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Measurements and Instrumentation

1.

Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?

Answer: C

Resistance of voltmeter should be very high as compared to 20 kΩ.

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2.

In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. The value of ΔR will be

Answer: D

.

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3.

It is required to measure angular position. Out of the transducers

1.Circular potentiometer

2.LVDT

3.E pick up

4.Synchro

The proper devices are

Answer: D

LVDT and E pickup are suitable for linear displacement.

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4.

A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

Answer: A

 .

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5.

To increase Q factor of a coil, the wire should be

Answer: C

Q is high if resistance is low. Therefore, wire should be thick.

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6.

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

Answer: B

Wattmeter measures average power over a cycle.

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7.

In which of the transformer is the secondary nearly short circuited under normal operating conditions?

Answer: A

CT is operated with secondary short-circuited otherwise a high emf would be induced across secondary.

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Answer: A

Impulse is unidirectional (either positive or negative).

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9.

The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X-plate input is 2 sin ωt, the Y-plate input is

Answer: B

When signals to X and Y plates are in phase, the display is a straight line inclined at 45°.

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10.

In a ballistic galvanometer, a charge of 100 μC gives a first swing of 25°. The charge required to cause first swing of 50° is

Answer: B

swing is proportional to charge.

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