A galvanometer has
Air friction damping
Fluid friction damping
Spring coil damping
Eddy current damping
Answer : D
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1) Why is a MISC meter not recommended for DC measurement?
The meter is calibrated for AC and it’s error for DC would be high
The meter does not respond to DC signals
The error is high due to hysteresis effect
The error is high due to eddy current effect
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2) A galvanometer has
3) One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
4) The spring material used in a spring control device should have the following property.
Should be nonmagnetic
Most be of low temperature coefficient
Should have low specific resistance
All of the above
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5) For handling greater currents induction watt-meters are used in conjunction with
