In a portable instrument, the controlling torque is provided by_____________?

A. Spring
B. Gravity
C. Eddy currents
D. All of the above

In majority of instruments damping is provided by______________?

A. Fluid friction
B. Spring
C. Eddy currents
D. All of the above

The disc of an instrument using eddy current damping should be of________________?

A. Conducting and magnetic material
B. Non-conducting and magnetic material
C. Conducting and non-magnetic material
D. None of the above

The function of shunt in an ammeter is to______________?

A. By pass the current
B. Increase the sensitivity of the ammeter
C. Increase the resistance of ammeter
D. None of the above

A potentiometer may be used for_________________?

A. measurement of resistance
B. measurement of current
C. calibration of ammeter
D. calibration of voltmeter

The chemical effect of current is used in ______________?

A. D.c. ammeter hour meter
B. D.c. ammeter
C. D.c. energy meter
D. None of the above

For handling greater currents induction wattmeters are used in conjunction with______________?

A. Potential transformers
B. Current transformers
C. Power transformers
D. Either of the above

is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another_______________?

A. Tangent galvanometer
B. Meggar
C. Current transformer
D. None of the above

Induction type single phase energy meters measure electric energy in_______________?

A. Kw
B. Wh
C. Kwh
D. Var

A moving-coil permanent-magnet instrument can be used as flux-meter_____________?

A. By using a low resistance shunt
B. By using a high series resistance
C. By eliminating the control springs
D. By making control springs of large moment of inertia