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EEE : Circuit Theorems and Conversions - Quiz(MCQ)
1 .
A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source is
A)
2 A
B)
4 A
C)
200 mA
D)
400 mA

Correct Answer :   2 A

2 .
A 12 mA current source has an internal resistance, RS, of 1.2 kΩ. The equivalent voltage source is
A)
7.2 V
B)
14.4 V
C)
72 mV
D)
144 V

Correct Answer :   14.4 V

3 .
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.
A)
5.62 V, 167 Ω
B)
5.62 V, 188 Ω
C)
562 mV, 167 Ω
D)
562 mV, 188 Ω

Correct Answer :   5.62 V, 167 Ω

4 .
Transistors act basically as voltage sources.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

5 .
Find RN for the circuit given.
A)
34 Ω
B)
68 Ω
C)
120 Ω
D)
154 Ω

Correct Answer :   154 Ω

6 .
What is the Thevenin equivalent (VTH and RTH) for the circuit given?
A)
6.4 V, 422 Ω
B)
6.4 V, 560 Ω
C)
6.4 V, 680 Ω
D)
30 V, 422 Ω

Correct Answer :   6.4 V, 422 Ω

7 .
Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

8 .
Find the Norton circuit, that is, IIN and RN, for the circuit given below.
A)
750 mA, 6.8 Ω
B)
750 mA, 12.8 Ω
C)
478 mA, 12.8 Ω
D)
478 mA, 6.8 Ω

Correct Answer :   478 mA, 12.8 Ω

9 .
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.
A)
4.16 V, 120 Ω
B)
4.16 V, 70 Ω
C)
41.6 V, 120 Ω
D)
41.67 V, 70 Ω

Correct Answer :   41.67 V, 70 Ω

10 .
Find the current in R2 of the given circuit, using the superposition theorem.
A)
16.6 mA
B)
16.7 mA
C)
33.3 mA
D)
50 mA

Correct Answer :   50 mA

11 .
Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

12 .
A certain voltage source has the values VS = 30 V and RS = 6 Ω. The values for an equivalent current source are
A)
5 A, 6 Ω
B)
5 A, 30 Ω
C)
30 A, 5 Ω
D)
30 A, 6 Ω

Correct Answer :   5 A, 6 Ω

13 .
A certain current source has the values IS = 4 µA and RS = 1.2 MΩ. The values for an equivalent voltage source are
A)
1 V, 1.2 MΩ
B)
4.8 µV, 1.2 MΩ
C)
4.8 V, 4.8 MΩ
D)
4.8 V, 1.2 MΩ

Correct Answer :   4.8 V, 1.2 MΩ

14 .
What is the values for an equivalent current source. When A certain voltage source has the values VS = 30 V and RS = 6 ?
A)
5 A, 30 Ω
B)
5 A, 6 Ω
C)
30 A, 6 Ω
D)
30 A, 5 Ω

Correct Answer :   5 A, 6 Ω

15 .
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)
2 mA
B)
10 mA
C)
12 mA
D)
22 mA

Correct Answer :   2 mA

16 .
An ideal current source has zero internal resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

17 .
A practical voltage source has a nonzero internal resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

18 .
An ideal voltage source has zero internal resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

19 .
A practical current source has a finite internal resistance.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

20 .
Determine IN for the circuit consisting of VS, R1, R2 and R3 shown in the given circuit.
A)
75 mA
B)
245 mA
C)
431 mA
D)
676 mA

Correct Answer :   245 mA

21 .
Find the total current through R3 in the given circuit.
A)
12.8 mA
B)
7.3 mA
C)
5.5 mA
D)
1.8 mA

Correct Answer :   1.8 mA

22 .
Find the current through R2 of the given circuit.
A)
30.7 mA
B)
74 mA
C)
104 mA
D)
134 mA

Correct Answer :   134 mA

23 .
Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?
A)
0.04 A
B)
0.24 A
C)
0.16 A
D)
0.2 A

Correct Answer :   0.16 A

24 .
A 120 Ω load is connected across an ideal voltage source with VS = 12 V. The voltage across the load is
A)
0 V
B)
12 V
C)
120 V
D)
Cannot be determined

Correct Answer :   12 V

25 .
A 120 Ω load is connected across a voltage source with VS = 12 V and RS = 8 Ω. The voltage across the load is
A)
0 V
B)
1.13 V
C)
11.25 V
D)
12 V

Correct Answer :   11.25 V

26 .
A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is
A)
2.38 W
B)
23.8 W
C)
2.38 mW
D)
238 mW

Correct Answer :   238 mW

27 .
You cannot convert a voltage source to an equivalent current source, or vice versa.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

28 .
A transistor is basically ________.
A)
power
B)
a voltage source
C)
a current amplifier
D)
None of the above

Correct Answer :   a current amplifier

29 .
An ideal current source has _______ in parallel with the source.
A)
an infinite output impedance
B)
zero internal resistance
C)
zero internal impedance
D)
None of the above

Correct Answer :   an infinite output impedance

30 .
A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 kΩ. The load current, RL, is
A)
0 A
B)
1.14 A
C)
1.2 A
D)
114 mA

Correct Answer :   1.14 A

31 .
The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

32 .
Find the current through R1 in the given circuit.
A)
0.2 A
B)
0.24 A
C)
0.16 A
D)
0.04 A

Correct Answer :   0.16 A

33 .
Referring to the given circuit, the voltage and current for the load resistor, RL, is
A)
4.50 V, 4.5 mA
B)
4.50 V, 45 mA
C)
450 mV, 45 mA
D)
450 mV, 4.5 mA

Correct Answer :   4.50 V, 4.5 mA

34 .
An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, is
A)
0 W
B)
1 W
C)
18 mW
D)
175 mW

Correct Answer :   1 W

35 .
Some circuits require more than one voltage or current source.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

36 .
Referring to the given circuit, determine VTH and RTH if a 68 Ω resistor is connected in parallel across R2 and R3.
A)
3.3 V, 68 Ω
B)
3.3 V, 148 Ω
C)
330 mV, 68 Ω
D)
330 mV, 148 Ω

Correct Answer :   3.3 V, 148 Ω

37 .
A 2 Ω RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 Ω. What is the output voltage across the load?
A)
0 V
B)
8.5 V
C)
85 V
D)
110 V

Correct Answer :   8.5 V

38 .
A 470 Ω RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 Ω. What is the output voltage across the load?
A)
0 V
B)
12 V
C)
120 V
D)
117 V

Correct Answer :   117 V

39 .
What is Norton's equivalent current?
A)
The current source present in the circuit is called as Norton's equivalent current.
B)
The voltage source present in the Norton's equivalent circuit is called as Norton's equivalent current.
C)
The current source present in the Norton's equivalent circuit is called as Norton's equivalent current.
D)
All of the above

Correct Answer :   The current source present in the Norton's equivalent circuit is called as Norton's equivalent current.

40 .
A voltage source having an open-circuit voltage of 100 V and internal resistance of 50 ω is equivalent to a current source:
A)
A in parallel with 100 ω
B)
0.5 A in parallel with 50 ω
C)
2 A with 50 ω in series
D)
2 A in parallel with 50 ω

Correct Answer :   2 A in parallel with 50 ω