Measurement And Instrumentation MCQ Questions & Answers

81

Considering the following statements:
1. Use of digital computer along with transducer maked data manipulation easier.
2. Digital signals are not dependent on signal amplifiers and so are easy to transmit without distortion and external noise.
3. Increased accuracy in pulse count is possible.
4. There are ergonomic advantages in presenting digital data.
The main advantages of digital transducers include

A) 1, 2 and 4 B) 1, 2 and 3 C) 2, 3 and 4 D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option D

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82

Which of the following are used in making resistance temperature detectors?

A) Nickel B) Tungsten C) Copper D) All these

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Answer & Solution

Answer: Option D

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83

In a vortex shedding flow meter, the shedding frequency is $${\text{f}} = \frac{{{{\text{N}}_{{\text{st}}}}{\text{V}}}}{{\text{D}}}$$ where N_st is

A) Reynolds number B) Mach number C) Strouhal number D) None of these

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Answer & Solution

Answer: Option C

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84

Wagner's earth a.c. bridge circuit is used to eliminate the effect of

A) stray electrostatic fields B) stray electromagnetic fields C) inter-component capacitances D) parasitic capacitance to earth

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Answer & Solution

Answer: Option D

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85

How can be resolution of a wire-wound potentiometer be improved?

A) By increasing the applied voltage B) By decreasing the applied voltage C) By reducing the diameter of the resistance wire D) By increasing the diameter of the resistance wire

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Answer & Solution

Answer: Option C

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86

A Q-meter is supplied with an oscillator having a 500 mV output voltage. While testing an unknown inductor, the voltage across the variable capacitor of the Q-meter, measured by a digital voltmeter, is obtained as 10 V. The Q-factor of the inductor is

A) 5 B) 10 C) 20 D) 0.05

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Answer & Solution

Answer: Option C

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87

The following type of instrument can be used for measuring AC voltage of the highest frequency with reasonable accuracy.

A) Electrodynamometer B) Moving-iron C) Thermal-thermoelectric D) Rectifier

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Answer & Solution

Answer: Option C

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88

PMMC ammeter have uniform scale because

A) of eddy current damping B) they are spring controlled C) their deflecting torque varies directly as current D) Both spring controlled and having deflecting torque varies directly as current

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Answer & Solution

Answer: Option D

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89

Heating effect of current is used in

A) ammeters B) voltmeters C) both ammeters and voltmeters D) wattmeters

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Answer & Solution

Answer: Option C

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90

Optical pyrometer is generally used to measure:

A) Low pressure B) Low temperature C) High temperature D) High pressure

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Answer & Solution

Answer: Option C

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Measurement And Instrumentation MCQ Questions & Answers | ECE