Q. Consider the following statements regarding phase sensitive detector

1. The detector reads zero when phases of input signal and reference signal are different.
2. The detector acts as a linear rectifier.
3. The detector can be used as vector voltmeter.

Of the above statements which are correct?

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Q. In a Weston synchronoscope, the moving coil is connected across

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Q. The coding system generally used in digital telemetry is

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Q. The advantage of semiconductor strain gauge over resistance strain gauge is

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Q. A Q meter uses the principle of

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Q. In semiconductor strain gauge

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Q. Four terminal approach is used in measuring low resistance because it

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Q. In Weston synchronoscope the fixed coils are connected across

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Q. Which of the following is not a transducer in true sense?

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Q. In low power factor wattmeter, the pressure coil is connected

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Q. The signal to noise ratio in telemetry should be better than

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Q. Assertion (A): Electrodynamic instrument is not used as ammeter or voltmeter.

Reason (R): Electrodynamic instrument is more costly than PMMC and moving iron instrument.

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Q. Consider the following statements regarding electro-dynamometer type indicating instrument It can be used for measuring

1. Direct current
2. Alternating current
3. Direct voltage
4. Alternating voltage

Of these statements

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Q. The advantage of LVDT over inductive bridge type transducer is that

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Q. In a Weston synchronoscope the deflecting torque is zero when

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Q. Assertion (A): Megger is used to check insulation resistance of cables.

Reason (R): Insulation resistance of cables is very high.

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Q. Assertion (A): A power factor meter operates on dynamometer principle.

Reason (R): A power factor meter does not have a control spring.

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Q. Assertion (A): A radiation pyrometer is very suitable for high temperature measurement.

Reason (R): When temperature is high, a physical contact between hot body and thermometer is not desirable.

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Q. Burden of an instrument transformer is expressed in

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Q. Which of the following devices should be used for accurate measurement of a low dc voltage?

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