Explore topic-wise MCQs in Electrical Engineering.

This section includes 27 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.

Power rating is related to resistance value.~!

A. True
B. False
Answer» C.
Discussion
2.

The power rating of a resistor determines the minimum power that it can handle safely.~!

A. True
B. False
Answer» C.
Discussion
3.

A resistor normally opens when it burns out.~!

A. True
B. False
Answer» B. False
Discussion
4.

The watt is the unit of power.~!

A. True
B. False
Answer» B. False
Discussion
5.

A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is%!

A. 0.58 Ah
B. 2.1 Ah
C. 21 Ah
D. 58 Ah
Answer» D. 58 Ah
Discussion
6.

Energy is equal to power multiplied by voltage.%!

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

The joule is a unit of energy.%!

A. True
B. False
Answer» B. False
Discussion
8.

In 40 kW, there are%!

A. 0.4 mW
B. 40,000 W
C. 400 W
D. 5,000 W
Answer» C. 400 W
Discussion
9.

A half-watt is equal to how many milliwatts?%!

A. 5,000 mW
B. 5 mW
C. 500 mW
D. 50 mW
Answer» D. 50 mW
Discussion
10.

Energy equals power multiplied by time.%!

A. True
B. False
Answer» B. False
Discussion
11.

A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least%!

A. 4.8 W
B. 150 mW
C. 15 mW
D. 480 mW
Answer» C. 15 mW
Discussion
12.

A battery is one type of power supply that converts chemical energy into electrical energy.%!

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

How many watt-hours represent 65 W used for 18 h?%!

A. 11.7 Wh
B. 1,170 Wh
C. 11,700 Wh
D. 117,000 Wh
Answer» C. 11,700 Wh
Discussion
14.

If it takes 400 ms to use 12,000 J of energy, the power is%!

A. 30 kW
B. 30 W
C. 3 W
D. 300 kW
Answer» B. 30 W
Discussion
15.

A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?%!

A. 33 Ω
B. 330 Ω
C. Both resistors
D. Neither resistor
Answer» E.
Discussion
16.

For 12 V and 40 mA, the power is%!

A. 480 mW
B. 0.480 W
C. 480,000 µW
D. All of the above
Answer» E.
Discussion
17.

A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?%!

A. 938 Wh
B. 0.938 Wh
C. 56.25 Wh
D. 5.6 Wh
Answer» C. 56.25 Wh
Discussion
18.

A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is%!

A. 132 mW
B. 13.2 mW
C. 22.6 mW
D. 226 mW
Answer» B. 13.2 mW
Discussion
19.

If you used 400 W of power for 30 h, you have used%!

A. 1.3 kWh
B. 13.3 kWh
C. 1.2 kWh
D. 12 kWh
Answer» E.
Discussion
20.

The capacity of a battery is measured in milli-amperes.%!

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

Three hundred joules of energy are consumed in 15 s. The power is%!

A. 2,000 W
B. 2 W
C. 20 W
D. 200 W
Answer» D. 200 W
Discussion
22.

A 220 Ω resistor dissipates 3 W. The voltage is%!

A. 73.3 V
B. 2.5 V
C. 25.7 V
D. 257 V
Answer» D. 257 V
Discussion
23.

A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?%!

A. 1 h
B. 200 h
C. 2,000 h
D. 10 h
Answer» D. 10 h
Discussion
24.

In 0.025 W, there are%!

A. 25 kW
B. 0.00025 mW
C. 2,500 µW
D. 25 mW
Answer» E.
Discussion
25.

*/*_When the current through a 12 kΩ resistor is 8 mA, the power is?

A. 7.68 mW
B. 768 mW
C. 7.68 W
D. 76.8 W
Answer» C. 7.68 W
Discussion
26.

_ A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?$?

A. 20.16 kWh
B. 201.6 kWh
C. 2.01 kWh
D. 8.4 kWh
Answer» C. 2.01 kWh
Discussion
27.

A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately$?

A. 120 V
B. 1.2 V
C. 12 V
D. 6 V
Answer» D. 6 V
Discussion