Underground cables are laid at sufficient depth

To minimize temperature stresses

To avoid being unearthed easily due to removal of soil

To minimize the effect of shocks and vibrations due to gassing vehicles, etc.

In the cables, the location of fault is usually found out by comparing~!

The resistance of the conductor

The capacitances of insulated conductors

The breakdown voltage of a cable depends on%!

Time of application of the voltage

The insulation of the cable decreases with%!

The decrease in the length of the insulation

The increase in length of the insulation

The decrease in the length of the insulation

Cables for 220 kV lines are invariably%!

Compressed oil or compressed gas insulated

The advantage of cables over overhead transmission lines is%!

Can be used in high voltage circuits

Underground cables are laid at sufficient depth%!

To minimize temperature stresses

To avoid being unearthed easily due to removal of soil

To minimize the effect of shocks and vibrations due to gassing vehicles, etc.

Solid type cables are considered unreliable beyond 66 kV because%!

Insulation may melt due to higher temperature

Skin effect dominates on the conductor

Of corona loss between conductor and sheath material

There is a danger of breakdown of insulation due to the presence of voids

The advantage of oil filled cables is%!

No ionization, oxidation and formation of voids

A cable carrying alternating current has%!

Hysteresis, leakage and copper losses only

Hysteresis and leakage losses only

Hysteresis, leakage and copper losses only

Hysteresis, leakage, copper and friction losses

The electrostatic stress in underground cables is%!

Zero at the conductor as well as on the sheath

Same at the conductor and the sheath

Minimum at the conductor and maximum at the sheath

Maximum at the conductor and minimum at the sheath

Zero at the conductor as well as on the sheath

The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to%!

Nonexistence of any stability limit

Capacitance grading of cable implies%!

Grading according to capacitance of cables per km length

Use of dielectrics of different permeabilities

Grading according to capacitance of cables per km length

Cables using single dielectric in different concentrations

Capacitance required to be introduced at different lengths to counter the effect of inductance

*$_Capacitance grading of cable implies?

Grading according to capacitance of cables per km length

Use of dielectrics of different permeabilities

Grading according to capacitance of cables per km length

Cables using single dielectric in different concentrations

Capacitance required to be introduced at different lengths to counter the effect of inductance

121 + Mcqs in Electrical Cables in Electrical Engineering Page 2 McqOptions

51.	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

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

Discussion

53.	Underground cables are laid at sufficient depth
A.	To minimize temperature stresses
B.	To avoid being unearthed easily due to removal of soil
C.	To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
D.	For all of the above reasons
Answer» D. For all of the above reasons

Discussion

54.	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

55.	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

56.	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

57.	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

58.	Polyethylene has very poor dielectric and ageing properties.%!
A.	Yes
B.	No
Answer» C.

Discussion

59.	The insulating material should have%!
A.	Low permittivity
B.	High resistivity
C.	High dielectric strength
D.	All of the above
Answer» E.

Discussion

60.	High tension cables are generally used up to%!
A.	11 kV
B.	33 kV
C.	66 kV
D.	132 kV
Answer» B. 33 kV

Discussion

61.	In case of three core flexible cable the color of the neutral is%!
A.	Blue
B.	Black
C.	Brown
D.	None of the above
Answer» B. Black

Discussion

62.	The surge resistance of cable is%!
A.	5 ohms
B.	20 ohms
C.	50 ohms
D.	100 ohms
Answer» D. 100 ohms

Discussion

63.	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

64.	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

65.	The metallic sheath may be made of lead or lead alloy or of aluminum.%!
A.	Yes
B.	No
Answer» C.

Discussion

66.	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

67.	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

68.	Cables, generally used beyond 66 kV are%!
A.	Oil filled
B.	S.L. type
C.	Belted
D.	Armoured
Answer» B. S.L. type

Discussion

69.	In capacitance grading a homogeneous dielectric is used.%!
A.	Yes
B.	No
Answer» C.

Discussion

70.	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

71.	Cables for 220 kV lines are invariably%!
A.	Mica insulated
B.	Paper insulated
C.	Compressed oil or compressed gas insulated
D.	Rubber insulated
Answer» D. Rubber insulated

Discussion

72.	The minimum dielectric stress in a cable is at%!
A.	Armour
B.	Bedding
C.	Conductor surface
D.	Lead sheath
Answer» E.

Discussion

73.	The thickness of metallic shielding on cables is usually%!
A.	0.04 mm
B.	0.2 to 0.4 mm
C.	3 to 5 mm
D.	40 to 60 mm
Answer» D. 40 to 60 mm

Discussion

74.	The advantage of cables over overhead transmission lines is%!
A.	Easy maintenance
B.	Low cost
C.	Can be used in congested areas
D.	Can be used in high voltage circuits
Answer» D. Can be used in high voltage circuits

Discussion

75.	Underground cables are laid at sufficient depth%!
A.	To minimize temperature stresses
B.	To avoid being unearthed easily due to removal of soil
C.	To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
D.	For all of the above reasons
Answer» D. For all of the above reasons

Discussion

76.	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

77.	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

78.	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

79.	The advantage of oil filled cables is%!
A.	More perfect impregnation
B.	Smaller overall size
C.	No ionization, oxidation and formation of voids
D.	All of the above
Answer» E.

