SYLLABUS FOR UNIT TESTS
ELECTRICAL
CIRCUITS
Subject code : EE303
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 TESTI
MODEL PAPERI
PARTA
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.
PARTB
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 TESTI
MODEL
PAPERII
PARTA
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
PARTB
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 TESTII
MODEL
PAPERI
PARTA
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 3phase delta connected system.
PARTB
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 TESTII
MODEL PAPERII
PARTA
NOTE: Answer all questions 2*3=6
Each
question carries two marks
1. Define QFactor of RLC series circuit.
2. State the conditions for resonance in
parallel AC circuits.
3. List the advantages of poly phase system
over single phase system.
PARTB
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= (6j8) 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.
BOARD DIPLOMA EXAMINATIONS, (C14)
DEEETHIRD SEMISTER EXAMINATIONS
MODEL PAPERI
ELECTRICAL CIRCUITS
SUB CODE:EE303
Time: 3Hours Total marks: 80
PARTA 10X3=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 QFactor 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?
PARTB 5*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 (6j8) 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.
BOARD DIPLOMA EXAMINATIONS, (C14)
DEEETHIRD SEMISTER EXAMINATIONS
MODEL PAPERII
ELECTRICAL CIRCUITS
SUB CODE: EE303
Time: 3Hours
Total marks: 80
PARTA 10X3=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.
PARTB
5*10=50
Instructions: 1) Answer any five questions.
2) Each answer
carries ten marks.
11. 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.
12. Derive the formula for delta to star
transformation.
13. State and explain about thevenens theorem.
14. (a) Explain about phase and phase difference.
(b) A sine wave has a peak valve of 50 volts Determine
(a) RMS value (b) Average value (c)
form factor.
15. 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.
16. 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.
17. (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”.
18. (a) Derive the formula for measurement of 3 phase
power and power factor by using two watt meter method (balanced load).