Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 57 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.

The minimum dielectric stress in a cable is at_____________?
A. armour
B. bedding
C. conductor surface
D. lead sheath
Answer» E.
Discussion
2.

In case of three core flexible cable the colour of the neutral is_________?
A. blue
B. black
C. brown
D. none of the above
Answer» B. black
Discussion
3.

In cables the charging current__________?
A. lags the voltage by 90°
B. leads the voltage by 90°
C. lags the voltage by 180°
D. leads the voltage by 180°
Answer» C. lags the voltage by 180°
Discussion
4.

cables are used for 132 kV lines____________?
A. High tension
B. Super tension
C. Extra high tension
D. Extra super voltage
Answer» E.
Discussion
5.

If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
A. 5 kV/mm
B. 10 kV/mm
C. 15 kV/mm
D. 30 kV/mm
Answer» C. 15 kV/mm
Discussion
6.

The insulating material for a cable should have__________?
A. low cost
B. high dielectric strength
C. high mechanical strength
D. all of the above
Answer» E.
Discussion
7.

A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
A. one half
B. double
C. four times
D. none of the above
Answer» B. double
Discussion
8.

The relative permittivity of rubber is____________?
A. between 2 and 3
B. between 5 and 6
C. between 8 and 10
D. between 12 and 14
Answer» B. between 5 and 6
Discussion
9.

Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above
Answer» E.
Discussion
10.

The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
A. reactive power
B. power factor
C. voltage
D. current carrying capacity
Answer» D. current carrying capacity
Discussion
11.

In capacitance grading of cables we use a _______ dielectric?
A. composite
B. porous
C. homogeneous
D. hygroscopic
Answer» B. porous
Discussion
12.

Which of the following protects a cable against mechanical injury___________?
A. Bedding
B. Sheath
C. Armouring
D. None of the above
Answer» D. None of the above
Discussion
13.

PVC stands for____________?
A. polyvinyl chloride
B. post varnish conductor
C. pressed and varnished cloth
D. positive voltage conductor
E. none of the above
Answer» B. post varnish conductor
Discussion
14.

Solid type cables are considered unreliable beyond 66 kV because___________?
A. insulation may melt due to higher temperature
B. skin effect dominates on the conductor
C. of corona loss between conductor and sheath material
D. there is a danger of breakdown of insulation due to the presence of voids
Answer» E.
Discussion
15.

Conduit pipes are normally used to protect _______ cables
A. unsheathed cables
B. armoured
C. PVC sheathed cables
D. all of the above
Answer» B. armoured
Discussion
16.

Pressure cables are generally not used beyond__________?
A. 11 kV
B. 33 kV
C. 66 kV
D. 132 kV
Answer» D. 132 kV
Discussion
17.

The material for armouring on cable is usually__________?
A. steel tape
B. galvanised steel wire
C. any of the above
D. none of the above
Answer» D. none of the above
Discussion
18.

Dielectric strength of rubber is around____________?
A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm
Answer» D. 200 kV/mm
Discussion
19.

In single core cables armouring is not done to________?
A. avoid excessive sheath losses
B. make it flexible
C. either of the above
D. none of the above
Answer» B. make it flexible
Discussion
20.

High tension cables are generally used up to_____________?
A. 11kV
B. 33kV
C. 66 kV
D. 132 kV
Answer» B. 33kV
Discussion
21.

In a cable, the maximum stress under operating conditions is at___________?
A. insulation layer
B. sheath
C. armour
D. conductor surface
Answer» E.
Discussion
22.

Low tension cables are generally used up to___________?
A. 200 V
B. 500 V
C. 700 V
D. 1000 V
Answer» E.
Discussion
23.

In the cables, the location of fault is usually found out by comparing____________?
A. the resistance of the conductor
B. the inductance of conductors
C. the capacitances of insulated conductors
D. all above parameters
Answer» D. all above parameters
Discussion
24.

Cables, generally used beyond 66 kV are___________?
A. oil filled
B. S.L. type
C. belted
D. armoured
Answer» B. S.L. type
Discussion
25.

The insulating material for cables should____________?
A. be acid proof
B. be non-inflammable
C. be non-hygroscopic
D. have all above properties
Answer» E.
Discussion
26.

