Measurement of Electrical Power NDA Questions

NDA Physics

Measurement of Electrical Power MCQ Questions


13.
What is reactive power measured in?
A.
Watts (W)
B.
Joules (J)
C.
Volt-amperes (VA)
D.
Volt-amperes reactive (VAR)
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ANSWER :
D. Volt-amperes reactive (VAR)
14.
Which component in an AC circuit primarily contributes to reactive power?
A.
Resistors
B.
Inductors and capacitors
C.
Transformers
D.
Diodes
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ANSWER :
B. Inductors and capacitors
15.
How can one improve the power factor in an electrical system?
A.
Adding resistors
B.
Adding capacitors or inductors
C.
Increasing voltage
D.
Reducing current
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ANSWER :
B. Adding capacitors or inductors
16.
Why is the use of a watt-hour meter advantageous in measuring energy consumption?
A.
Measures instantaneous power only
B.
Provides a cumulative measure of power consumption over time
C.
Easier to read than a wattmeter
D.
Requires no calibration
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ANSWER :
B. Provides a cumulative measure of power consumption over time
17.
How can the accuracy of power measurement in high-voltage circuits be increased?
A.
Using a low resistance shunt
B.
Using a high resistance series resistor
C.
Using potential transformers
D.
Using current transformers
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ANSWER :
D. Using current transformers
18.
In the context of electrical power, what does the term “active power” refer to?
A.
Power that does no work
B.
Power stored in the circuit
C.
Power that performs work
D.
Power dissipated as heat
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ANSWER :
C. Power that performs work