Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 210 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.

What does S in ‘IP 11S’ represent?
A. Machine was tested when it was in running.
B. Machine was tested when not running condition.
C. Machine was tested at light load.
D. None of these.
Answer» C. Machine was tested at light load.
Discussion
52.

Which cooling system is employed for large transformers?
A. Oil natural oil forced
B. Oil natural air forced
C. Oil forced air forced
D. Both (b) and (c)
E. All of these
Answer» E. All of these
Discussion
53.

Which among the following safety devices are provided on the power transformers?
A. Marshalling kiosk
B. Vacuum gauge
C. Pressure relief gauge
D. All of these
E. None of these
Answer» E. None of these
Discussion
54.

What should be the permissible sag in meters between two towers if the voltage to be carried is 66 kV?
A. 2 – 4 m
B. 5 – 7 m
C. 4 – 5 m
D. 1.5 m
Answer» B. 5 – 7 m
Discussion
55.

Which factor is controlled by turbine and governor?
A. Voltage
B. Frequency
C. Power factor
D. All of these
Answer» C. Power factor
Discussion
56.

On what factor does the starting current of the induction motor depend?
A. Starting torque required
B. Losses allowed during starting
C. Both (A) and (B)
D. None of these
Answer» D. None of these
Discussion
57.

What is the application of synchronous motor of speed less than 750 rpm?
A. Fans
B. Pumps
C. Ball mills
D. Compressors
Answer» D. Compressors
Discussion
58.

Which type of foundation is preferred for lattice towers?
A. Rock foundation
B. Pole foundation
C. Anchor foundation
D. All of these
E. None of these
Answer» E. None of these
Discussion
59.

Which among these is a configuration of an isolator? i. Vertical break type ii. Horizontal type iii. Horizontal break with two post insulator iv. Horizontal break centre post rotating double break v. Pantograph type
A. Only ii and iii
B. i, ii, iii, and iv
C. i, ii, iii, iv, v
D. i, ii, iv, v
Answer» D. i, ii, iv, v
Discussion
60.

Corona rings are fixed on which among these?
A. At cross arm end of the string assembly
B. At corners of bus bar joints
C. Only at contacts of isolators
D. Only b and c
E. All of these
Answer» F.
Discussion
61.

Which system present in the synchronous motor makes it costlier than Induction motor of the same size?
A. Damper windings
B. Additional excitation system
C. Additional field windings
D. None of these
Answer» C. Additional field windings
Discussion
62.

Which among these tests is performed to check the dissipation factor?
A. Acceptance tests
B. Periodic maintenance tests
C. Both (a) and (b)
D. Power factor test
E. All the above
Answer» D. Power factor test
Discussion
63.

What is meant by Creepage Distance?
A. Shortest distance between two conducting parts along a stretched string.
B. Shortest distance between two conducting parts along the surface of the insulating material.
C. Distance between ground and the highest earthed point on the equipment.
D. All of these
Answer» C. Distance between ground and the highest earthed point on the equipment.
Discussion
64.

Arrange these in the correct order of the sequence for designing the tower? i. Design data ii. Prototype manufacture iii. Providing tests iv. Preliminary design v. Final design vi. Earlier experience
A. vi – i – iv – v – ii – iii
B. vi – i – iv – ii – iii – v
C. i – vi – iv – v – ii – iii
D. i – iv – iv – ii – iii – v
Answer» C. i – vi – iv – v – ii – iii
Discussion
65.

Which among these types of bus bars can be used outdoor?
A. Tubular
B. ACSR
C. AAC
D. All of these
E. None of these
Answer» E. None of these
Discussion
66.

Which among these is a type of surge arrestor?
A. Conventional gapped arrestors
B. Metal oxide arrestors
C. Both (A) and (B)
D. None of these
Answer» D. None of these
Discussion
67.

Which place is the ‘Regional load dispatch centre’ for the western region in the national grid?
A. Mumbai
B. Ahmadabad
C. Bhopal
D. Nagpur
Answer» B. Ahmadabad
Discussion
68.

Which material is used for indoor bus bar?
A. Copper
B. Aluminium
C. Silver
D. Both (A) and (B)
Answer» B. Aluminium
Discussion
69.

Which among these waves is called a standard lightning impulse wave?
A. 1.2 / 100 microsecond wave
B. 1.2 / 50 microsecond wave
C. 2.4 / 100 microsecond wave
D. 2.4 / 50 microsecond wave
Answer» C. 2.4 / 100 microsecond wave
Discussion
70.

Which among these is a method to minimise eddy current loss?
A. Laminated core
B. Insulation of lamination
C. Use of material of high electrical resistivity
D. Only a and c
E. All of these
Answer» F.
Discussion
71.

What value of DAR ratio indicates a poor insulation?
A. Below 2.5
B. Below 1.25
C. Above 1.25
D. Above 2
Answer» C. Above 1.25
Discussion
72.

Which among these materials is a permanent magnetic material?
A. Palladium
B. Chromium steel
C. Silicon steel
D. All of these
Answer» C. Silicon steel
Discussion
73.

Which device is connected in series?
A. RC surge suppressors
B. Smoothing reactors
C. Metal oxide veristors
D. Static balancer
Answer» C. Metal oxide veristors
Discussion
74.

What will be the span of a transmission line carrying a voltage of 11 kV?
A. 200 m
B. 100 m
C. 260 m
D. 80 m
Answer» C. 260 m
Discussion
75.

What is the preferred value of DC test voltage for site?
A. 104 % of the routine factory AC test voltage
B. 65 % of the routine factory AC test voltage
C. 1.6 % of the routine factory AC test voltage
D. 75 % of the routine factory AC test voltage
Answer» B. 65 % of the routine factory AC test voltage
Discussion
76.