The surge resistance of cable is__________?
A. 5 ohms
B. 20 ohms
C. 50 ohms
D. 100 ohms
Answer» D. 100 ohms
Discussion
27.

The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?
A. absence of harmonics
B. non-existence of any stability limit
C. smaller dielectric loss
D. absence of ripples
E. none of the above
Answer» D. absence of ripples
Discussion
28.

The bedding on a cable consists of____________?
A. hessian cloth
B. jute
C. any of the above
D. none of the above
Answer» D. none of the above
Discussion
29.

In a cable immediately above metallic sheath ______ is provided
A. earthing connection
B. bedding
C. armouring
D. none of the above
Answer» C. armouring
Discussion
30.

Empire tape is__________?
A. varnished cambric
B. vulcanised rubber
C. impregnated paper
D. none of the above
Answer» B. vulcanised rubber
Discussion
31.

The electrostatic stress in underground cables is_________?
A. same at the conductor and the sheath
B. minimum at the conductor and maximum at the sheath
C. maximum at the conductor and minimum at the sheath
D. zero at the conductor as well as on the sheath
E. none of the above
Answer» D. zero at the conductor as well as on the sheath
Discussion
32.

The disadvantage with paper as insulating material is____________?
A. it is hygroscopic
B. it has high capacitance
C. it is an organic material
D. none of the above
Answer» B. it has high capacitance
Discussion
33.

The insulating material should have____________?
A. low permittivity
B. high resistivity
C. high dielectric strength
D. all of the above
Answer» E.
Discussion
34.

Rubber is most commonly used insulation in cables
A. Yes
B. No
Answer» B. No
Discussion
35.

Copper as conductor for cables is used as________?
A. annealed
B. hardened and tempered
C. hard drawn
D. alloy with chromium
Answer» B. hardened and tempered
Discussion
36.

If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
A. 2 cm
B. 10 cm
C. 50 cm
D. 400 cm
Answer» D. 400 cm
Discussion
37.

The advantage of oil filled cables is_________?
A. more perfect impregnation
B. smaller overall size
C. no ionisation, oxidation and formation of voids
D. all of the above
Answer» E.
Discussion
38.

Cables for 220 kV lines are invariably____________?
A. mica insulated
B. paper insulated
C. compressed oil or compressed gas insulated
D. rubber insulated
E. none of the above
Answer» D. rubber insulated
Discussion
39.

The breakdown voltage of a cable depends on_____________?
A. presence of moisture
B. working temperature
C. time of application of the voltage
D. all of the above
Answer» E.
Discussion
40.

The intersheaths in the cables are used to_____________?
A. minimize the stress
B. avoid the requirement of good insulation
C. provide proper stress distribution
D. none of the above
Answer» D. none of the above
Discussion
41.

In the cables, sheaths are used to___________?
A. prevent the moisture from entering the cable
B. provide enough strength
C. provide proper insulation
D. none of the above
Answer» B. provide enough strength
Discussion
42.

The breakdown of insulation of the cable can be avoided economically by the use of___________?
A. inter-sheaths
B. insulating materials with different dielectric constants
C. both (A) and (B)
D. none of the above
Answer» D. none of the above
Discussion
43.

If the length of a cable is doubled, its capacitance____________?
A. becomes one-fourth
B. becomes one-half
C. becomes double
D. remains unchanged
Answer» D. remains unchanged
Discussion
44.

The metallic sheath may be made of lead or lead alloy or of aluminium ?
A. Yes
B. No
Answer» C.
Discussion
45.

It is difficult to maintain oil filled cables____________?
A. Yes
B. No
Answer» B. No
Discussion
46.

In congested areas where excavation is expensive and inconvenient ‘draw in system’ of laying of underground cables is often adopted
A. Yes
B. No
Answer» B. No
Discussion
47.

Natural rubber is obtained from milky sap of tropical trees
A. Yes
B. No
Answer» B. No
Discussion
48.

Polyethylene has very poor dielectric and ageing properties
A. Yes
B. No
Answer» C.
Discussion
49.

In capacitance grading a homogeneous dielectric is used
A. Yes
B. No
Answer» C.
Discussion
50.

The insulation of the cable decreases with__________?
A. the increase in length of the insulation
B. the decrease in the length of the insulation
C. either A. or (b)
D. none of the above
Answer» B. the decrease in the length of the insulation
Discussion