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Electrical Circuit Theory

Total questions: 50

Worksheet time: 17mins

Name
Class
Date
1.

1. SI unit of capacitance ?

a)

Farad

b)

voltage

c)

ampere

d)

henry

2.

ohm's law

a)

V=IZ

b)

V= IR

c)

1/2 CV

d)

G= 1/R

3.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12V

b)

1.3V

c)

10V

d)

6/3V

4.

What is the equivalent resistance (a.k.a total resistance) of the three resistors shown?

a)

2.0 Ω

b)

0.33 Ω

c)

3 Ω

d)

33 Ω

5.

This picture shows as 24V battery connected to an 8.0 Ω resistor. How much current run through the circuit?

a)

192 A

b)

2.0 A

c)

4.0 A

d)

3.0 A

6.
The voltage drop across the parallel resistors shown in the figure is?
a)
17.3 volts
b)
20.7 volts
c)
62.1 volts
d)
100 volts
7.

Which of the following component is used to make and break a circuit?

a)

Switch

b)

Wire

c)

Bulb

d)

All of the above

8.

Which of the formula defines KCL where i1, i2 are incoming currents and i3,i4 are outgoing currents from a node in a circuit?

a)

i4-i1=i2+i3

b)

i1-i2=i3-i4

c)

i1+i2=i3+i4

d)

i4-i1=i2+i3

9.

According to Kirchhoff's current law, the current in a parallel circuit is equal to?

a)

The total voltage drop

b)

The sum of the currents in each branch

c)

Zero

d)

The applied voltage

10.

What is a system of conductors and components forming a complete path for an electric current?

a)

Current

b)

Resistor

c)

Battery

d)

Circuit

11.

A circuit that contains only one path for current flow is called what?

a)

Series

b)

Load

c)

Broken

d)

Parallel

12.

Ohm‟s law is

a)

The relationship between voltage, current, and power

b)

The relationship between voltage, current, and resistance

c)

An equation for determining power 62

d)

A measurement of wattage losses

13.

Ohm's law is applicable to

a)

Vacuum tubes

b)

Semi - conductors

c)

Electrolytes

d)

None of these

14.

The circuit whose properties are same in either direction is known as

a)

Unilateral circuit

b)

Bilateral circuit

c)

Reversible circuit

d)

Irreversible circuit

15.

What is the total resistance of the three resistors in parallel with values of 2 ohms, 8 ohms, and 14 ohms?

a)

1.44 ohms

b)

2.65 ohms

c)

1.24 ohms

d)

2.24 ohms

16.

Three resistors of 6Ω are connected in parallel. So, what will be the equivalent resistance?

a)

3 Ω

b)

6 Ω

c)

2 Ω

d)

18 Ω

17.

In two - port network, what are the other names of Z parameters?

a)

Short circuit admittance parameter

b)

Open circuit Impedance parameter

c)

Short circuit impedance parameter

d)

Open circuit admittance parameter

18.

One watt is equal to

a)

Joule/second

b)

Newton -meter

c)

Volt/meter

d)

Newton/Coulomb

19.

The picture shows an electrical circuit. This circuit is a series circuit because:

a)

It has 3 light bulbs

b)

It uses a single battery.

c)

The same current flows through all three light bulbs.

d)

The electrical current is divided between the three light bulbs.

20.

In a parallel circuit if one of the light bulbs burns out the rest _________.

a)

stop the flow of electricity

b)

can still light up

c)

will go out

d)

of the light bulbs burn out also

21.

What is the effective resistance of the circuit shown?

a)

8 1/3 Ω

b)

24 Ω

c)

2.182 Ω

d)

11 Ω

22.

What power is developed in the 9 Ω resistor?

a)

144 Ω

b)

72 Ω

c)

16 Ω

d)

4 Ω

23.

What power is developed in the 12 Ω resistor?

a)

48 w

b)

144 w

c)

192 Ω

d)

48 Ω

24.

What is the power developed in the 250 Ω resistor?

a)

10 w

b)

14 w

c)

0.2 w

d)

24.7 w

25.

Both Conventional Current and Electron Flow are used. In general, the science disciplines use Electron Flow, whereas the engineering disciplines use Conventional Current.

a)

True

b)

False

26.

IN A CIRCUIT, 3 RESISTORS OF 3 OHM 5 OHM AND 13 OHM ARE CONNECTED IN SERIES WITH EACH OTHER . THE EQUIVALENT RESISTANCE OF THE CIRCUIT IS

a)

25

b)

21

c)

31

d)

6

27.