What test is performed to verify that the equipment is ready for energising?
A. Maintenance test
B. Commissioning test
C. Type test
D. Reliability test
Answer» C. Type test
Discussion
77.

Which among these devices are used to protect low voltage induction motor?
A. Thermal overload relay
B. HRC fuse
C. Contactor starter
D. All of these
E. None of these
Answer» E. None of these
Discussion
78.

What is the first equipment placed in the uninterrupted power supply (UPS)?
A. Inverter
B. Battery
C. Rectifier
D. Any of these
Answer» D. Any of these
Discussion
79.

What type of insulation is preferred for DC smoothing Reactors?
A. Air
B. Oil
C. Paper
D. Varnish
Answer» C. Paper
Discussion
80.

Which among these is a commissioning check during site testing for an induction motor?
A. Insulation resistance
B. Terminal shrouds
C. Heater supply
D. All of these
Answer» B. Terminal shrouds
Discussion
81.

What is the value of the permanently connected capacitor in capacitor start capacitor run induction motor?
A. 40 μ F
B. 5 μ F
C. 300 μ F
D. 1000 μ F
Answer» B. 5 μ F
Discussion
82.

Which properties should a material posse so as to be used for electrical equipments? i. High resistance ii. High luminosity iii. Fire retarding insulation iv. High permittivity
A. i and ii only
B. i and iv only
C. i, iii and iv
D. All of these
Answer» E.
Discussion
83.

Which among these is an application of single phase synchronous AC motor?
A. Small drill
B. Large drill
C. Dishwasher
D. Sewing machine
Answer» D. Sewing machine
Discussion
84.

At what percentage of the rated speed is the starting winding of a capacitor start induction disconnected with the help of a centrifugal switch?
A. 50 % of the rated speed
B. 70 % of the rated speed
C. 25 % of the rated speed
D. 5 % of the rated speed
Answer» C. 25 % of the rated speed
Discussion
85.

Where is the synchronous motor drive with cycloconverters used?
A. Compressors
B. Ball mills in cement plants
C. Fans
D. All of these
Answer» C. Fans
Discussion
86.

Why are the high voltage test conducted on the rotating machine?
A. To check the winding resistance
B. To check the insulation of windings
C. To check the maximum power rating of the machine
D. All of these
E. None of these
Answer» C. To check the maximum power rating of the machine
Discussion
87.

Which among these devices are required for manual control of induction motors?
A. Drum controller
B. Face plate starter
C. Toggle switch
D. Only b and c
E. All of these
Answer» F.
Discussion
88.

What is the range of MHV substations?
A. All voltages above 1000 V AC
B. Voltages between 1kV and 33 kV
C. Between 33 kV and 110 kV
D. 220 kV and 400 kV
Answer» C. Between 33 kV and 110 kV
Discussion
89.

What is / are the types of substations suitable for voltage 66 kV and above?
A. Conventional outdoor
B. SF^ gas insulated metal enclosed substation
C. Hybrid substation
D. Only b and c
E. All of these
Answer» F.
Discussion
90.

Which part of the tower is buried in the ground?
A. Anchor
B. Guy wire
C. Braces
D. Strut inclined support
Answer» B. Guy wire
Discussion
91.

Which among these is the cause of sparking at brushes in DC motor?
A. Defective brushes
B. Defect in Commutator
C. Excessive load
D. Only a and b
E. All of these
Answer» F.
Discussion
92.

For which among these applications is porcelain used? i. Enclosure for CTs and circuit breakers ii. Enclosure for large indoor transformers iii. Enclosure for bushing iv. Support for bus bars
A. i and ii only
B. ii, iii and iv only
C. i, iii and iv only
D. i, ii, iii and iv
Answer» D. i, ii, iii and iv
Discussion
93.

What is the main application of single phase circuit breaker?
A. In power generating station
B. On the roof of coach
C. Both (a) and (b)
D. On the distribution system
Answer» C. Both (a) and (b)
Discussion
94.

What is the application of ‘inverse torque power output type’ squirrel cage motor?
A. Conveyors
B. Fans
C. Centrifugal pumps
D. Machine tools
Answer» E.
Discussion
95.

What is the possible cause if the slip ring induction motor fails to start?
A. Open rheostat
B. Overload
C. Brushes do not touch collector rings
D. Only (b) and (c)
E. All of these
Answer» F.
Discussion
96.

Which among the following factors affect the cost of motor? i. Reliability and Availability ii. Installation & Commissioning charges iii. Running cost, KVAr iv. Depression formula used
A. i & ii
B. ii, iii, iv
C. i, ii, iv
D. i, ii, iii & iv
Answer» E.
Discussion
97.

What results if the rotor bar of a squirrel cage rotor is broken?
A. Noise
B. Low starting torque
C. Rated speed is not reached even with rated voltage and frequency
D. All of these
E. None of these
Answer» E. None of these
Discussion
98.

What test is conducted on the synchronous motor before completely assembling the whole machine?
A. Speed torque curves
B. Bearing insulation
C. Dielectric tests on the armature windings
D. Measurement of DC resistance of armature winding
Answer» C. Dielectric tests on the armature windings
Discussion
99.

What is / are the main causes for the noise in the machine?
A. Magnetostriction
B. Aerodynamics
C. Bearing noise of rotating shaft
D. Only b and c
E. All of these
Answer» F.
Discussion
100.

Which method is used to measure the speed of a synchronous machine?
A. Stroboscopic method
B. By tachometer
C. By measuring the frequency by means of frequency meter
D. Only a and b
E. All of these
Answer» F.
Discussion