Q. Assertion (A): Double Kelvin's bridge is used to measure low resistances.

Reason (R): In low resistance, the contact and lead resistances are very important.

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Q. Shaft encoder is used to measure

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Q. Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance.

Reason (R): In Hay's bridge the value of frequency supply must be known.

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Q. The device having highest photo sensitivity is

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Q. Assertion (A): The scale a PMMC ammeter is linear.

Reason (R): The deflecting torque of PMMC is proportional to current in the coil.

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Q. Assertion (A): Moving iron instrument can be used on ac or dc.

Reason (R): In a moving iron instrument deflecting torque is proportional to square of current.

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Q. A land line telemetry system is suitable for distance upto

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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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