Q. It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a

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Q. An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be

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Q. A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be

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Q. In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected

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Q. Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?

1. One voltmeter, one ammeter
2. Two voltmeters, two ammeter
3. Three voltmeters
4. Three ammeters

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Q. For measurement of surface temperature of solids the elements of RTD is usually in the shape of

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Q. As per BIS, the number of accuracy classes of instrument is

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Q. In most of instruments, the controlling torque is provided by

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Q. A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is

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Q. DC ampere hour meter is an indicating instrument.

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Q. The accuracy of measurement by ohmmeter is very good.

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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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