Measurement And Instrumentation MCQ Questions & Answers

51

Match List-I with List-II and select the correct answer using the options given below:

List-I (Measuring bridge)	List-II (Application)
a. Kelvin Double Bridge	1. Capacitance
b. Wien Bridge	2. Self inductance
c. Schering Bridge	3. Frequency
d. Maxwell's Bridge	4. Low resistance

A) a-4, b-2, c-1, d-3 B) a-1, b-3, c-4, d-2 C) a-4, b-3, c-1, d-2 D) a-1, b-2, c-4, d-3

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Answer & Solution

Answer: Option C

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52

Which one of the following detectors is generally used in ac bridges for audio frequency range?

A) AC voltmeter B) CRO C) Headphones D) Vibrations galvanometer

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Answer & Solution

Answer: Option C

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53

While using Maxwell bridge, the Q factor of a coil is obtained as

A) $$\frac{1}{{\omega CR}}$$ B) $$\omega CR$$ C) $$\frac{{\omega C}}{R}$$ D) $$\frac{R}{{\omega C}}$$

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Answer & Solution

Answer: Option B

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54

The most fundamental method of frequency measurement is

A) By comparison B) By using absorption wave meter C) By using slotted line D) By using transmission wave meter

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Answer & Solution

Answer: Option A

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55

In the circuit shown in the figure, if the voltmeter and the ammeter are interchanged, it likely to result in damage to
Measurement and Instrumentation mcq question image

Measurement and Instrumentation mcq question image

A) both the instruments B) the ammeter C) the voltmeter D) neither of these instruments

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Answer & Solution

Answer: Option B

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56

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows:

A) Pressure is lower but velocity is higher B) Pressure is higher but velocity is lower C) Both pressure and velocity are lower D) Pressure and velocity are identical

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Answer & Solution

Answer: Option A

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57

The full-scale deflecting torque of a 20 A moving-iron ammeter is 6 × 10^-5 N-m. What is the rate of change of self-inductance with respect to the deflection of the pointer of the ammeter at full scale?

A) 0.5 µH/rad B) 0.2 µH/rad C) 1.3 µH/rad D) 0.3 µH/rad

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Answer & Solution

Answer: Option D

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58

Which of the following statements is true about two wattmeter method for power measurement in three phase current?

A) Power can be measured using two wattmeter method only for star connected three phase circuits B) When two meters show identical readings, the power factor is 0.5 C) When power factor is unity, one of the wattmeter reads zero D) When the readings of the two wattmeters are equal but of opposite sign, the power factor is zero

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Answer & Solution

Answer: Option D

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59

To detect the small output voltage of LVDT which DVM is preferable.

A) $$2\frac{1}{2}$$ digit B) 3 digit C) $$3\frac{1}{2}$$ digit D) 4 digit

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Answer & Solution

Answer: Option D

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60

In a digital voltmeter, input signal is integrated for a duration of 50 clock cycles. To eliminate the effect of 100 Hz noise present in the signal, what is the maximum clock frequency?

A) 5 kHz B) 50 kHz C) 100 kHz D) 250 kHz

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Answer & Solution

Answer: Option A

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Measurement And Instrumentation MCQ Questions & Answers | ECE