A LINEAR TWO TERIMNAL NETWORK CAN BE REPLACED BY A VOLTAGE SOURCE V0 IN SERIES WITH THE RSISTANCE Rth.

a)

NORTON'S THEORM

b)

MESH THEORM

c)

SUPERPOSITION THEORM

d)

THEVENIN'S THEORM

28.

FIND THE EQUIVALENT RESISTANCE

a)

1

b)

11

c)

6

d)

3.5

29.

The second step to nodal analysis is?

a)

Select mesh reference

b)

Select node as reference node

c)

Apply KCL to each non-reference node in the circuit

d)

Apply KCL to ground

30.

Based on KCL, currents will be regarded as negative or vice versa while ...

a)

Currents entering the node

b)

Currents have negative value

c)

Currents broke the node

d)

Currents leaving the node

31.

By using KCL we can get equations for i1 and i2 in the node A...

a)

i1+i2=0

b)

i1+2=i2

c)

i1+i2=2

d)

i2-i1=0

32.

In node analysis assume the voltage source is considered as one node is called

a)

Supernode

b)

Node

c)

Supermesh

d)

Voltage source

33.

In a three-phase system, the voltages are separated by

a)

45°

b)

120°

c)

180°

d)

90°

34.

Three similar coils are connected in delta across a three phase AC supply. The watt-meter readings are 12KW & 7KW . Calculate the power input

a)

5KW

b)

7KW

c)

19KW

d)

12KW

35.

three impedances (10+j 8) ohms are connected in star across a 400 V 3 phase supply. Determine the line and phase current

a)

18 A and 18 A respectively

b)

31.17 A and 18 A respectively

c)

10.39 A and 18 A respectively

d)

18 A and 10.39 A respectively

36.

when the two wattmeters used to measure a three phase power, give equal reading then the phase angle of the circuit is.

a)

60 degree

b)

30 degree

c)

90 degree

d)

0 degree

37.

For a balanced 3 phase AC system, what should be angle separation between the phases.

a)

180 deg

b)

120 deg

c)

90 deg

d)

0 deg

38.

In a -connected source driving a -connected load, the

a)

load voltage and line voltage are one-third the source voltage for a given phase

b)

load voltage and line voltage are two-thirds the source voltage for a given phase

c)

load voltage and line voltage cancel for a given phase

d)

load voltage, line voltage, and source phase voltage are all equal for a given phase

39.

Three ideal inductors are connected in star. The combination is supplied from a balanced three phase ac supply. The power factor of the circuit will be...

a)

0.5

b)

1

c)

0

d)

0.866

40.

The values of L,C and R for a circuit are 1H, 9F and 3 ohm. What is the quality factor for the circuit at resonance ?

a)

1/9

b)

1

c)

9

d)

1/3

41.

In a series LCR circuit, the quality factor can be improved by

a)

decreasing R AND L

b)

increasing C

c)

decreasing L

d)

decreasing R

42.

In a LCR circuit, the capacitor is changed from C to 4C. For the same resonant frequency , the inductance should be changed from L to

a)

4L

b)

L/4

c)

2L

d)

L/2

43.

Average power in single phase AC circuit is zero. This means circuit is

a)

pure inductive circuit

b)

series RLC circuit

c)

parallel RLC circuit

d)

pure resistance circuit

44.

The power factor is defined as

a)

cosine of the phase difference between voltage and current

b)

ratio of resistance with impedance

c)

ratio of active power with apparent power

d)

All of above

45.

Form factor is given by

a)

Vav/Vrms

b)

Vrms/Vav

c)

Vrms/Vmax

d)

Vmax/Vrms

46.

The accumulation of excess electric charge on an object is called

a)

Circuit

b)

Resistance

c)

Static electricity

d)

Electric discharge

47.

A 120 Ω load is connected across an ideal voltage source with VS = 12 V. The voltage across the load

a)

0v

b)

120v

c)

12v

d)

Cannot be Determined

48.

In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is

a)

22mA

b)

10mA

c)

12mA

d)

2mA

49.

A voltage source having an open-circuit voltage of 100 V and internal resistance of 50 ω is equivalent to a current source

a)

2 A in parallel with 50 ω

b)

2 A with 50 ω in series

c)

0.5 A in parallel with 50

d)

A in parallel with 100 ω

50.

CHARGE Q =

a)

CV

b)

VR

c)

RC

d)

I/R

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