Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 715 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.

What is the value of energy distance in case of two parallel conductors?
A. (r + 0.301 * √ r)
B. (r + 0.308 * √ r)
C. (r + 0.501 * √ r)
D. (r + 0.508 * √ r)
Answer» B. (r + 0.308 * √ r)
Discussion
2.

What is the minimum safety factor in respect of the conductor tension?
A. 1
B. 3
C. 2
D. 1.5
Answer» D. 1.5
Discussion
3.

Assertion (A): 3 wire dc distribution system is preferred over 2 wire dc distribution system. Reason (R): the 3 wire dc system of distribution is more safe.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» D. A is false but R is true
Discussion
4.

Assertion (A): Transmission of electrical power by dc is economical than that with ac. Reason (R): In case of dc transmission, there is no charging current which contributes to the continuous load, even on no load.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
5.

Which type of system is generally adopted for the generation and transmission of electrical power?
A. 3 phase 4 wire
B. 2 phase 3 wire
C. 3 phase 3 wire
D. None of these
Answer» D. None of these
Discussion
6.

The generating voltage and frequency in India is about?
A. 11 kV and 60 Hz
B. 11 kV and 50 Hz
C. 220 kV and 60 Hz
D. 220 kV and 50 Hz
Answer» C. 220 kV and 60 Hz
Discussion
7.

The rated voltage of a 3 phase power system is given by ____________.
A. rms peak voltage
B. Peak phase voltage
C. rms line to line voltage
D. Peak line to line voltage
Answer» D. Peak line to line voltage
Discussion
8.

Which among these is/are the fundamental economical principles that influence/s the design of transmission lines?
A. Economic choice of conductor size.
B. Economic choice of transmission voltage.
C. Both (a) and (b)
D. Economic choice of transmission line length.
Answer» D. Economic choice of transmission line length.
Discussion
9.

Which of these systems uses the 3 phase 4 wire system?
A. Primary distribution
B. Secondary distribution
C. Primary transmission
D. Secondary transmission
Answer» C. Primary transmission
Discussion
10.

The most important disadvantage of using the high voltage for transmission is
A. The increased cost of insulating the conductors.
B. The increased cost of transformers, switchgear and the other terminal apparatus.
C. Both (a) and (b)
D. There is a reduction in the corona loss.
Answer» D. There is a reduction in the corona loss.
Discussion
11.

The most economical area of conductor is that for which the total annual cost of transmission line is minimum. Which law states this?
A. Lenz’s law
B. Kelvin’s law
C. Faraday’s law
D. Ohm’s law
Answer» C. Faraday’s law
Discussion
12.

For the same conductor length, same amount of power, same losses and maximum voltage to earth, which system requires minimum conductor area?
A. 3 wire ac
B. 2 wire ac
C. 2 wire dc
D. Single phase
Answer» B. 2 wire ac
Discussion
13.

The most suitable practical value of primary distribution is?
A. 66 kV
B. 6.6 kV
C. 230 V/ 400 V
D. 22 kV
Answer» C. 230 V/ 400 V
Discussion
14.

What is the main drawback of overhead system over underground system?
A. Surge problem
B. High initial cost
C. Higher charging current
D. Underground system is more flexible than overhead system
Answer» B. High initial cost
Discussion
15.

What is the highest possible transmission voltage in India?
A. 675 kV
B. 765 kV
C. 132 kV
D. 440 kV
Answer» C. 132 kV
Discussion
16.

What is the main reason for using the high voltage for the long distance power transmission?
A. Reduction in the transmission losses
B. Reduction in the time of transmission
C. Increase in system reliability
D. None of these
Answer» B. Reduction in the time of transmission
Discussion
17.

By increasing the transmission voltage double of its original value, the same power can be despatched keeping the line losses _______________.
A. Equal to its original value.
B. Half of its original value.
C. Double the original value.
D. One - fourth of the original value.
Answer» E.
Discussion
18.

The account of interest and depreciation on the capital cost of complete installation of transmission line is denoted by which factor?
A. Annual charge on capital outlay
B. Annual cost of energy wasted
C. Both (a) and (b)
D. Neither of these
Answer» B. Annual cost of energy wasted
Discussion
19.

With the same maximum voltage to earth, which among the following AC systems with 0.8 pf will need more copper compared to 2 wire system?
A. Single phase, 2 wire
B. Single phase, 3 wire
C. Three phase, 3 wire
D. Three phase, 4 wire
Answer» E.
Discussion
20.

In transmission system, the weight of copper used is proportional to
A. Square of voltage
B. Voltage
C. 1 / (square of voltage)
D. 1 / voltage
Answer» D. 1 / voltage
Discussion
21.

Greater the power factor the ________________ is the volume of copper required.
A. Greater
B. Smaller
C. Both are equal
D. Depending of the level of transmission
Answer» C. Both are equal
Discussion
22.

Line efficiency increases for ________ transmission voltages.
A. Higher
B. Lower
C. Both (a) and (b)
D. None of these
Answer» B. Lower
Discussion
23.

What is the maximum permissible limit of voltage for the line supports?
A. 30 kV
B. 20 kV
C. 11 kV
D. 44 kV
Answer» C. 11 kV
Discussion
24.

Transmission of power by ac cables is impossible beyond
A. 35 – 45 km
B. 500 km
C. 300 km
D. 10 – 15 km
Answer» B. 500 km
Discussion
25.

What is the value of B parameter in case of nominal p method?
A. Y
B. Z
C. Y * (1 + YZ / 4)
D. Z * (1 + YZ / 4)
Answer» C. Y * (1 + YZ / 4)
Discussion
26.

