Q. Use of high permeability core in moving iron instrument helps in

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Q. The resistance of series field winding is a low resistance.

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Q. The torque in induction wattmeters due to

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Q. During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are

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Q. Two resistances are : R1 = 36 Ω ± 1.89 Ω and R2 = 75 Ω ± 3.75 Ω. The sum R1 + R2 along with limiting error is

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Q. An instrument of accuracy class 1 can have an error equal to

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Q. An induction wattmeter can be used for ac only.

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Q. To measure a resistance of about 8 ohms we should use

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Q. For measuring temperatures below 800°C with high accuracy, the best instrument is

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Q. Panel instruments are generally mounted vertically.

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Q. Assertion (A): Many instruments use eddy current damping.

Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them.

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Q. A generated voltage is equally dependent on three resistances R1, R2, R3 and its value is V = (R1R2)/R3. If tolerance of each resistor is 0.1%, the maximum error in voltage is

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Q. Assertion (A): A thermocouple transducer is based on Seeback effect.

Reason (R): In a thermocouple transducer used for temperature measurement, the cold junction is usually kept in ice bath.

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Q. In an Anderson bridge the unknown inductance is measured in terms of

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Q. In a Ballistic galvanometer

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Q. Which instrument needs creep compensation?

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Q. For use at 50 Hz the range of scale of vibrating reed frequency meter is

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Q. Consider the following statements about a moving iron instrument

1. It is an unpolarised instrument.
2. It has permanent magnet.
3. It has a fixed coil.
4. It has two iron vanes.

Of these statements

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Q. The two pressure coils in a single phase power factor meter of turns

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Q. Piezoelectric effect can be used to measure

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