of the capacitor, voltage across inductance and power consumed in the circuit.
16. A coil of resistance 2 ohms and inductance of 0.01 H is connected in series with a capacitor across 200 V supply. What must be the capacitor in order that maximum current occurs at a frequency of 50 Hz. Also find (a) maximum current (b) voltage across the coil (c) voltage across the capacitor.
17. A circuit of (10+j15) ohms is connected in parallel with another circuit of (6-j8) ohms this is connected across 220 volts, 50 Hz, AC supply. Find (a) total current (b) total power drawn by the circuit. Also draw the vector diagram.
18. A 3 phase 400 volts motor has a power factor of 0.4 lagging. Two watt meters are connected in the circuit to measure the input. They show that the input to be 30 kw.find the reading of each instrument.

 

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