Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
Integrating instruments
Indicating instruments
Absolute instruments
Recording instruments
Indicating instruments
The spring material used in a spring control device should have the following property.
All of the above
Should be non-magnetic
Most be of low temperature co-efficient
Should have low specific resistance
All of the above
Which of the following properties a damping oil must possess ?
Should not have corrosive action upon the metal of the vane
Should be non-evaporating
Must be a good insulator
All
All
A moving-coil permanent-magnet instrument can be used as flux-meter
by using a low resistance shunt
by using a high series resistance
by eliminating the control springs
by making control springs of large moment of inertia
by eliminating the control springs
Which of the following meters are not used on D.C. circuits
Induction meters
None of the above
Commutator motor meters
Mercury motor meters
Induction meters
Which of the following is an essential part of a motor meter ?
All of the above
A braking device
An operating torque system
Revolution registering device
All of the above
Which of the following essential features is possessed by an indicating instrument ?
Damping device
All of the above
Deflecting device
Controlling device
All of the above
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
damping
deflecting
controlling
any of the above
damping
Resistances can be measured with the help of
ammeters
voltmeters
wattmeters
ohmmeters and resistance bridges
ohmmeters and resistance bridges
Induction type single phase energy meters measure electric energy in
kW
Wh
kWh
VAR
kWh
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