1) 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?
2) 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![]()
Answer : D Discuss
3) 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![]()
Answer : C Discuss
4) A moving iron ammeter may be compensated for frequency errors by
5) Which of the following meters has a linear scale?
6) For handling greater currents induction watt-meters are used in conjunction with
Potential transformers![]()
Current transformers![]()
Power transformers![]()
Either of the above![]()
Answer : B Discuss
7) When using ohmmeter, applied voltage is to be disconnected from the circuit because
Voltage source will increase resistance![]()
Current will decrease resistance![]()
The ohmmeter has its own internal battery![]()
None of the above![]()
Answer : C Discuss
8) A 10MHz CRO has
5MHz sweep![]()
10MHz vertical oscillator![]()
10MHz horizontal oscillator![]()
10MHz supply frequency![]()
Answer : C Discuss
9) A CRO can display
10) A galvanometer has
Air friction damping![]()
Fluid friction damping![]()
Spring coil damping![]()
Eddy current damping![]()
Answer : D Discuss