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### C-14 ELECTRICAL CIRCUITS Subject code : EE-303

SYLLABUS FOR UNIT TESTS

ELECTRICAL CIRCUITS

Subject code : EE-303

Syllabus for unit test –I

 Sl. No. Major Topics Periods Weightage Short Questions Essay Questions 1. D.C Circuits 12 26 02 02 2 Network Theorems 6 10 - 01 3 Fundamental of A.C. 8 19 03 01

Syllabus for unit test -II
 4 Single phase A.C. circuits 14 26 02 02 5 Parallel circuits 8 13 01 01 6 Poly phase circuits 12 16 02 01 Total 60 110 10 08

UNIT TEST-I
MODEL PAPER-I
PART-A

NOTE :   Answer all questions.                                                                   2*3=6
Each question carries two marks

1. State Kirchhoff’s laws
2. Define (a) RMS Value (b) Average Value
3. The current flowing in a circuit is expressed as i=200sin314t.calculate its frequency, form       factor and peak factor.
PART-B
NOTE:  Answer any two questions                                                                 2*7=14
Each question carries seven marks

4. Derive the formula for delta to star transformation.
5. State and explain super position theorem.
6. (A) Explain about phase and phase difference                                                                         (3)
(b)Write the formula for RMS value and average value of full wave rectified sine wave (2)
(c) Convert the A=100 /͟͟45° from polar to rectangular form                                                    (2)

UNIT TEST-I
MODEL PAPER-II
PART-A
Each question carries two marks

1. State the limitations of ohm’s law.
2. State the relation between poles, speed and frequency.
3. Define (a) frequency (b) form factor (c) junction
PART-B
NOTE: Answer any two questions                                             2*7=14
Each question carries seven marks

4. Two batteries E1 and E2 have emf’s12 volts and 8 volts respectively and external resonance of 2 ohms and 1 ohm respectively are connected in parallel across 10 ohms resistor. Calculate (a) the current in each of the battery and external resistor (b) the potential difference across external resistor.
5. State and explain maximum power transfer theorem.
6. (a) convert the rectangular (8+j6) into polar form
(b) An alternating current of frequency 60HZ has maximum value of 120 amp. Write down the equation for instantaneous value. Reckoning time from the instant the current is zero and the becoming positive. Find (a) the instantaneous value after 1/360 seconds (b) the time taken to reach 96 amps for the first time

UNIT TEST-II
MODEL PAPER-I
PART-A
NOTE :  Answer all questions                                                                 2*3=6
Each question carries two marks

1. Define resonance in series circuit
2. Define (a) conductance (b) susceptance (c) admittance
3. State the relations between line and phase values of delta connected method and also write the expression for power in 3-phase delta connected system.
PART-B
NOTE: Answer any two questions                                          2*7=14
Each question carries seven marks

4. 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.
5. A coil of 50 ohms resistance and an inductance of 0.3H is connected in parallel with a 50 micro farad capacitor. Calculate the frequency at which the circuit will act as non inductive resistances of “R”ohms also find the value of R.
6. Derive the relation between the phase and line voltages, phase and line current for a balanced 3phase load in star connected system.

UNIT TEST-II
MODEL PAPER-II
PART-A
Each question carries two marks

1. Define Q-Factor of R-L-C series circuit.
2. State the conditions for resonance in parallel AC circuits.
3. List the advantages of poly phase system over single phase system.
PART-B
NOTE: Answer any two questions                                                      2*7=14
Each question carries seven marks

4. A coil of resonance 40 ohms and inductance of 0.75 H form a part of RLC series circuits for which the resonance frequency is 60 HZ. Find the capacitance and also find (a) line current (b) power factor (c) voltage across the coil the supply voltage is 250V, 50HZ.
5. Two circuits of impedances Z1= (10+j15) ohms and Z2= (6-j8) ohms are connected in parallel across a 230 volts, 50Hz AC supply. Calculate the total current and power factor by each branch.
6. Derive an expression for power in 3 phase circuits by two watt meter method.

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