Q. Assertion (A): Megger is used to check insulation resistance of cables.

Reason (R): Insulation resistance of cables is very high.

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Q. Assertion (A): A power factor meter operates on dynamometer principle.

Reason (R): A power factor meter does not have a control spring.

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Q. Assertion (A): A radiation pyrometer is very suitable for high temperature measurement.

Reason (R): When temperature is high, a physical contact between hot body and thermometer is not desirable.

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Q. Burden of an instrument transformer is expressed in

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

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Q. An electrodynamometer instrument has the advantage of

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Q. The dimensions of permittivity are

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Q. It is required to measure a low magnitude high frequency current. The proper instrument is

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Q. Bridge circuits using RTD in temperature measurement usually employ 3 lead system so as to obtain

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Q. The stator of phase shifting transformer for use in conjunction with an ac potentiometer has a

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Q. The sensitivity of a potentiometer can be increased by

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Q. Two resistances are R1 = 36 ± 5% and R2 = 75 ± 5%. If they are connected in parallel, the limiting error in percent will be

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Q. An ac bridge uses galvanometer as detector.

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Q. Consider the following statements about mutual inductances:

1. The value should remain constant under all conditions.
2. The mutual inductance should not vary with temperature.
3. The inductance should be independent of excitation.
4. They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.

Out of the above, correct statement are

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Q. For measuring current at a high frequency we should use

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Q. A moving iron instrument can be used for dc as well as ac.

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Q. Two wattmeter method of 3-phase power measurement can be used to find

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Q. The multiplier resistance and meter coil in a voltmeter are in

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Q. The adjustment of position of shading bands, in an energy meter, is done to provide

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Q. Assertion (A): CRO can be used to study waveshape accurately.

Reason (R): Input impedance of a CRO is very high.

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