Q. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

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Q. A temperature sensistive transducer is subjected to sudden temperature change. It takes 10 seconds for transducer to reach equilibrium condition (five times time constant). The time taken to reach half of temperature difference will be

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Q. The most commonly used moving iron instruments are

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Q. A moving iron instrument can be used for

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Q. Two voltmeters are each 0-300 V range. Their internal resistances are 10 kΩ and 20 kΩ They are connected is series and a voltage of 400 V is applied. Their readings respectively will be

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Q. A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage

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Q. In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because

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Q. Hay's bridge is suitable for inductances having low L/R ratio.

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Q. Moving iron instrument can be used for ac only.

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Q. In electronic voltmeters the measuring device is a

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Q. An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.

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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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