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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Q. LVDT is used to measure

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Q. The scale of PMMC instrument is linear.

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Q. 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.

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Q. Absolute instruments are used in

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Q. Assertion (A): The sign and magnitude of displacement can be measured by an LVDT.

Reason (R): LVDT is based on the principle of mutual inductance.

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Q. In Maxwell's bridge the unknown inductance is measured by comparing it with a standard capacitor.

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Q. Magnetic deflection sensitivity is defined as

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Q. Which of the following is active transducer?

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Q. Which is the displacement transducer with excellent sensitivity, linearity and resolution?

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