Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 109 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

51.

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» B. D.C. only
Discussion
52.

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» B. load impedance is low
Discussion
53.

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» B. creep compensation
Discussion
54.

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» B. should be mounted in horizontal position
Discussion
55.

An ammeter is a______________?
A. secondary instrument
B. absolute instrument
C. recording instrument
D. integrating instrument
Answer» B. absolute instrument
Discussion
56.

The household energy meter is_______________?
A. an indicating instrument
B. a recording instrument
C. an integrating instrument
D. none of the above
Answer» D. none of the above
Discussion
57.

In a portable instrument, the controlling torque is provided by_____________?
A. spring
B. gravity
C. eddy currents
D. all of the above
Answer» B. gravity
Discussion
58.

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» B. very heavy
Discussion
59.

In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?
A. parallel
B. perpendicular
C. inclined at 60°
D. inclined at 120°
Answer» C. inclined at 60°
Discussion
60.

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» D. None of the above
Discussion
61.

In majority of instruments damping is provided by______________?
A. fluid friction
B. spring
C. eddy currents
D. all of the above
Answer» D. all of the above
Discussion
62.

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» D. none of the above
Discussion
63.

Which of the following are integrating instruments ?
A. Ammeters
B. Voltmeters
C. Wattmeters
D. Ampere-hour and watt-hour meters
Answer» E.
Discussion
64.

Resistances can be measured with the help of_______________?
A. wattmeters
B. voltmeters
C. ammeters
D. ohmmeters and resistance bridges
E. all of the above
Answer» E. all of the above
Discussion
65.

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a _________________?
A. single-phase winding
B. two-phase winding
C. three-phase winding
D. any of the above
Answer» C. three-phase winding
Discussion
66.

If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?
A. the bridge can always be balanced
B. the bridge cannot be balanced
C. the bridge can be balanced if the resistances have some specific values
Answer» C. the bridge can be balanced if the resistances have some specific values
Discussion
67.

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. Should not be subjected to fatigue
E. All of the above
Answer» F.
Discussion
68.

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of___________?
A. 0.1 Hz
B. 0.25 Hz
C. 0.5 Hz
D. 1.5 Hz
Answer» D. 1.5 Hz
Discussion
69.

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» E.
Discussion
70.

The two pressure coils of a single phase power factor meter have_________________?
A. the same dimensions and the same number of turns
B. the same dimension but different number of turns
C. the same number of turns but different dimensions
D. none of the above
Answer» B. the same dimension but different number of turns
Discussion
71.

A Weston frequency meter is_____________?
A. moving coil instrument
B. moving iron instrument
C. dynamometer instrument
D. none of the above
Answer» C. dynamometer instrument
Discussion
72.

In a Schering bridge the potential of the detector above earth potential is______________?
A. a few volts only
B. 1 kV
C. 5 kV
D. 10 kV
Answer» B. 1 kV
Discussion
73.

If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is_________________?
A. 10°
B. 80°
C. 120°
D. 170°
Answer» B. 80°
Discussion
74.

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?
A. 0.1 Hz
B. 0.25 Hz
C. 0.5 Hz
D. 1.5 Hz
Answer» D. 1.5 Hz
Discussion
75.

The power factor of a single phase load can be calculated if the instruments available are_____________?
A. one voltmeter and one ammeter
B. one voltmeter, one ammeter and one wattmeter
C. one voltmeter, one ammeter and one energy meter
D. any of the above
Answer» C. one voltmeter, one ammeter and one energy meter
Discussion
76.

In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?
A. as long as possible
B. as short as possible
C. neither too small not too large
D. very thick
Answer» B. as short as possible
Discussion
77.

To measure a resistance with the help of a potentiometer it is_________________?
A. necessary to standardise the potentiometer
B. not necessary to standardise the potentiometer
C. necessary to use a volt ratio box in conjunction with the potentiometer
D. none of the above
Answer» C. necessary to use a volt ratio box in conjunction with the potentiometer
Discussion
78.

