For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
A. One of the wattmeters will read zero
B. Both give the same readings
C. One of the wattmeter connections will have to be reversed
D. Pressure coil of the wattmeter will become ineffective.
Answer: Option C
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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