electrical

Electrical Instruments MCQ Objective Questions and Answers Page - 4

1.

Which of the following does not require auxiliary circuitry if used as transducer  ?

Answer/ Hint      

Answer : B

Explanation :

2.

The most light sensitive transducer for conversion of light into electrical power is the

Answer/ Hint      

Answer : D

Explanation :

3.

The tachometer encoder has

Answer/ Hint      

Answer : A

Explanation :

4.

A tachometer encoder can be used for measurement of speed

Answer/ Hint      

Answer : D

Explanation :

5.

Incremental encodes use

Answer/ Hint      

Answer : C

Explanation :

6.

The drawbacks of incremental encoders are that

Answer/ Hint      

Answer : D

Explanation :

7.

Absolute encoders are normally used for

Answer/ Hint      

Answer : A

Explanation :

8.

Absolute encoders are used where

Answer/ Hint      

Answer : D

Explanation :

9.

A spatial encoder is  an/a

Answer/ Hint      

Answer : B

Explanation :

10.

Optical and photoelectric sensing system are used by

Answer/ Hint      

Answer : B

Explanation :

11.

More fringes are used for measurement of rotary displacement along with

Answer/ Hint      

Answer : B

Explanation :

12.

Name the instrument for angular measurement

Answer/ Hint      

Answer : C

Explanation :

13.

The resolution of a 8-bit shaft encoder is

Answer/ Hint      

Answer : C

Explanation :

14.

The operation of converting an input data into a code consisting of a series of logic level signals of zero and one forming a binary number is

Answer/ Hint      

Answer : A

Explanation :

15.

A bolometer is an element that

Answer/ Hint      

Answer : B

Explanation :

16.

Bolometers are used for measuring

Answer/ Hint      

Answer : C

Explanation :

17.

Ring-balance meter cannot be used for measuring

Answer/ Hint      

Answer : C

Explanation :

18.

Which displacement transducer is used for accurate and linear measurement  ?

Answer/ Hint      

Answer : A

Explanation :

19.

One of the following transducers has excellent frequency response

Answer/ Hint      

Answer : C

Explanation :

20.

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

Answer/ Hint      

Answer : B

Explanation :

21.

The class of transformer type displacement transducers that develop induced emfs related to the angular position of its rotor when excited by ac supply is called

Answer/ Hint      

Answer : D

Explanation :

22.

Converters of mechanical energy into magnetic energy are known as

Answer/ Hint      

Answer : C

Explanation :

23.

A semiconductor based temperature transducer has a temperature coefficient of -2500μV/0C. This transducer is indeed a

Answer/ Hint      

Answer : B

Explanation :

24.

Why are dummy strain gauges

Answer/ Hint      

Answer : C

Explanation :

25.

Dummy strain gauges are used for

Answer/ Hint      

Answer : A

Explanation :

26.

Why is strain gauge bridge sometimes excited with ac  ?

Answer/ Hint      

Answer : C

Explanation :

27.

Very small displacements are effectively measured using  :

Answer/ Hint      

Answer : A

Explanation :

28.

Which one of the following transducers is the most suitable for the measurement of linear displacement  ?

Answer/ Hint      

Answer : B

Explanation :

29.

Load cells employ

Answer/ Hint      

Answer : D

Explanation :

30.

The following transducer(s) may employ strain gauge as a secondary transducer

Answer/ Hint      

Answer : D

Explanation :

31.

The factors to be considered in the selection of a load cell for a particular application are

Answer/ Hint      

Answer : D

Explanation :

32.

Which one of the following additional devices is required in order to measure pressure using  LVDT  ?

Answer/ Hint      

Answer : C

Explanation :

33.

Which of the following transducers can be used for measurement of pressures as high as high as  100,000 atmosphere

Answer/ Hint      

Answer : C

Explanation :

34.

Thermal conductivity gauges have the following shortcomings

Answer/ Hint      

Answer : D

Explanation :

35.

The working principle of a Pirani gauge pressure transducer is based on which one of the following  ?

Answer/ Hint      

Answer : B

Explanation :

36.

Pirani gauge is used to measure

Answer/ Hint      

Answer : A

Explanation :

37.

The advantages of ionization vacuum gauges are

Answer/ Hint      

Answer : D

Explanation :

38.

Pick the odd one out

Answer/ Hint      

Answer : D

Explanation :

39.

In strain gauge torque transducers, the strain gauges are mounted at which one of the following  ?

Answer/ Hint      

Answer : B

Explanation :

40.

