Cables and Connectors Quiz | Cables and Connectors Objective Type Questions and Answers

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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°

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

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

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

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

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

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

Answer: the capacitances of insulated conductors
28 In capacitance grading of cables we use a ______ dielectric.
A composite
B homogeneous
C hygroscopic
D porous

Answer: composite
29 Cables, generally used beyond 66 kV are
A oil filled
B belted
C S.L. type
D None of the above

Answer: oil filled
30 The surge resistance of cable is
A 50 ohms
B 5 ohms
C 20 ohms
D 100 ohms

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

Answer: conductor surface
32 Low tension cables are generally used up to
A 700 V
B 1000 V
C 200 V
D 500 V

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

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

Answer: unsheathed cables
35 High tension cables are generally used up to
A 11kV
B 33kV
C 66 kV
D 132 kV

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

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

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

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

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

Answer: blue
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