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» C. AC. generator
Discussion
79.

A direct current can be measured by________________?
A. a D.C. potentiometer directly
B. a D.C. potentiometer in conjunction with a standard resistance
C. a D.C. potentiometer in conjunction with a volt ratio box
D. none of the above
Answer» C. a D.C. potentiometer in conjunction with a volt ratio box
Discussion
80.

Which of the following devices should be used for accurate measurement of low D.C. voltage ?
A. Small range moving coil voltmeter
B. D.C. potentiometer
C. Small range thermocouple voltmeter
D. None of the above
Answer» C. Small range thermocouple voltmeter
Discussion
81.

It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?
A. D.C. voltmeter
B. Ammeter and a known resistance
C. D.C. potentiometer
D. None of the above
Answer» D. None of the above
Discussion
82.

An ohmmeter is a____________?
A. moving iron instrument
B. moving coil instrument
C. dynamometer instrument
D. none of the above
Answer» C. dynamometer instrument
Discussion
83.

In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?
A. exactly 0°
B. approximately 0°
C. exactly 90°
D. approximately 90°
Answer» D. approximately 90°
Discussion
84.

Basically a potentiometer is a device for________________?
A. comparing two voltages
B. measuring a current
C. comparing two currents
D. measuring a voltage
E. none of the above
Answer» B. measuring a current
Discussion
85.

Wagner earthing device is used to eliminate errors due to________________?
A. electrostatic coupling
B. electromagnetic coupling
C. both A. and B.
D. none of the above
Answer» B. electromagnetic coupling
Discussion
86.

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?
A. 0°
B. 60°
C. 90°
D. 120°
Answer» E.
Discussion
87.

A power factor meter has________________?
A. one current circuit and two pressure circuits
B. one current circuit and one pressure circuit
C. two current circuits and one pres¬sure circuit
D. none of the above
Answer» B. one current circuit and one pressure circuit
Discussion
88.

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» C. 0.3
Discussion
89.

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
A. from a source which is not the same as the unknown voltage
B. from a battery
C. from the same source as the unknown voltage
D. any of the above
Answer» D. any of the above
Discussion
90.

In a meggar controlling torque is provided by______________?
A. spring
B. gravity
C. coil
D. eddy current
Answer» D. eddy current
Discussion
91.

A phase shifting transformer is used in conjunction with_______________?
A. D.C. potentiometer
B. Drysdale potentiometer
C. A.C. co-ordinate potentiometer
D. Crompton potentiometer
Answer» C. A.C. co-ordinate potentiometer
Discussion
92.

A voltage of about 200 V can be measured__________________?
A. directly by a D.C. potentiometer
B. a D.C. potentiometer in conjunction with a volt ratio box
C. a D.C. potentiometer in conjunction with a known resistance
D. none of the above
Answer» C. a D.C. potentiometer in conjunction with a known resistance
Discussion
93.

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» C. in any of the two meters at connection
Discussion
94.

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» D. none of the above
Discussion
95.

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?
A. out of phase by 90°
B. out of phase by 60°
C. out of phase by 30°
D. out of phase by 0°
E. out of phase by 180°
Answer» B. out of phase by 60°
Discussion
96.

To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?
A. magnetic screening
B. Wagner earthing device
C. wave filters
D. any of the above
Answer» B. Wagner earthing device
Discussion
97.

For measurement of mutual inductance we can use________________?
A. Anderson bridge
B. Maxwell’s bridge
C. Heaviside bridge
D. Any of the above
Answer» D. Any of the above
Discussion
98.

A universal RLC bridge uses_________________?
A. Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance
B. Maxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance
C. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance
D. Any of the above
Answer» C. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance
Discussion
99.

According to application, instruments are classified as_____________?
A. switch board
B. portable
C. both A. and B.
D. moving coil
E. moving iron
Answer» D. moving coil
Discussion
100.

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» B. 0.8 lagging
Discussion