A. Must be a good insulator
B. Should be non-evaporating
C. Should not have corrosive action upon the metal of the vane
D. The viscosity of the oil should not change with the temperature
E. All of the above
Related Mcqs:
- 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 - Damping of the Ballistic galvanometer is made small to_______________?
A. get first deflection large
B. make the system oscillatory
C. make the system critically damped
D. get minimum overshoot - In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?
A. unity
B. 0.5
C. 0.3
D. zero - Which of the following devices may be used for extending the range of instruments ?
A. Shunts
B. Multipliers
C. Current transformers
D. Potential transformers
E. All of the above - Which of the following essential features is possessed by an indicating instrument?
A. Deflecting device
B. Controlling device
C. Damping device
D. All of the above - The spring material used in a spring control device should have the following property?
A. Should be non-magnetic
B. Most be of low temperature co-efficient
C. Should have low specific resistance
D. Should not be subjected to fatigue
E. All of the above - Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
A. Absolute instruments
B. Indicating instruments
C. Recording instruments
D. Integrating instruments - Which of the following is an essential part of a motor meter ?
A. An operating torque system
B. A braking device
C. Revolution registering device
D. All of the above - Which of the following is measured by using a vector voltmeter ?
A. Amplifier gain and phase shift
B. Filler transfer functions
C. Complex insersion loss
D. All of the above
