C-14 ELECTRICAL CIRCUITS Subject code : EE-303
SYLLABUS FOR UNIT TESTS
ELECTRICAL
CIRCUITS
Subject code : EE-303
Syllabus for
unit test –I
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Sl. No.
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Major Topics
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Periods
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Weightage
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Short Questions
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Essay Questions
|
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1.
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D.C
Circuits
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12
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26
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02
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02
|
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2
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Network
Theorems
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6
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10
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-
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01
|
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3
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Fundamental
of A.C.
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8
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19
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03
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01
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Syllabus for unit test -II
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4
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Single
phase A.C. circuits
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14
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26
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02
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02
|
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5
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Parallel
circuits
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8
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13
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01
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01
|
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6
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Poly phase
circuits
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12
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16
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02
|
01
|
|
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Total
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60
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110
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10
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08
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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
NOTE:
Answer all questions
2*3=6
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
NOTE: Answer all questions 2*3=6
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.