What does the bedding on the cable consists of?
A. Jute strands
B. Jute strands
C. Paper tape compounded with a fibrous material
D. Any of these
Answer» E.
Discussion
27.

When is the Ferranti effect on the long transmission lines experienced?
A. The line is lightly loaded.
B. The line is heavily loaded.
C. The line is fully loaded.
D. The power factor is unity.
Answer» B. The line is heavily loaded.
Discussion
28.

Why are sheaths used in cables?
A. Provide proper insulation
B. Provide mechanical strength
C. Prevent ingress of moisture
D. None of these
Answer» D. None of these
Discussion
29.

What is the maximum stress in the insulation for a 33 kV single core cable with a diameter of 1 cm and a sheath of inside diameter 4 cm?
A. 50.61 kV / cm rms
B. 45.231 kV / cm rms
C. 47.61 kV / cm rms
D. 49.231 kV /cm rms
Answer» D. 49.231 kV /cm rms
Discussion
30.

What happens in a long transmission lines under no load?
A. The receiving end voltage is less than the sending end voltage.
B. The sending end voltage is less then receiving end voltage.
C. The sending end voltage is equal to receiving end voltage.
D. None of these
Answer» C. The sending end voltage is equal to receiving end voltage.
Discussion
31.

Which among the following methods are used for the calculation of solution of a medium transmission line?
A. End condenser method
B. Only T method
C. Only p method
D. All of these
Answer» E.
Discussion
32.

Why are the inter sheaths in cables used?
A. Provides proper stress distribution
B. Minimises the stress
C. Provides protection against moisture, current and voltage surges
D. To improve the insulation
Answer» B. Minimises the stress
Discussion
33.

Why are conduit pipes employed?
A. To protect unsheathed cables
B. Armoured cables
C. PVC sheathed cables
D. All of these
Answer» B. Armoured cables
Discussion
34.

Armouring is provided above the bedding. The armouring consists of one or two layers of which wire or tape?
A. Galvanised steel wire
B. Thin wires of copper
C. Wires of aluminium
D. Wire made of both copper and cadmium
Answer» B. Thin wires of copper
Discussion
35.

What will be the insulation thickness for a conductor of diameter 2 cm, with maximum and minimum stress 40 kV / cm rms and 10 kV / cm rms respectively?
A. 5 cm
B. 3 cm
C. 2 cm
D. 4 cm
Answer» C. 2 cm
Discussion
36.

The thickness of insulation layer provided on the conductor, in cables depend on_______.
A. Operating voltage
B. Current to be carried
C. Power factor
D. All of these
Answer» B. Current to be carried
Discussion
37.

The transmission lines above what length is termed as the long lines?
A. More than 100 km
B. 150 km and above
C. 250 km and above
D. Less than 100 km
Answer» C. 250 km and above
Discussion
38.

The ABCD parameter of a 3 phase transmission line is given as follows A = D = 0.8 ∠ 1 °, B = 170 ∠ 85 ° Ω , and C = 0.002 ∠ 90.4 ° ℧ the sending end voltage is 400 kV. What is the receiving end voltage under no load condition?
A. 400 kV
B. 500 kV
C. 320 kV
D. 417 kV
Answer» C. 320 kV
Discussion
39.

What is the purpose of bedding on the underground cables?
A. To avoid leakage of current.
B. To protect the sheath against corrosion.
C. To protect the sheath from mechanical injury due to armouring.
D. Both (b) and (c)
Answer» E.
Discussion
40.

What is the main purpose for guy wire?
A. Supports the pole
B. Protects against the surges
C. Provides emergency earth route
D. All of these
Answer» B. Protects against the surges
Discussion
41.

When does the Ferranti effect happen on the transmission line?
A. When the line is short and loaded.
B. When the line is long and loaded.
C. When the line is long and unloaded.
D. None of these.
Answer» D. None of these.
Discussion
42.

A layer similar to bedding is provided on the armouring to protect the whole cable from all atmospheric conditions. Which layer is this?
A. Insulation
B. A layer of jute
C. Serving
D. Sheath
Answer» D. Sheath
Discussion
43.

In the nominal p method which among these are divided into two halves?
A. Series impedance
B. Shunt capacitance
C. Both (A) and (B)
D. None of these
Answer» C. Both (A) and (B)
Discussion
44.

Transmission efficiency of a transmission line increases with the ____________.
A. decrease in power factor and voltage.
B. increase in power factor and voltage.
C. increase in power factor but decrease in voltage.
D. increase in voltage and decrease in power factor.
Answer» C. increase in power factor but decrease in voltage.
Discussion
45.

What is the normal range of angle for the parameter A?
A. 90 °
B. 70 ° - 40 °
C. 40 ° - 10 °
D. 0 - 10 °
Answer» E.
Discussion
46.

The value of A parameter of a transmission line
A. Increases with increase in length of line
B. Decreases with increase in line length
C. Is independent of line length
D. None of these
Answer» B. Decreases with increase in line length
Discussion
47.

What is the usual span of the RCC poles?
A. 250 – 400 m.
B. 80 – 150 m.
C. 50 – 105 m.
D. 10 – 75 m.
Answer» C. 50 – 105 m.
Discussion
48.

Which among these is not a type of steel poles?
A. Rail poles
B. Tubular poles
C. Rolled steel joints
D. None of these
Answer» E.
Discussion
49.

Steel poles are painted so as to prevent it from ____________.
A. Corrosion
B. Borer
C. Termites
D. All of these
Answer» B. Borer
Discussion
50.

Sag depends on which factor?
A. Span length
B. Weight of the conductors
C. Tension in the conductors
D. All of these
Answer» E.
Discussion