Q. In an ac single phase energy meter, the potential coil is put on

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Q. The chemical effect of current is used in

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Q. The switch board instruments

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Q. Radiation pyrometer is used to measure temperature in the range of

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Q. The electromagnets of an induction wattmeter

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Q. In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

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Q. In a CRO, the time base signal is applied to

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Q. Schering bridge operates at a high voltage of about 10 kV.

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Q. Which of these instrument does not have a control spring?

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Q. In Weston frequency meter, the magnetic axes of the two fixed coils are

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Q. Which one of the following is true?

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Q. A single phase energy meter operates on induction principle.

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Q. The accuracy of measurement using CRO is about

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Q. The channel required for FM telemetry is

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Q. Assertion (A): Absolute instruments are used in standard laboratories.

Reason (R): Absolute instruments do not require calibration.

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Q. Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.

Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.

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Q. A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is

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Q. The most serious problems in ac bridge measurement is

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Q. Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.

Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel.

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Q. The pointer of an indicating instrument should be

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