Which of the following are integrating instruments ?
A. Ammeters
B. Voltmeters
C. Wattmeters
D. Ampere-hour and watt-hour meters
Measurement and Instrumentation
The spring material used in a spring control device should have the following property?
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
A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?
A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?
A. ammeter
B. voltmeter
C. flux-meter
D. ballistic galvanometer
Which of the following essential features is possessed by an indicating instrument?
Which of the following essential features is possessed by an indicating instrument?
A. Deflecting device
B. Controlling device
C. Damg device
D. All of the above
Which of the following devices may be used for extending the range of instruments ?
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
A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
A. deflecting
B. controlling
C. damg
D. any 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 ?
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
According to application, instruments are classified as_____________?
According to application, instruments are classified as_____________?
A. switch board
B. portable
C. both A. and B.
D. moving coil
E. moving iron
F. both D. and E.
Which of the following essential features is possessed by an indicating instrument ?
Which of the following essential features is possessed by an indicating instrument ?
A. Deflecting device
B. Controlling device
C. Damg device
D. All of the above
Which of the following properties a damping oil must possess ?
Which of the following properties a damg 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
E. All of the above