Measurements and Instrumentation - ECE Questions and Answers

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LVDT is used to measure

displacement

pressure

temperature

any of the above

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The scale of PMMC instrument is linear.

True

False

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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.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true R is false

A is false R is true

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Absolute instruments are used in

laboratories

industries

power houses

standard laboratories

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Burden of an instrument transformer is expressed in

V-A

watt

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Which of the following devices should be used for accurate measurement of a low dc voltage?

Small range moving coil voltmeter

Dc potentiometer

Small range thermocouple voltmeter

Hot wire instrument

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If σ is standard deviation, variation is

σ - 1

σ^1.5

σ²

σ³

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An electrodynamometer instrument has the advantage of

freedom from hysteresis and eddy currents because air cored coils are used

freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material

high torque/weight ratio

low cost

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The dimensions of permittivity are

L^-3M^-1T²Q²

L^-1M^-1T²Q²

L²MT^-1Q^-1

L^-2M^-1T²Q²