34 + Mcqs in Circuit Theorems And Conversions in Electrical Engineering Page 1 McqOptions

1.	An ideal voltage source has zero internal resistance.%!
A.	True
B.	False
Answer» B. False

Discussion

2.	A practical voltage source has a nonzero internal resistance.%!
A.	True
B.	False
Answer» B. False

Discussion

3.	An ideal current source has zero internal resistance.%!
A.	True
B.	False
Answer» C.

Discussion

4.	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.	22 mA
B.	12 mA
C.	10 mA
D.	2 mA
Answer» E.

Discussion

5.	Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.%!
A.	562 mV, 167 ≈í¬©
B.	5.62 V, 167 ≈í¬©
C.	5.62 V, 188 ≈í¬©
D.	562 mV, 188 ≈í¬©
Answer» C. 5.62 V, 188 ≈í¬©

Discussion

6.	You cannot convert a voltage source to an equivalent current source, or vice versa.%!
A.	True
B.	False
Answer» C.

Discussion

7.	A 12 mA current source has an internal resistance, RS, of 1.2 k≈í¬©. The equivalent voltage source is%!
A.	144 V
B.	14.4 V
C.	7.2 V
D.	72 mV
Answer» C. 7.2 V

Discussion

8.	A certain current source has the values IS = 4 ¬¨¬µA and RS = 1.2 MO. The values for an equivalent voltage source are%!
A.	4.8 ¬¨¬µV, 1.2 M≈í¬©
B.	1 V, 1.2 M≈í¬©
C.	4.8 V, 4.8 M≈í¬©
D.	4.8 V, 1.2 M≈í¬©
Answer» E.

Discussion

9.	A 120 V voltage source has a source resistance, RS, of 60 ≈í¬©. The equivalent current source is%!
A.	2 A
B.	4 A
C.	200 mA
D.	400 mA
Answer» B. 4 A

Discussion

10.	A certain voltage source has the values VS = 30 V and RS = 6 ≈í¬©. The values for an equivalent current source are%!
A.	5 A, 6 ≈í¬©
B.	30 A, 6 ≈í¬©
C.	5 A, 30 ≈í¬©
D.	30 A, 5 ≈í¬©
Answer» B. 30 A, 6 ≈í¬©

Discussion

11.	The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.%!
A.	True
B.	False
Answer» C.

Discussion

12.	Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.%!
A.	True
B.	False
Answer» C.

Discussion

13.	A 680 ≈í¬© load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 k≈í¬©. The load current, RL, is%!
A.	0 A
B.	1.2 A
C.	114 mA
D.	1.14 A
Answer» E.

Discussion

14.	Find the current in R2 of the given circuit, using the superposition theorem.%!
A.	16.7 mA
B.	33.3 mA
C.	50 mA
D.	16.6 mA
Answer» D. 16.6 mA

Discussion

15.	A practical current source has a finite internal resistance.%!
A.	True
B.	False
Answer» B. False

Discussion

16.	A 120 ≈í¬© 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
Answer» C. 120 V

Discussion

17.	Referring to the given circuit, determine VTH and RTH if a 68 ≈í¬© resistor is connected in parallel across R2 and R3.%!
A.	3.3 V, 148 ≈í¬©
B.	330 mV, 148 ≈í¬©
C.	3.3 V, 68 ≈í¬©
D.	330 mV, 68 ≈í¬©
Answer» B. 330 mV, 148 ≈í¬©

Discussion

18.	Find the total current through R3 in the given circuit.%!
A.	7.3 mA
B.	5.5 mA
C.	12.8 mA
D.	1.8 mA
Answer» E.

Discussion

19.	Referring to circuit given, if R1 is changed to a 68 ≈í¬© resistor, what will be the current through it?%!
A.	0.16 A
B.	0.24 A
C.	0.2 A
D.	0.04 A
Answer» B. 0.24 A

Discussion

20.	Some circuits require more than one voltage or current source.%!
A.	True
B.	False
Answer» B. False

Discussion

21.	Determine IN for the circuit consisting of VS, R1, R2, and R3 shown in the given circuit.%!
A.	676 mA
B.	245 mA
C.	431 mA
D.	75 mA
Answer» C. 431 mA

Discussion

22.	Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.%!
A.	4.16 V, 120 ≈í¬©
B.	41.6 V, 120 ≈í¬©
C.	4.16 V, 70 ≈í¬©
D.	41.67 V, 70 ≈í¬©
Answer» E.

