Measurements and Instrumentation
In a thermocouple temperature transducer, the output voltage is usually measured by
Answer: C
The output voltage is very small. So we need a milli voltmeter.
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Consider the following statements: In a differential amplifier using JFET, the differential output offset is due to
1.mismatch between FET parameters
2.difference in values of resistances used in circuit
3.variation in supply voltage.
Of the statements, the correct statements are
Answer: A
Variation in supply voltage affects both amplifiers equally.
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Induction wattmeter can be used in
Answer: A
Induction effect occurs with ac only.
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The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is
Answer: A
Losses = 3650 - 3385 = 265 W uncertainty = ± 20 W.
.
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A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
Answer: D
.
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A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is
Answer: C
.
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A digital frequency counter can be converted to DVM by addition of a suitable
Answer: B
D/A converter changes digital output to analog output.
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Electrostatic voltmeter is suitable only for low voltages.
Answer: B
It is suitable for high voltage.
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The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10-6 N-m on full scale. If B = 1 Wb/m2, range of meter is
Answer: B
NBAI = Controlling torque or 
= 240 x 10-6 or I = 2 mA.
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An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
Answer: B
0.05 x a = 3 x 103 x 10-3 or a = 60 m/s2.
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