Discussion

80.	PVC stands for%!
A.	Polyvinyl chloride
B.	Post varnish conductor
C.	Pressed and varnished cloth
D.	Positive voltage conductor
Answer» B. Post varnish conductor

Discussion

81.	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

82.	Pressure cables are generally not used beyond%!
A.	11 kV
B.	33 kV
C.	66 kV
D.	132 kV
Answer» D. 132 kV

Discussion

83.	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

84.	A cable carrying alternating current has%!
A.	Hysteresis losses only
B.	Hysteresis and leakage losses only
C.	Hysteresis, leakage and copper losses only
D.	Hysteresis, leakage, copper and friction losses
Answer» C. Hysteresis, leakage and copper losses only

Discussion

85.	Rubber is most commonly used insulation in cables.%!
A.	Yes
B.	No
Answer» B. No

Discussion

86.	Natural rubber is obtained from milky sap of tropical trees.%!
A.	Yes
B.	No
Answer» B. No

Discussion

87.	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

88.	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
Answer» D. Zero at the conductor as well as on the sheath

Discussion

89.	Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?%!
A.	Polyvinyle chloride
B.	Vulcanised rubber
C.	Impregnated paper
D.	Compressed SFe gas
E.	none of the above
Answer» E. none of the above

Discussion

90.	It is difficult to maintain oil filled cables.%!
A.	Yes
B.	No
Answer» B. No

Discussion

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

Discussion

92.	The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to%!
A.	Absence of harmonics
B.	Nonexistence of any stability limit
C.	Smaller dielectric loss
D.	Absence of ripples
Answer» D. Absence of ripples

Discussion

93.	Capacitance grading of cable implies%!
A.	Use of dielectrics of different permeabilities
B.	Grading according to capacitance of cables per km length
C.	Cables using single dielectric in different concentrations
D.	Capacitance required to be introduced at different lengths to counter the effect of inductance
Answer» B. Grading according to capacitance of cables per km length

Discussion

94.	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

95.	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

96.	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

97.	*$_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

98.	*$_Capacitance grading of cable implies?
A.	Use of dielectrics of different permeabilities
B.	Grading according to capacitance of cables per km length
C.	Cables using single dielectric in different concentrations
D.	Capacitance required to be introduced at different lengths to counter the effect of inductance
Answer» B. Grading according to capacitance of cables per km length

Discussion

99.	*$_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

100.	*$_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

Explore topic-wise MCQs in Electrical Engineering.

Dielectric strength of rubber is around

In capacitance grading a homogeneous dielectric is used.

Underground cables are laid at sufficient depth

The insulating material for a cable should have

The bedding on a cable consists of

In single core cables armouring is not done to~!

In the cables, the location of fault is usually found out by comparing~!

Polyethylene has very poor dielectric and ageing properties.%!

The insulating material should have%!

High tension cables are generally used up to%!

In case of three core flexible cable the color of the neutral is%!

The surge resistance of cable is%!

Dielectric strength of rubber is around%!

The thickness of the layer of insulation on the conductor, in cables, depends upon%!

The metallic sheath may be made of lead or lead alloy or of aluminum.%!

The breakdown voltage of a cable depends on%!

Copper as conductor for cables is used as%!

Cables, generally used beyond 66 kV are%!

In capacitance grading a homogeneous dielectric is used.%!

The insulation of the cable decreases with%!

Cables for 220 kV lines are invariably%!

The minimum dielectric stress in a cable is at%!

The thickness of metallic shielding on cables is usually%!

The advantage of cables over overhead transmission lines is%!

Underground cables are laid at sufficient depth%!

Solid type cables are considered unreliable beyond 66 kV because%!

If the length of a cable is doubled, its capacitance%!

In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.%!

The advantage of oil filled cables is%!

PVC stands for%!

The insulating material for a cable should have%!

Pressure cables are generally not used beyond%!

If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be%!

A cable carrying alternating current has%!

Rubber is most commonly used insulation in cables.%!

Natural rubber is obtained from milky sap of tropical trees.%!

The bedding on a cable consists of%!

The electrostatic stress in underground cables is%!

Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?%!

It is difficult to maintain oil filled cables.%!

Which of the following insulation is used in cables?%!

The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to%!

Capacitance grading of cable implies%!

If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be%!

The insulating material for cables should%!

The relative permittivity of rubber is%!

*$_The insulating material for cables should?

*$_Capacitance grading of cable implies?

*$_If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be?

*$_The relative permittivity of rubber is?