Q. Assertion (A): If the resistance of shunt of an ammeter is increased, the range of ammeter is reduced.

Reason (R): If the series resistance of a voltmeter is increased, the range of voltmeter is increased.

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Q. Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

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Q. The scale of a dynamometer is linear when used as

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Q. Three phase four wire induction energy meter is used to measure

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Q. Thermistors are made of

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Q. The Y plates of a CRO are excited by a voltage 2 sin 100 t and the X plates are not connected. The display would be

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Q. Heating effect of current is used in

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Q. The coils of Drysdale polar potentiometer are wound non-inductively.

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Q. Magnetic effect of current is used in

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Q. Without a spectrum analyser, it is not possible to determine

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Q. A phase shifting transformer is used in conjunction with

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Q. In a megger the controlling torque is provided by

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Q. A 3-digit voltmeter having a resolution of 100 mV can be used to measure a maximum of

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Q. For measurement of high voltage capacitors the suitable bridge is

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Q. In a phase shifting transformer the currents in the two stator winding are in phase.

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Q. A power factor meter has

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Q. In a semiconductor strain gauge, the ohmic electrical contacts are generally made of

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Q. To measure dielectric loss you would use

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Q. Minute cracks in metals and minute faults in welded joints can be detected using

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Q. Which of these instruments has highest power consumption?

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