Measurement And Instrumentation MCQ Questions & Answers

81

Lissajous pattern shown in double-beam cathode-ray oscilloscope screen for two sinusoidal voltages of equal magnitude and of the same frequency but of phase shift of 30° electrical is

A) a circle B) a straight at 45° in the first and third quadrant C) an ellipse in the first and third quadrant D) an ellipse in the second and fourth quadrant

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Answer & Solution

Answer: Option C

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82

The meter suitable for only DC measurement

A) Moving iron type B) Permanent magnet type C) Electrodynamics type D) Hot wire type

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Answer & Solution

Answer: Option B

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83

What will be seen on the screen of a CRO, when a sinusoidal voltage signal is applied to the vertical deflection plate of this CRO with no simultaneous signal applied to the horizontal deflection plate?

A) A horizontal line B) A vertical line C) A sinusoidal signal D) A spot at the centre of the screen

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Answer & Solution

Answer: Option B

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84

A 0-300 V Voltmeter has an error of ±2% of full deflection. What would be the range of readings if true voltage is 30 V?

A) 20 V to 40 V B) 29 V to 30.6 V C) 24 V to 36 V D) 28 V to 32 V

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Answer & Solution

Answer: Option C

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85

A sinusoidal voltage of amplitude 150 V has been applied to a circuit having a rectifying device and prevents flow of current in one direction and offers a resistance of 15 Ω for the flow of current in the other direction. If hot wire type and PMMC type instruments are connected in this circuit to measure the electric current, their readings would respectively be:

A) 3.18 A and 5 A B) 7.07 A and 3.18 A C) 3.18 A and 5 mA D) 5 A and 3.18 mA

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Answer & Solution

Answer: Option A

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86

A popular method of increasing the range of an ac instrument is use of

A) shunt B) multiplier C) ac potentiometer D) instrument transformer

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Answer & Solution

Answer: Option D

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87

A liquid flows through a pipe of 100 mm diameter at a velocity of 1 m/s. If the diameter is guaranteed within ±1% and the velocity is known to be within ±3% of measured value, the limiting error for the rate of flow is

A) ±1% B) ±2% C) ±3% D) ±5%

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Answer & Solution

Answer: Option D

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88

Which of the following methods are used for producing damping torque in analog instruments?
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping

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

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Answer & Solution

Answer: Option D

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89

Majority of digital voltmeter are built with a dual - slope ADC because:

A) Dual-slope ADC is less complex B) Dual-slope ADC is faster C) Dual-slope ADC can be designed to be insensitive to noise and interference D) Dual-slope ADC provide BCD output

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Answer & Solution

Answer: Option C

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90

The Wein bridge circuit shown in the figure below can be used as a frequency measuring device, provided
Measurement and Instrumentation mcq question image

Measurement and Instrumentation mcq question image

A) $$\frac{{{R_2}}}{{{R_4}}} = 2$$ B) $$\frac{{{R_4}}}{{{R_2}}} = 2$$ C) $$\frac{{{R_2}}}{{{R_4}}} = 4$$ D) $$\frac{{{R_2}}}{{{R_4}}} = 3$$

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Answer & Solution

Answer: Option A

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Measurement And Instrumentation MCQ Questions & Answers | ECE