Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be
A:
50 mV
B:
5 mV
C:
0.1 mV
D:
zero
Answer: D

Output of first op-amp is -2V, -V2.

Therefore, .

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A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is
A:
1800 per second
B:
3600 per second
C:
4800 per second
D:
5600 per second
Answer: B

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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 backward direction. A moving coil ammeter is also connected in the circuit. The reading of ammeter will be
A:
10 A
B:
5 A
C:
3.185 A
D:
14.14 A
Answer: C

Moving coil instrument indicates average value

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The volt ratio box is basically a
A:
potential divider
B:
current transformer
C:
a high resistance voltmeter
D:
either (a) or (c)
Answer: A

DC potentiometer can measure voltages upto about 1.5 V. Volt ratio box is used to reduce the unknown voltage so that it can be measured by dc potentiometer.

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In figure, the position of voltmeter and ammeter are exchanged. It may result in damage to
A:
both the instruments
B:
ammeter
C:
voltmeter
D:
neither of two
Answer: B

Very high current will flow through ammeter because ammeter resistance is very low.

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