Q. Which of the following are needed both for protection and metering?

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Q. A digital frequency counter can be converted to DVM by addition of a suitable

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Q. A dynamometer wattmeter is connected in ac circuit. The reading will be

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Q. The speed transducer using a drag cup rotor has the main advantage of

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Q. A voltmeter using thermocouples measures

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Q. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?

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Q. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?

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Q. In a thermocouple temperature transducer, the output voltage is usually measured by

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Q. A moving iron instrument gives correct reading when used at

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Q. Induction wattmeter can be used in

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Q. A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is

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Q. Consider the following Statements regarding resistance strain gauge

1. The gauge factor is in the range of 2 to 5.
2. The resistance changes due to change in specific resistance with strain.
3. The resistance increases with increase in temperature.

Of the above statements, which are correct?

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Q. PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is

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Q. A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be

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Q. When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is

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Q. Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)

1. open Kb
2. close Kg
3. close Kb
4. open Kg

The correct sequence of operations is

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Q. Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than

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Q. A 24 mm long conductor has a resistance of 128 Ω. The change in resistance is 13.3 Ω and change in length is 1.6 mm under tension. The gauge factor is

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Q. Measuring of unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when

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Q. In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz. It must be sampled at a rate of

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