Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

If σ is standard deviation, variation is
A:
σ - 1
B:
σ1.5
C:
σ2
D:
σ3
Answer: C
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Which of the following devices should be used for accurate measurement of a low dc voltage?
A:
Small range moving coil voltmeter
B:
Dc potentiometer
C:
Small range thermocouple voltmeter
D:
Hot wire instrument
Answer: B
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Burden of an instrument transformer is expressed in
A:
A
B:
V-A
C:
Ω
D:
watt
Answer: B
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Assertion (A): Thermistors are commonly used to measure hot spot temperatures in electric machines.

Reason (R): Thermistor has the advantages of high temperature coefficient, small size and high speed of response.

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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The scale of PMMC instrument is linear.
A:
True
B:
False
C:
D:
Answer: A
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