A wattmeter will read zero under the following condition
A. The voltage and current are exactly in phase
B. The voltage and current have the same time periods but the voltage is sinusoidal whereas the current is a square wave
C. the voltage frequency is twice the current frequency
D. The current is dc and the voltage is sinusoidal
Answer: Option D
This Question Belongs to Electronics And Communications Engineering >> Measurement And Instrumentation
The spring material used in a spring control device should have the following property.
A. Should be nonmagnetic
B. Most be of low temperature coefficient
C. Should have low specific resistance
D. All of the above
Why is a MISC meter not recommended for DC measurement?
A. The meter is calibrated for AC and it’s error for DC would be high
B. The meter does not respond to DC signals
C. The error is high due to hysteresis effect
D. The error is high due to eddy current effect
A moving iron ammeter may be compensated for frequency errors by
A. A shunt resistance
B. A series inductance
C. Shunt capacitance
D. Series resistance
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