Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 147 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.

1.

Which statement is true, with respect to the motor installation?
A. Wood work is used for mounting switchgears.
B. All equipments used in power wiring shall be of iron clad.
C. Looping of conductors is usually made.
D. The length of flexible conduit is more than 3 m.
Answer» C. Looping of conductors is usually made.
Discussion
2.

What should be the minimum depth of trench from the ground level for cables carrying a voltage between 3.3 kV and 11 kV?
A. 0.75 m plus radius of complete cable
B. 0.45 m plus radius of complete cable
C. 1.0 m plus radius of complete cable
D. All of these
Answer» B. 0.45 m plus radius of complete cable
Discussion
3.

Which type of stress is developed in a belted type cable construction used for voltage above 22 kV?
A. Radial stress
B. Tangential stress
C. Electrostatic stress
D. Both (A) and (B)
E. All of these
Answer» E. All of these
Discussion
4.

To prevent the decaying owing to snow and rain, the wooden poles are protected by _____________ cap at the top.
A. Aluminium
B. Zinc
C. Cement
D. All of these
E. None of these
Answer» E. None of these
Discussion
5.

What is the maximum span upto which the wooden poles can be used?
A. 20 m
B. 50 m
C. 60 m
D. 100 m
Answer» D. 100 m
Discussion
6.

Which among the following mode of tendering is used by purchase department? i. Open tendering ii. Limited tender iii. Spot tendering iv. Global tendering v. Proprietary tender
A. i, iii and iv
B. i, ii, iii and v
C. i and iv only
D. i, ii, iii, iv and v
Answer» E.
Discussion
7.

Which among the following information is required for a good estimation? i. Availability of products ii. Sources of production, vendor selection iii. New products and their quality iv. Prices and the discounts provided for each product
A. i and ii
B. ii, iii and iv
C. i, ii, iii and iv
D. only iv
Answer» D. only iv
Discussion
8.

What is an electrical schedule?
A. A list or a plan of a building providing information of number of points in each room.
B. The list of all the electrical components required for a particular room
C. The list of electrical components along with their prices
D. Both (B) and (C)
E. None of these
Answer» B. The list of all the electrical components required for a particular room
Discussion
9.

What is meant by contingencies?
A. The list of required components are included in this category
B. The list of vague and unforeseen items is included in this category
C. The list of components along with their discounted price is included in this category
D. Both (A) and (C)
E. None of these
Answer» C. The list of components along with their discounted price is included in this category
Discussion
10.

Which among these is a part of distribution system?
A. Feeders
B. Distributors
C. Service mains
D. All of these
E. None of these
Answer» E. None of these
Discussion
11.

What is meant by petty purchase?
A. An item purchased from market by purchase assistant with proper formal order.
B. An item purchased from market by purchase assistant without proper formal order.
C. A single tendering purchase
D. None of these
Answer» C. A single tendering purchase
Discussion
12.

Which type of earthing is also called as ‘fire earthing’?
A. Plate earthing
B. Rod earthing
C. Strip earthing
D. All of these
Answer» C. Strip earthing
Discussion
13.

What type of earthing is used by transmission lines?
A. Plate earthing
B. Rod earthing
C. Strip earthing
D. Both (a) & (c)
E. All of these
Answer» D. Both (a) & (c)
Discussion
14.

For what voltage is the H type of poles used?
A. 22 kV
B. 130 kV
C. 11 kV
D. All of these
E. None of these
Answer» C. 11 kV
Discussion
15.

What is the dimension of the copper strips used for the strip earthing?
A. 25 mm * 4 mm
B. 25 mm * 3 mm
C. 30 mm * 4 mm
D. 30 mm * 3 mm
Answer» B. 25 mm * 3 mm
Discussion
16.

Steel rail poles of height 13 meters are used for transmission purpose of _________ voltage.
A. 33 kV
B. 11 kV
C. 22 kV
D. Both (a) & (b)
E. All of these
Answer» B. 11 kV
Discussion
17.

What is the dielectric constant of impregnated paper insulation?
A. 3.5
B. 2.5
C. 4.3
D. 3.8
Answer» B. 2.5
Discussion
18.

Which among these is the main requirement of the insulating materials? i. Non inflammable ii. High permittivity iii. High dielectric strength
A. i and ii
B. i and iii
C. ii and iii
D. i, ii and iii
Answer» C. ii and iii
Discussion
19.

Which type of cable does not require bedding?
A. Paper insulated lead covered cables
B. PVC cables
C. Both (A) and (B)
D. None of these
Answer» C. Both (A) and (B)
Discussion
20.

How many outlets are permitted in a power circuit?
A. 10 points
B. 5 points
C. 2 points
D. 1 point
Answer» D. 1 point
Discussion
21.

What is the diameter of the GI pipe through which the earth wire needs to be taken out?
A. 13 mm diameter
B. 15 mm diameter
C. 19 mm diameter
D. 6 mm diameter
Answer» B. 15 mm diameter
Discussion
22.

Which among these is a type of internal wiring?
A. Cleat wiring
B. Conduit wiring
C. CTS wiring
D. Both (a) & (b)
E. All of these
Answer» F.
Discussion
23.

What should be the value of earthing resistance for large power stations?
A. 1 Ω
B. 0.5 Ω
C. 2 Ω
D. 5 Ω
Answer» C. 2 Ω
Discussion
24.

Branch circuit must not feed more than __________ points.
A. 12
B. 5
C. 10
D. 8
Answer» D. 8
Discussion
25.