Discussion

23.	An 18 V source has an internal resistance of 70 ≈í¬©. If a load resistance of 33 ≈í¬© is connected to the voltage source, the load power, PL, is%!
A.	0 W
B.	1 W
C.	175 mW
D.	18 mW
Answer» C. 175 mW

Discussion

24.	What is the Thevenin equivalent (VTH and RTH) for the circuit given?%!
A.	6.4 V, 422 ≈í¬©
B.	6.4 V, 560 ≈í¬©
C.	6.4 V, 680 ≈í¬©
D.	30 V, 422 ≈í¬©
Answer» B. 6.4 V, 560 ≈í¬©

Discussion

25.	Find the Norton circuit, that is, IIN and RN, for the circuit given below.%!
A.	478 mA, 12.8 ≈í¬©
B.	750 mA, 12.8 ≈í¬©
C.	478 mA, 6.8 ≈í¬©
D.	750 mA, 6.8 ≈í¬©
Answer» B. 750 mA, 12.8 ≈í¬©

Discussion

26.	A 12 V source has an internal resistance of 90 ≈í¬©. If a load resistance of 20 ≈í¬© is connected to the voltage source, the load power, PL, is%!
A.	2.38 mW
B.	2.38 W
C.	238 mW
D.	23.8 W
Answer» D. 23.8 W

Discussion

27.	Find RN for the circuit given.%!
A.	34 ≈í¬©
B.	68 ≈í¬©
C.	120 ≈í¬©
D.	154 ≈í¬©
Answer» E.

Discussion

28.	Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.%!
A.	True
B.	False
Answer» B. False

Discussion

29.	A 120 ≈í¬© load is connected across a voltage source with VS = 12 V and RS = 8 ≈í¬©. The voltage across the load is%!
A.	11.25 V
B.	0 V
C.	12 V
D.	1.13 V
Answer» B. 0 V

Discussion

30.	Transistors act basically as voltage sources.%!
A.	True
B.	False
Answer» C.

Discussion

31.	/_A 470 ≈í¬© RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 ≈í¬©. What is the output voltage across the load??
A.	120 V
B.	0 V
C.	117 V
D.	12 V
Answer» D. 12 V

Discussion

32.	_ A 2 ≈í¬© RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 ≈í¬©. What is the output voltage across the load?$?
A.	8.5 V
B.	85 V
C.	0 V
D.	110 V
Answer» B. 85 V

Discussion

33.	_Referring to the given circuit, the voltage and current for the load resistor, RL, is$?
A.	450 mV, 4.5 mA
B.	4.50 V, 45 mA
C.	4.50 V, 4.5 mA
D.	450 mV, 45 mA
Answer» D. 450 mV, 45 mA

Discussion

34.	Find the current through R2 of the given circuit.
A.	30.7 mA
B.	104 mA
C.	74 mA
D.	134 mA
Answer» E.

Discussion

Explore topic-wise MCQs in Electrical Engineering.

An ideal voltage source has zero internal resistance.%!

A practical voltage source has a nonzero internal resistance.%!

An ideal current source has zero internal resistance.%!

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%!

Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.%!

You cannot convert a voltage source to an equivalent current source, or vice versa.%!

A 12 mA current source has an internal resistance, RS, of 1.2 k≈í¬©. The equivalent voltage source is%!

A certain current source has the values IS = 4 ¬¨¬µA and RS = 1.2 MO. The values for an equivalent voltage source are%!

A 120 V voltage source has a source resistance, RS, of 60 ≈í¬©. The equivalent current source is%!

A certain voltage source has the values VS = 30 V and RS = 6 ≈í¬©. The values for an equivalent current source are%!

The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.%!

Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.%!

A 680 ≈í¬© load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 k≈í¬©. The load current, RL, is%!

Find the current in R2 of the given circuit, using the superposition theorem.%!

A practical current source has a finite internal resistance.%!

A 120 ≈í¬© load is connected across an ideal voltage source with VS = 12 V. The voltage across the load is%!

Referring to the given circuit, determine VTH and RTH if a 68 ≈í¬© resistor is connected in parallel across R2 and R3.%!

Find the total current through R3 in the given circuit.%!

Referring to circuit given, if R1 is changed to a 68 ≈í¬© resistor, what will be the current through it?%!

Some circuits require more than one voltage or current source.%!

Determine IN for the circuit consisting of VS, R1, R2, and R3 shown in the given circuit.%!

Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.%!

An 18 V source has an internal resistance of 70 ≈í¬©. If a load resistance of 33 ≈í¬© is connected to the voltage source, the load power, PL, is%!

What is the Thevenin equivalent (VTH and RTH) for the circuit given?%!

Find the Norton circuit, that is, IIN and RN, for the circuit given below.%!

A 12 V source has an internal resistance of 90 ≈í¬©. If a load resistance of 20 ≈í¬© is connected to the voltage source, the load power, PL, is%!

Find RN for the circuit given.%!

Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.%!

A 120 ≈í¬© load is connected across a voltage source with VS = 12 V and RS = 8 ≈í¬©. The voltage across the load is%!

Transistors act basically as voltage sources.%!

*/*_A 470 ≈í¬© RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 ≈í¬©. What is the output voltage across the load??

_ A 2 ≈í¬© RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 ≈í¬©. What is the output voltage across the load?$?

_Referring to the given circuit, the voltage and current for the load resistor, RL, is$?

Find the current through R2 of the given circuit.

/_A 470 ≈í¬© RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 ≈í¬©. What is the output voltage across the load??