Q.1:
Which of the following properties a damping oil must possess ??
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?
Q.2:
Which of the following essential features is possessed by an indicating instrument ?U
A.
Deflecting device
B.
Controlling device
C.
Damping device
D.All of the above
Q.3:
According to application, instruments are classified as_____________?E
A.
switch board
B.
portable
C.both and
D.
moving coil
Q.4:
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
Q.5:
A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
A.
deflecting
B.
controlling
C.damping
D.
any of the above
Q.6:
Which of the following devices may be used for extending the range of instruments ?S
A.
Shunts
B.
Multipliers
C.
Current transformers
D.
Potential transformers
Q.7:
Which of the following essential features is possessed by an indicating instrument?S
A.
Deflecting device
B.
Controlling device
C.
Damping device
D.All of the above
Q.8:
A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?e
A.ammeter
B.
voltmeter
C.
flux-meter
D.
ballistic galvanometer
Q.9:
The spring material used in a spring control device should have the following property?W
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"
Q.10:
Which of the following are integrating instruments ?4