Explore topic-wise MCQs in Electrical Engineering.

This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?%!

A. 226 mW
B. 2.26 mW
C. 4.24 mW
D. 424 mW
Answer» E.
Discussion
2.

For the circuit shown, determine ZTH for the portion of the circuit external to RL.%!

A. 66.7 ‚à †-33.7¬∞ kŒ©
B. 6.67 ‚à †-333.7¬∞ kŒ©
C. 14.4 ‚à †-56.3¬∞ kŒ©
D. 1.44 ‚à †-33.7¬∞ kŒ©
Answer» C. 14.4 ‚Äö√ ‚Ä -56.3¬¨‚àû k≈í¬©
Discussion
3.

Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.%!

A. 129 ‚à †21.4¬∞ Œ©
B. 43.7 ‚à †68.6¬∞ Œ©
C. 43.7 ‚à †21.4¬∞ Œ©
D. 12.9 ‚à †68.6¬∞ Œ©
Answer» C. 43.7 ‚Äö√ ‚Ä 21.4¬¨‚àû ≈í¬©
Discussion
4.

Referring to the given circuit, find ZTH if R is 15 kΩ and RL is 38 kΩ.%!

A. 89.82 ‚à †-51.3¬∞ kŒ©
B. 19.2 ‚à †-38.3¬∞ kŒ©
C. 9.38 ‚à †-51.3¬∞ kŒ©
D. 180 ‚à †-38.3¬∞ kŒ©
Answer» D. 180 ‚Äö√ ‚Ä -38.3¬¨‚àû k≈í¬©
Discussion
5.

In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.%!

A. True
B. False
Answer» B. False
Discussion
6.

A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.%!

A. True
B. False
Answer» C.
Discussion
7.

Referring to the given circuit, L%!

A. Must be in parallel with RL
B. Must be placed in parallel with VS
C. Must have a reactance equal to XC
D. Has no effect on the result
Answer» E.
Discussion
8.

An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit that it replaces.%!

A. True
B. False
Answer» B. False
Discussion
9.

The superposition theorem is useful for the analysis of single-source circuits.%!

A. True
B. False
Answer» C.
Discussion
10.

Determine VTH for the circuit external to RL in the given figure.%!

A. 135 ‚à †63.4¬∞ V
B. 13.5 ‚à †63.4¬∞ V
C. 13.5 ‚à †0¬∞ V
D. 135 ‚à †0¬∞ V
Answer» C. 13.5 ‚Äö√ ‚Ä 0¬¨‚àû V
Discussion
11.

Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.%!

A. True
B. False
Answer» B. False
Discussion
12.

In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.%!

A. True
B. False
Answer» B. False
Discussion
13.

For the given circuit, find VTH for the circuit external to RL.%!

A. 4.69 ‚à †51.3¬∞ V
B. 4.69 ‚à †38.7¬∞ V
C. 469 ‚à †38.7¬∞ mV
D. 6 ‚à †0¬∞ V
Answer» C. 469 ‚Äö√ ‚Ä 38.7¬¨‚àû mV
Discussion
14.

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant%!

A. Is zero
B. Is the sum of the two currents
C. Is the difference between the two currents
D. Cannot be determined
Answer» C. Is the difference between the two currents
Discussion
15.

The Thevenin equivalent voltage is%!

A. Equal to the source voltage
B. The same as the load voltage
C. The open circuit voltage
D. None of the above
Answer» D. None of the above
Discussion
16.

Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.%!

A. True
B. False
Answer» C.
Discussion
17.

Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.%!

A. True
B. False
Answer» C.
Discussion
18.

The Norton equivalent current is%!

A. The current through the load
B. The open-current from the source
C. The short circuit current
D. None of the above
Answer» D. None of the above
Discussion
19.

In applying the superposition theorem,%!

A. The sources are considered one at a time with all others replaced by their internal impedance
B. All sources are considered independently
C. All sources are considered simultaneously
D. The sources are considered one at a time with all others replaced by their internal resistance
Answer» B. All sources are considered independently
Discussion
20.

One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.%!

A. True
B. False
Answer» C.
Discussion
21.

In order to get maximum power transfer from a capacitive source, the load must%!

A. Have a capacitive reactance equal to circuit resistance
B. Have an impedance that is the complex conjugate of the source impedance
C. Be as capacitive as it is inductive
D. None of the above
Answer» C. Be as capacitive as it is inductive
Discussion
22.

The two basic components of a Thevenin equivalent ac circuit are%!

A. The equivalent voltage source and the equivalent series impedance
B. The equivalent voltage source and the equivalent series resistance
C. The equivalent voltage source and the equivalent parallel impedance
D. The equivalent voltage source and the equivalent parallel resistance
Answer» B. The equivalent voltage source and the equivalent series resistance
Discussion
23.

The superposition theorem is useful for circuit analysis only in ac circuits.%!