Which set of rules are to be verified on completion of wiring on any new installation?
A. IE rules, 1950
B. IE rules, 1956
C. IE rules, 1960
D. None of these
Answer» C. IE rules, 1960
Discussion
26.

What is the maximum distance between the two successive cleats?
A. 0.25 m
B. 0.6 m
C. 0.9m
D. 1.25 m
Answer» C. 0.9m
Discussion
27.

For what voltage levels are the screwed conduit circuits used?
A. Less than 250 V
B. For voltages between 250 V – 600 V
C. For voltages above 600 V
D. None of these
Answer» C. For voltages above 600 V
Discussion
28.

Beyond what temperature does the gas vaporise and blackens the lamp in a gas filled lamp?
A. 550 ° C
B. 2000 ° C
C. 1000 ° C
D. 3000 ° C
Answer» C. 1000 ° C
Discussion
29.

Which among these is a type of batten wiring?
A. Using metal sheathed wiring
B. Using TRS or PVC wires
C. Both (A) and (B)
D. None of these
Answer» D. None of these
Discussion
30.

A black body when heated to ____________ emits the maximum energy in the visible spectrum range.
A. 5000 ° C
B. 3250 ° C
C. 6250 ° C
D. 8000 ° C
Answer» D. 8000 ° C
Discussion
31.

Which among these is a method of wiring?
A. Joint box
B. Tee system
C. Loop in system
D. Only a and c
E. All of these
Answer» F.
Discussion
32.

At what temperature value is the insulation resistance corrected if it is measured to be different?
A. 30 ° C
B. 25 ° C
C. 22 ° C
D. 15 ° C
Answer» C. 22 ° C
Discussion
33.

What is the maximum load that is permitted in a power circuit?
A. 5000 watts
B. 3000 watts
C. 2000 watts
D. 10000 watts
Answer» C. 2000 watts
Discussion
34.

What is the factor of safety used for current ratings in a power installation?
A. 1
B. 1.5
C. 1.75
D. 2
Answer» E.
Discussion
35.

What is the maximum length of the flexible conduit in motor installation?
A. Less than 1.25 m
B. Less than 2.25 m
C. Less than 3.5 m
D. Can exceed not more than 5 m.
Answer» B. Less than 2.25 m
Discussion
36.

What is the maximum number of lighting points that can be connected in a circuit?
A. 5
B. 10
C. 8
D. 12
Answer» C. 8
Discussion
37.

______ should be provided as the working space around the main switchboard according to IE rule 51.
A. 0.914 m
B. 0.523 m
C. 0.638 m
D. 0.814 m
Answer» B. 0.523 m
Discussion
38.

The leakage current must not be more than ____________ of maximum supply current
A. 1 / 1000
B. 1 / 100
C. 1 / 5000
D. 1 / 500
Answer» D. 1 / 500
Discussion
39.

What is the maximum load that can be connected in a circuit connecting only lighting points?
A. 500 watts
B. 750 watts
C. 800 watts
D. 1000 watts
Answer» D. 1000 watts
Discussion
40.

Which material is used for wiring continuous bus bar?
A. Aluminium
B. Copper
C. Both (A) and (B)
D. None of these
Answer» B. Copper
Discussion
41.

What is the empirical formula employed for the determination of spacing of conductors in case of aluminium conductors?
A. √S + V / 100
B. √S + 120 / V
C. √S + V / 150
D. √S + V / 1 kV
Answer» D. √S + V / 1 kV
Discussion
42.

What should be the minimum insulation resistance of a 11 kV line when tested with a 1000 v Megger?
A. 10 kV
B. 50 kV
C. 33 kV
D. 120 kV
Answer» C. 33 kV
Discussion
43.

What is the angle between the pole and stay?
A. 30 °
B. 45 °
C. 60 °
D. 10 °
Answer» B. 45 °
Discussion
44.

What should be the insulation resistance in case of PVC wires?
A. 12.5 MΩ / number of outlet
B. 82.5 MΩ / number of outlet
C. 2.5 MΩ / number of outlet
D. 10.5 MΩ / number of outlet
Answer» B. 82.5 MΩ / number of outlet
Discussion
45.

What is the formula to calculate the number of poles required in LT line distribution?
A. Length / Span + 1
B. Length / Span + 10
C. Span / Length + 1
D. Span / Length + 10
Answer» B. Length / Span + 10
Discussion
46.

Which starter is used for slip ring induction motors of high ratings?
A. DOL starter
B. Rotor resistance starter
C. Autotransformer starter
D. All of these
E. None of these
Answer» C. Autotransformer starter
Discussion
47.

Which lamp is used in the outdoor illumination of buildings and airport runway?
A. Halogen lamp
B. Gaseous discharge lamp
C. Sodium vapour lamp
D. All of these
Answer» B. Gaseous discharge lamp
Discussion
48.

How is the ballast resistance connected with the choke?
A. Parallel
B. Series
C. Can be connected in either way
D. Both (a) & (b)
E. None of these
Answer» C. Can be connected in either way
Discussion
49.

What is the normal life of a fluorescent lamp?
A. 2000 hours
B. 3500 hours
C. 7500 hours
D. 10000 hours
Answer» D. 10000 hours
Discussion
50.

What is the size of the cable made up of copper conductors used for a 10 hp 500 V DC motor?
A. 7 / 0.915 mm
B. 1 / 2.8 mm
C. 3 / 0.915 mm
D. Both (b) & (c)
E. All of these
Answer» B. 1 / 2.8 mm
Discussion