Measurement of Electrical Power NDA Questions

NDA Physics

Measurement of Electrical Power MCQ Questions


7.
What instrument is typically used to measure electric power in a circuit?
A.
Voltmeter
B.
Ammeter
C.
Wattmeter
D.
Ohmmeter
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ANSWER :
C. Wattmeter
8.
What does a power factor of 1 indicate?
A.
The circuit is purely resistive
B.
The circuit has equal reactive and resistive components
C.
The voltage and current are out of phase
D.
The circuit is purely inductive
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ANSWER :
A. The circuit is purely resistive
9.
If the resistance in a circuit is increased while maintaining a constant voltage, what happens to the power?
A.
Power increases
B.
Power decreases
C.
Power remains the same
D.
Power fluctuates
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ANSWER :
B. Power decreases
10.
In an AC circuit, what type of power does not perform any useful work?
A.
Real power
B.
Apparent power
C.
Reactive power
D.
None of the above
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ANSWER :
C. Reactive power
11.
Which power is responsible for the actual work done by electrical devices?
A.
Real power
B.
Apparent power
C.
Reactive power
D.
None of the above
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ANSWER :
A. Real power
12.

In DC circuits, which equation correctly describes the power?

A.

P = V / I

B.

P = V * I

C.

P = I2 * R

D.

P = V2 / R

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ANSWER :

B. P = V * I