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100+ Measurement and Instrumentation Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .

1.

The use of _____ instruments is merely confined within laboratories as stand¬ardizing instruments.

A. absolute
B. indicating
C. recording
D. integrating
Answer» A. absolute
2.

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

A. Absolute instruments
B. Indicating instruments
C. Recording instruments
D. Integrating instruments
Answer» B. Indicating instruments
3.

_____ instruments are those which measure the total quantity of electricity delivered in a particular time.

A. Absolute
B. Indicating
C. Recording
D. Integrating
Answer» D. Integrating
4.

Which of the following are integrating instruments ?

A. Ammeters
B. Voltmeters
C. Wattmeters
D. Ampere-hour and watt-hour meters
Answer» D. Ampere-hour and watt-hour meters
5.

Resistances can be measured with the help of

A. wattmeters
B. voltmeters
C. ammeters
D. ohmmeters and resistance bridges
Answer» D. ohmmeters and resistance bridges
6.

According to application, instruments are classified as

A. switch board
B. portable
C. both (a) and (b)
D. moving coil
Answer» C. both (a) and (b)
7.

Which of the following essential features is possessed by an indicating instrument ?

A. Deflecting device
B. Controlling device
C. Damping device
D. All of the above
Answer» D. All of the above
8.

A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly

A. deflecting
B. controlling
C. damping
D. any of the above
Answer» C. damping
9.

The spring material used in a spring control device should have the following property.

A. Should be non-magnetic
B. Most be of low temperature co-efficient
C. Should have low specific resistance
D. All of the above
Answer» D. All of the above
10.

Which of the following properties a damping oil must possess ?

A. Must be a good insulator
B. Should be non-evaporating
C. Should not have corrosive action upon the metal of the vane
D. All of the above
Answer» D. All of the above
11.

A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.

A. ammeter
B. voltmeter
C. flux-meter
D. ballistic galvanometer
Answer» A. ammeter
12.

A moving-coil permanent-magnet instrument can be used as flux-meter

A. by using a low resistance shunt
B. by using a high series resistance
C. by eliminating the control springs
D. by making control springs of large moment of inertia
Answer» C. by eliminating the control springs
13.

Which of the following devices may be used for extending the range of instruments ?

A. Shunts
B. Multipliers
C. Current transformers
D. All of the above
Answer» D. All of the above
14.

An induction meter can handle current upto

A. 10 A
B. 30 A
C. 60 A
D. 100 A
Answer» D. 100 A
15.

For handling greater currents induction wattmeters are used in conjunction with

A. potential transformers
B. current transformers
C. power transformers
D. either of the above
Answer» B. current transformers
16.

Induction type single phase energy meters measure electric energy in

A. kW
B. Wh
C. kWh
D. VAR
Answer» C. kWh
17.

Most common form of A.C. meters met with in every day domestic and industrial installations are

A. mercury motor meters
B. commutator motor meters
C. induction type single phase energy meters
D. all of the above
Answer» C. induction type single phase energy meters
18.

Which of the following meters are not used on D.C. circuits

A. Mercury motor meters
B. Commutator motor meters
C. Induction meters
D. None of the above
Answer» C. Induction meters
19.

Which of the following is an essential part of a motor meter ?

A. An operating torque system
B. A braking device
C. Revolution registering device
D. All of the above
Answer» D. All of the above
20.

A potentiometer may be used for

A. measurement of resistance
B. measurement of current
C. calibration of ammeter
D. all of the above
Answer» D. all of the above
21.

is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,

A. Tangent galvanometer
B. Meggar
C. Current transformer
D. None of the above
Answer» B. Meggar
22.

The household energy meter is

A. an indicating instrument
B. a recording instrument
C. an integrating instrument
D. none of the above
Answer» C. an integrating instrument
23.

The pointer of an indicating instrument should be

A. very light
B. very heavy
C. either (a) or (b)
D. neither (a) nor (b)
Answer» A. very light
24.

The chemical effect of current is used in

A. D.C. ammeter hour meter
B. D.C. ammeter
C. D.C. energy meter
D. none of the above
Answer» A. D.C. ammeter hour meter
25.

