Q. Two wattmeter method for 3 phase power measurement can be used only for

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Q. A coil resonates at 1 MHz with a resonating capacitance of 72 pF. At 500 pF, resonance is obtained with a resonating capacitor of 360 pF. The self capacitance of coil is

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Q. A peak responding ac voltmeter using a half wave rectifier has been calibrated to read 1 V for 1 V rms sine wave input. If input is 1 V dc the reading will be

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Q. For measuring inductance with high Q, we should use

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Q. A resistance strain gauge has a resistance of about

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Q. Crompton potentiometer has

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Q. Assertion (A): For best results the system of a D'Arsonval galvanometer should be slightly under damped.

Reason (R): Degree of damping affects the time taken by the instrument to come to final position.

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Q. Assertion (A): An RTD uses platinum coil.

Reason (R): Platinum is a very stable material.

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Q. Which of the following, is not a piezoelectric material?

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Q. Harmonic distortion analyser

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Q. An electrostatic voltmeter is suitable for

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Q. The flow rate of electrically conducting liquid without any suspended particle can not be measured by

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Q. While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.

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Q. The term 'Poisson's ratio' is connected with

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Q. A direct current can be measured

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Q. Consider the following galvanometers

1. D'Arsonval
2. Ballistic
3. Vibration

Which of these are permanent magnet moving coil instruments?

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Q. Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

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Q. Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

Reason (R): The time base generator develops a saw tooth voltage.

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Q. A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

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Q. The material used in RTD is

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