A. True
B. False
Answer» C.
Discussion
24.

Determine VTH when R1 is 180 Ω and XL is 90 Ω.%!

A. 135‚à †63.4¬∞ V
B. 13.5‚à †63.4¬∞ V
C. 12.2‚à †0¬∞ V
D. 122‚à †0¬∞ V
Answer» C. 12.2‚Äö√ ‚Ä 0¬¨‚àû V
Discussion
25.

Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.%!

A. 1,027 Hz
B. 10,270 Hz
C. 6,330 Hz
D. 63,330 Hz
Answer» B. 10,270 Hz
Discussion
26.

Referring to the given circuit, find ZTH if VS is 180° V.%!

A. 9.82 ‚à †-51.3¬∞ kŒ©
B. 9.38 ‚à †-51.3¬∞ kŒ©
C. 180 ‚à †-38.3¬∞ kŒ©
D. 19.2 ‚à †-38.3¬∞ kŒ©
Answer» C. 180 ‚Äö√ ‚Ä -38.3¬¨‚àû k≈í¬©
Discussion
27.

For the circuit given, determine the Thevenin voltage as seen by RL.%!

A. 0.574 ‚à †16.7¬∞ V
B. 5.74 ‚à †16.7¬∞ V
C. 0.574 ‚à †-16.7¬∞ V
D. 5.74 ‚à †-16.7¬∞ V
Answer» E.
Discussion
28.

Referring to the given circuit, what is VTH if VS = 12 ‚à †0¬∞ V?%!

A. 4.69 ‚à †38.7¬∞ V
B. 9.38 ‚à †38.7¬∞ V
C. 12 ‚à †0¬∞ V
D. 6 ‚à †0¬∞ V
Answer» C. 12 ‚Äö√ ‚Ä 0¬¨‚àû V
Discussion
29.

Referring to the given circuit, determine ZTH as seen by RL.%!

A. 1444 ‚à †-48.5¬∞ Œ©
B. 4176 ‚à †-73.3¬∞ Œ©
C. 956 ‚à †-48.5¬∞ Œ©
D. 1444 ‚à †-73.3¬∞ Œ©
Answer» B. 4176 ‚Äö√ ‚Ä -73.3¬¨‚àû ≈í¬©
Discussion
30.

*$_Referring to the given circuit, determine ZTH as seen by RL.?

A. 1444 ‚à †-48.5¬∞ Œ©
B. 4176 ‚à †-73.3¬∞ Œ©
C. 956 ‚à †-48.5¬∞ Œ©
D. 1444 ‚à †-73.3¬∞ Œ©
Answer» B. 4176 ‚Äö√ ‚Ä -73.3¬¨‚àû ≈í¬©
Discussion
31.

*/*_Referring to the given figure, determine ZTH as seen by RL if R1 is changed to 3.3 kΩ.?

A. 1488 ‚à †-70.7¬∞ Œ©
B. 3859 ‚à †-31.2¬∞ Œ©
C. 5180 ‚à †-50.5¬∞ Œ©
D. 1828 ‚à †-50.2¬∞ Œ©
Answer» E.
Discussion
32.

%_Referring to the given figure, determine ZTH as seen by RL if R1 is changed to 3.3 kΩ._%

A. 1488 ‚à †-70.7¬∞ Œ©
B. 3859 ‚à †-31.2¬∞ Œ©
C. 5180 ‚à †-50.5¬∞ Œ©
D. 1828 ‚à †-50.2¬∞ Œ©
Answer» E.
Discussion
33.

__Determine VTH if R1 is changed to 3.3 kΩ.__

A. 0.574 ‚à †16.7¬∞ V
B. 4.63 ‚à †16.7¬∞ V
C. 4.63 ‚à †39.5¬∞ V
D. 0.463 ‚à †39.5¬∞ V
Answer» D. 0.463 ‚Äö√ ‚Ä 39.5¬¨‚àû V
Discussion
34.

Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω?$?

A. 225 ‚à †12.1¬∞ Œ©
B. 225 ‚à †77.9¬∞ Œ©
C. 46 ‚à †77.9¬∞ Œ©
D. 46 ‚à †12.1¬∞ Œ©
Answer» D. 46 ‚Äö√ ‚Ä 12.1¬¨‚àû ≈í¬©
Discussion
35.

Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω??

A. 225 ‚à †12.1¬∞ Œ©
B. 225 ‚à †77.9¬∞ Œ©
C. 46 ‚à †77.9¬∞ Œ©
D. 46 ‚à †12.1¬∞ Œ©
Answer» D. 46 ‚Äö√ ‚Ä 12.1¬¨‚àû ≈í¬©
Discussion
36.

Norton's theorem gives

A. An equivalent current source in parallel with an equivalent impedance
B. An equivalent current source in series with an equivalent impedance
C. An equivalent voltage source in parallel with an equivalent impedance
D. An equivalent voltage source in series with an equivalent impedance
Answer» B. An equivalent current source in series with an equivalent impedance
Discussion