Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

The pointer of an indicating instrument should be
A:
very light
B:
very heavy
C:
neither heavy nor light
D:
heavy
Answer: A
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Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.

Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel.

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: B
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The most serious problems in ac bridge measurement is
A:
eddy currents
B:
leakage current
C:
residual magnetism
D:
stray fields
Answer: D
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A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is
A:
0.001
B:
1000
C:
2 digit
D:
1 mV
Answer: D
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Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.

Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.

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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