Cables and Connectors Objective Type Questions and Answers

Questions

21 In cables the charging current

A leads the voltage by 90°

B leads the voltage by 180°

C lags the voltage by 90°

D lags the voltage by 180°

View Answer

Answer: leads the voltage by 90°

22 If the length of a cable is doubled, its capacitance

A becomes double

B becomes one-half

C becomes one-fourth

D remains unchanged

View Answer

Answer: becomes double

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23 Solid type cables are considered unreliable beyond 66 kV because

A there is a danger of breakdown of insulation due to the presence of voids

B insulation may melt due to higher temperature

C skin effect dominates on the conductor

D of corona loss between conductor and sheath material

View Answer

Answer: there is a danger of breakdown of insulation due to the presence of voids

24 The relative permittivity of rubber is

A between 12 and 14

B between 8 and 10

C between 2 and 3

D None of given

View Answer

Answer: between 2 and 3

25 The material for armouring on cable is usually

A any of the above

B galvanised steel wire

C steel tape

D none of the above

View Answer

Answer: any of the above

26 PVC stands for

A polyvinyl chloride

B post varnish conductor

C pressed and varnished cloth

D None of the above

View Answer

Answer: polyvinyl chloride

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

A the capacitances of insulated conductors

B the inductance of conductors

C the resistance of the conductor

D all above parameters

View Answer

Answer: the capacitances of insulated conductors

28 In capacitance grading of cables we use a ______ dielectric.

A composite

B homogeneous

C hygroscopic

D porous

View Answer

Answer: composite

29 Cables, generally used beyond 66 kV are

A oil filled

B belted

C S.L. type

D None of the above

View Answer

Answer: oil filled

30 The surge resistance of cable is

A 50 ohms

B 5 ohms

C 20 ohms

D 100 ohms

View Answer

Answer: 50 ohms

31 In a cable, the maximum stress under operating conditions is at

A conductor surface

B armour

C insulation layer

D sheath

View Answer

Answer: conductor surface

32 Low tension cables are generally used up to

A 700 V

B 1000 V

C 200 V

D 500 V

View Answer

Answer: 1000 V

33 The minimum dielectric stress in a cable is at

A lead sheath

B conductor surface

C armour

D none of the above

View Answer

Answer: lead sheath

34 Conduit pipes are normally used to protect _____ cables.

A unsheathed cables

B armoured

C PVC sheathed cables

D all of the above

View Answer

Answer: unsheathed cables

35 High tension cables are generally used up to

A 11kV

B 33kV

C 66 kV

D 132 kV

View Answer

Answer: 11kV

36 In a cable the voltage stress is maximum at

A surface of the conductor

B core of the conductor

C sheath

D insulator

View Answer

Answer: core of the conductor

37 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 None of the above

View Answer

Answer: 0.04 mm

38 Copper as conductor for cables is used as

A annealed

B hardened and tempered

C hard drawn

D alloy with chromium

View Answer

Answer: annealed

39 The advantage of oil filled cables is

A no ionisation, oxidation and formation of voids

B more perfect impregnation

C smaller overall size

D all of the above

View Answer

Answer: all of the above

40 In case of three core flexible cable the colour of the neutral is

A blue

B brown

C black

D none of the above

View Answer

Answer: blue

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