____________ Instrument will draw least current from the circuit in which it is incorporated.

Answer/ Hint      

Answer : C

Explanation :

41.

Energy meter installed at the residence of electric power consumers is

Answer/ Hint      

Answer : D

Explanation :

42.

Which of the following methods is used to shield a dynamometer type wattmeter against stray field?

Answer/ Hint      

Answer : B

Explanation :

43.

_____________ Type instrument has identical calibration for AC as well as DC values?

Answer/ Hint      

Answer : A

Explanation :

44.

_____________ Type instrument can have full scale deflection of 300 degrees.

Answer/ Hint      

Answer : A

Explanation :

45.

A potentiometer works on

Answer/ Hint      

Answer : D

Explanation :

46.

Which of the following can be measured by the use of a Schering bridge?

Answer/ Hint      

Answer : A

Explanation :

47.

A wattmeter will be free from the effects of power factor and frequency variations in case

Answer/ Hint      

Answer : A

Explanation :

48.

____________ will always indicate true RMS value in respective of the wave form?

Answer/ Hint      

Answer : B

Explanation :

49.

_____________ Method is suitable for the measurement of a resistance of expected value less than one ohm.

Answer/ Hint      

Answer : D

Explanation :

50.

____________  bridge is preferred for the measurement of inductance having high  Q-factor.

Answer/ Hint      

Answer : B

Explanation :

51.

A  Q-meter measures

Answer/ Hint      

Answer : D

Explanation :

52.

The meter constant of single phase energy meter is expressed in terms of

Answer/ Hint      

Answer : A

Explanation :

53.

Moving coil and moving iron type instruments can be distinguished by looking at

Answer/ Hint      

Answer : A

Explanation :

54.

In order to get best results, indicating instruments are

Answer/ Hint      

Answer : D

Explanation :

55.

The dissipation factor of a capacitor can be measured with

Answer/ Hint      

Answer : A

Explanation :

56.

In hot wire instruments the sensing wire is made of

Answer/ Hint      

Answer : D

Explanation :

57.

By which of the following methods an ammeter can be converted to a voltmeter?

Answer/ Hint      

Answer : C

Explanation :

58.

_____________   give the value of the quantity to be measured in terms of the constants of the instruments and their direction only.

Answer/ Hint      

Answer : C

Explanation :

59.

The advantage of moving coil permanent magnet type instrument is

Answer/ Hint      

Answer : D

Explanation :

60.

A portable instrument is likely to have ____________ damping

Answer/ Hint      

Answer : A

Explanation :

61.

A moving iron type ammeter has few turns of thick wire so that

Answer/ Hint      

Answer : D

Explanation :

62.

Hot wire instruments read

Answer/ Hint      

Answer : B

Explanation :

63.

Which of the following instruments can be used for measuring 132 kV AC voltage?

Answer/ Hint      

Answer : A

Explanation :

64.

In  ____________  instruments the deflecting torque depends on the frequency.

Answer/ Hint      

Answer : A

Explanation :

65.

____________  is the commonly used material for thermocouples.

Answer/ Hint      

Answer : D

Explanation :

66.

Which of the following can be measured by ‘Bolometer’?

Answer/ Hint      

Answer : A

Explanation :

67.

___________  frequency meter can be used for the measurement of radio frequency.

Answer/ Hint      

Answer : A

Explanation :

68.

The phenomenon of  ‘creeping’ occurs in

Answer/ Hint      

Answer : D

Explanation :

69.

Highest flux density exists inside which of the following instruments?

Answer/ Hint      

Answer : A

Explanation :

70.

The ratio error of a current transformer is due to

Answer/ Hint      

Answer : B

Explanation :

71.

The  e.m.f.  of a Weston standard cell can be measured by

Answer/ Hint      

Answer : A

Explanation :

72.

The temperature of a furnace can be measured by

Answer/ Hint      

Answer : D

Explanation :

73.

Permanent magnets used in instruments are generally made of

Answer/ Hint      

Answer : B

Explanation :

74.

Which of the following resistance is shown by a needle in a megger not in operation?

Answer/ Hint      

Answer : D

Explanation :

75.

____________  voltmeter has the least power consumption.

Answer/ Hint      

Answer : A

Explanation :

76.

For protecting a galvanometer during transport

Answer/ Hint      

Answer : D

Explanation :

77.

The internal resistance of a voltmeter must be very high so that

Answer/ Hint      

Answer : A

Explanation :

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