In majority of instruments damping is provided by

A. fluid friction
B. spring
C. eddy currents
D. all of the above
Answer» C. eddy currents
26.

An ammeter is a

A. secondary instrument
B. absolute instrument
C. recording instrument
D. integrating instrument
Answer» A. secondary instrument
27.

In a portable instrument, the controlling torque is provided by

A. spring
B. gravity
C. eddy currents
D. all of the above
Answer» A. spring
28.

The disc of an instrument using eddy current damping should be of

A. conducting and magnetic material
B. non-conducting and magnetic material
C. conducting and non-magnetic material
D. none of the above
Answer» C. conducting and non-magnetic material
29.

The switch board instruments

A. should be mounted in vertical position
B. should be mounted in horizontal position
C. either (a) or (b)
D. neither (a) nor (b)
Answer» A. should be mounted in vertical position
30.

The function of shunt in an ammeter is to

A. by pass the current
B. increase the sensitivity of the ammeter
C. increase the resistance of ammeter
D. none of the above
Answer» A. by pass the current
31.

The multiplier and the meter coil in a voltmeter are in

A. series
B. parallel
C. series-parallel
D. none of the above
Answer» A. series
32.

A moving iron instrument can be used for

A. D.C. only
B. A.C. only
C. both D.C. and A.C.
D. none
Answer» C. both D.C. and A.C.
33.

The scale of a rectifier instrument is

A. linear
B. non-linear
C. either (a) or (b)
D. neither (a) nor (b)
Answer» A. linear
34.

For measuring current at high frequency we should use

A. moving iron instrument
B. electrostatic instrument
C. thermocouple instrument
D. none of the above
Answer» C. thermocouple instrument
35.

The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

A. almost zero
B. low
C. high
D. none of the above
Answer» C. high
36.

A dynamometer wattmeter can be used for

A. both D.C. and A.C.
B. D.C. only
C. A.C. only
D. any of the above
Answer» A. both D.C. and A.C.
37.

An induction wattmeter can be used for

A. both D.C. and A.C.
B. D.C. only
C. A.C. only
D. any of the above
Answer» B. D.C. only
38.

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

A. load impedance is high
B. load impedance is low
C. supply voltage is low
D. none of the above
Answer» A. load impedance is high
39.

In a low power factor wattmeter the pressure coil is connected

A. to the supply side of the current coil
B. to the load side of the current coil
C. in any of the two meters at connection
D. none of the above
Answer» B. to the load side of the current coil
40.

In a low power factor wattmeter the compensating coil is connected

A. in series with current coil
B. in parallel with current coil
C. in series with pressure coil
D. in parallel with pressure coil
Answer» C. in series with pressure coil
41.

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was

A. unity
B. 0.8 lagging
C. 0.8 leading
D. zero
Answer» A. unity
42.

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be

A. unity
B. 0.5
C. 0.3
D. zero
Answer» B. 0.5
43.

The adjustment of position of shading bands, in an energy meter is done to provide

A. friction compensation
B. creep compensation
C. braking torque
D. none of the above
Answer» A. friction compensation
44.

An ohmmeter is a

A. moving iron instrument
B. moving coil instrument
C. dynamometer instrument
D. none of the above
Answer» B. moving coil instrument
45.

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is

A. short-circuited
B. all right
C. faulty
D. none
Answer» B. all right
46.

For measuring a very high resistance we should use

A. Kelvin's double bridge
B. Wheat stone bridge
C. Meggar
D. None of the above
Answer» C. Meggar
47.

The electrical power to a meggar is provided by

A. battery
B. permanent magnet D.C. generator
C. AC. generator
D. any of the above
Answer» B. permanent magnet D.C. generator
48.

In a meggar controlling torque is provided by

A. spring
B. gravity
C. coil
D. eddy current
Answer» C. coil
49.

The operating voltage of a meggar is about

A. 6 V
B. 12 V
C. 40 V
D. 100 V
Answer» D. 100 V
50.

Murray loop test can be used for location of

A. ground fault on a cable
B. short circuit fault on a cable
C. both the ground fault and the short-circuit fault
D. none of the above
Answer» C. both the ground fault and the short-circuit fault

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