Measurement of Electrical Power NDA Questions

NDA Physics

Measurement of Electrical Power MCQ Questions


1.
What is the unit of electric power?
A.
Joule (J)
B.
Coulomb (C)
C.
Watt (W)
D.
Volt (V)
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ANSWER :
C. Watt (W)
2.
Electrical power in a circuit is the product of which two quantities?
A.
Resistance and Current
B.
Voltage and Resistance
C.
Resistance and Power
D.
Voltage and Resistance
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ANSWER :
B. Voltage and Resistance
3.

What is the formula for calculating power in terms of resistance and voltage?

A.

P = V / R

B.

P = V2 / R

C.

P = V * I

D.

P = I2 * R

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ANSWER :

B. P = V2 / R

4.
In an AC circuit, what does the term 'apparent power' refer to?
A.
The power consumed by resistive loads only
B.
The product of RMS voltage and RMS current
C.
The power that does actual work
D.
The product of voltage and power factor
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ANSWER :
B. The product of RMS voltage and RMS current
5.
How is real power different from apparent power in AC circuits?
A.
Real power is always higher than apparent power
B.
Real power includes reactive power
C.
Real power is the actual power consumed, calculated as P = Vrms * Irms * cos(θ)
D.
Real power is the power lost as heat
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ANSWER :
C. Real power is the actual power consumed, calculated as P = Vrms * Irms * cos(θ)
6.
What is the power factor in an electrical circuit?
A.
The ratio of voltage to current
B.
The ratio of real power to apparent power
C.
The product of voltage and current
D.
The phase difference between voltage and current
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ANSWER :
B. The ratio of real power to apparent power