Measurement And Instrumentation MCQ Questions & Answers

21

The resistance of two coils of a watt-meter are 0.0 Ω and 100 Ω respectively and both are non-inductive. The current through a resistance load is 20 A and the voltage across it is 30 V. In one of the two ways of connecting the voltage coil, the error in the reading would be

A) 0.1% too high B) 0.2% too high C) 1.5% too high D) zero

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Answer & Solution

Answer: Option D

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22

The use of thermocouple meters for ac measurement leads to a meter scale which is

A) Linear B) Square law C) Logarithmic D) Exponentia

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Answer & Solution

Answer: Option B

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23

Which one of the following statements is not correct in connection with electrodynamic instruments?

A) As the coils are air-cored, these instruments are free from hysteresis and eddy current losses B) These instruments have a high torque/weight ratio and hence have a high sensitivity C) These instruments can be used on both a.c. and d.c. and are very useful where accurate r.m.s. values of voltage irrespective of waveforms, are required D) These are more expensive than either PMMC or moving-iron type instruments

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Answer & Solution

Answer: Option B

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24

Which of the following equipment can check the condition of a transistor?

A) Current tracer B) Ohmmeter C) Digital display meter D) All of these

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Answer & Solution

Answer: Option D

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25

The scale used for moving coil meter is

A) non-linear B) linear C) square scale D) log scale

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Answer & Solution

Answer: Option B

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26

The error in measurement of a DC voltmeter with input signal: 1.5 V, voltage range: 2 V, accuracy: ± (25 ppm of reading + 5 ppm of range) is

A) ±50 µV B) ±30 µV C) ±47.5 µV D) ±10 µV

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Answer & Solution

Answer: Option C

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27

In wire-wound strain gauges, the change in resistance on application of strain is mainly due to

A) Change in length of wire B) Change in diameter of wire C) Change in both length and diameter of wire D) Change in receptivity

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Answer & Solution

Answer: Option C

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28

Absolute encoders are normally used for:

A) One revolution B) Continuous speed in clockwise direction C) Continuous speed in counter clockwise D) Counting least significant bits

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Answer & Solution

Answer: Option A

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29

In a Q meter, distributed capacitance of coil is measured by changing the capacitance of the tuning capacitor. The values of tuning capacitor are C₁ and C₂ for resonant frequency f₁ and 2f₁ respectively. The value of distributed capacitance is:

A) $$\frac{{{C_1} - {C_2}}}{2}$$ B) $$\frac{{{C_1} - 2{C_2}}}{3}$$ C) $$\frac{{{C_1} - 4{C_2}}}{3}$$ D) $$\frac{{{C_1} - 3{C_2}}}{2}$$

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Answer & Solution

Answer: Option C

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30

Three phase four wire energy meter is used to measure:

A) Single phase energy B) Two phase energy C) Three phase balanced energy D) Three phase unbalanced energy

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Answer & Solution

Answer: Option D

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Measurement And Instrumentation MCQ Questions & Answers | ECE