ECE · all questions

Measurement And Instrumentation
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Q201

Which of the following instruments will be used to measure the temperature above 1600°C

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Q202

Which one of the following is composed of two characteristics: conformity and the number of significant figures to which a measurement may be made?

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Q203

In a Q-meter, the value of shunt resistance connected across the oscillator is typically of the order of

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Q204

Torque/weight ratio of an instrument indicates

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Q205

A disc mounted on the shaft of a machine has 12 pattern points. The number of flashes projected on the disc by a stroboscope is 6000 in a minute. When the disc appears stationary and it has single image of 12 points, the speed of the machine will be

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Q206

The number of turns of wire needed to provide a potentiometer with a resolution of 0.05% is:

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Q207

A peak-responding ac voltmeter employing a half-wave precision rectifier has been calibrated to give a reading of 1 V for 1 V rms sinusoidal input. For 1 V dc input, the meter reading will be

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Q208

The energy meter installed near the main switch in a residence and other locations is

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Q209

In a piezoelectric crystal oscillator, if x represent the mass of the crystal, then the oscillation or tuning frequency is linearly proportional to

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Q210

A wattmeter will read zero under the following condition

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Q211

For a rotameter, which one of the following statements is TRUE?

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Q212

In an electro dynamometer, a moving coil has an area A, turn N and carries a current I producing a magnetic flux B. The torque on the moving coil is proportional to

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Q213

An inductor tunes at 200 kHz with 624 pF capacitor and at 600 kHz with 60.4 pF capacitor. The self capacitance of the inductor would be-

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Q214

A 1 m length wire has a resistance of 150 Ω. When it is subjected to strain, its length becomes 1.01 m. The measurement is conducted by a strain gauge whose gauge factor is 2. The change in resistance of the wire is

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Q215

Which of the following transducers requires a high input impedance preamplifier for proper measurements?

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Q216

The values of capacitance and inductance used in the series LCR circuit are 160 pF and 160 µH with the inherent tolerance ±10% in each. Then, the resonance frequency of the circuit is in the range of:

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Q217

Potentiometer can be classified as:

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Q218

In S.I system, unit of stress is:

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Q219

If A = 629 ± 8 and B = 131 ± 3, A - B with range of doubt is

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Q220

If an induction type energy meter runs fast, it can be slowed down by

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