Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Two wattmeter method of 3-phase power measurement can be used to find
A:
total active power
B:
total active power and power factor
C:
total active power and reactive power
D:
total active power, power factor, apparent power, and reactive power
Answer: D
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A moving iron instrument can be used for dc as well as ac.
A:
True
B:
False
C:
D:
Answer: A
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For measuring current at a high frequency we should use
A:
moving iron instrument
B:
electrostatic instrument
C:
thermocouple instrument
D:
moving coil instrument
Answer: C
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Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.

Reason (R): The function of grid in an electronic tube is to control the number of electrons.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true R is false
D:
A is false R is true
Answer: A
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Which of the following can be used for measuring capacitance?
A:
De sauty bridge
B:
Maxwell's bridge
C:
Anderson bridge
D:
Hay's bridge
Answer: A
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