Q. Which of the following, is not a piezoelectric material?

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Q. Harmonic distortion analyser

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Q. An electrostatic voltmeter is suitable for

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Q. The flow rate of electrically conducting liquid without any suspended particle can not be measured by

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Q. While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.

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Q. The term 'Poisson's ratio' is connected with

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Q. A direct current can be measured

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Q. Consider the following galvanometers

1. D'Arsonval
2. Ballistic
3. Vibration

Which of these are permanent magnet moving coil instruments?

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Q. Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

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Q. Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

Reason (R): The time base generator develops a saw tooth voltage.

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Q. A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

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Q. The material used in RTD is

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Q. Basically a potentiometer is a device for

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Q. It is required to measure the true open circuit emf of a battery. The best device is

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Q. If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be

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Q. Measurement of non-electrical quantity involves the following subsystems

1. Amplifier block
2. Display block
3. Instrumentation block
4. Transducer block

The correct sequence of these blocks is

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Q. An oscilloscope has an input impedance consisting of 1 MΩ and 20 pF is parallel. A high impedance probe connected to input of this oscilloscope has a 10 MΩ series resistance. This 10 MΩ series resistance

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Q. Which of the following is used as detector in audio frequency ac bridges?

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Q. Assertion (A): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.

Reason (R): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form.

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