Cables and Connectors Quiz | Cables and Connectors Multiple Choice Questions and Answers

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Questions
1 Empire tape is
A varnished cambric
B vulcanised rubber
C impregnated paper
D none of the above

Answer: varnished cambric
2 The bedding on a cable consists of
A hessian cloth
B jute
C any of the above
D none of the above

Answer: any of the above
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3 The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
A smaller dielectric loss
B non-existence of any stability limit
C absence of harmonics
D absence of ripples

Answer: smaller dielectric loss
4 cables are used for 132 kV lines.
A Extra super voltage
B Extra high tension
C High tension
D None of given

Answer: Extra super voltage
5 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: avoid excessive sheath losses
6 Dielectric strength of rubber is around
A 30 kV/mm
B 200 kV/mm
C 5 kV/mm
D None of the above

Answer: 30 kV/mm
7 Underground cables are laid at sufficient depth
A to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
B for all of the above reasons
C to minimise temperature stresses
D to avoid being unearthed easily due to removal of soil

Answer: to minimise the effect of shocks and vibrations due to gassing vehicles, etc
8 Cables for 220 kV lines are invariably
A compressed oil or compressed gas insulated
B rubber insulated
C mica insulated
D paper insulated

Answer: compressed oil or compressed gas insulated
9 Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
A Compressed SFe gas
B Polyvinyle chloride
C Impregnated paper
D None of the above

Answer: Compressed SFe gas
10 The insulating material should have
A high dielectric strength
B low permittivity
C high resistivity
D all of the above

Answer: all of the above
11 The disadvantage with paper as insulating material is
A it is hygroscopic
B it is an organic material
C it has high capacitance
D none of the above

Answer: it is hygroscopic
12 The breakdown voltage of a cable depends on
A working temperature
B time of application of the voltage
C presence of moisture
D all of the above

Answer: all of the above
13 Capacitance grading of cable implies
A use of dielectrics of different permeabilities
B capacitance required to be introduced at different lengths to counter the effect of inductance
C grading according to capacitance of cables per km length
D none of the above

Answer: use of dielectrics of different permeabilities
14 The advantage of cables over overhead transmission lines is
A can be used in congested areas
B low cost
C easy maintenance
D can be used in high voltage circuits

Answer: can be used in congested areas
15 A cable carrying alternating current has
A hysteresis and leakage losses only
B hysteresis losses only
C hysteresis, leakage, copper and friction losses
D hysteresis, leakage and copper losses only

Answer: hysteresis and leakage losses only
16 The electrostatic stress in underground cables is
A maximum at the conductor and minimum at the sheath
B same at the conductor and the sheath
C zero at the conductor as well as on the sheath
D minimum at the conductor and maximum at the sheath

Answer: maximum at the conductor and minimum at the sheath
17 In the cables, sheaths are used to
A provide proper insulation
B prevent the moisture from entering the cable
C provide enough strength
D None of the above

Answer: prevent the moisture from entering the cable
18 The intersheaths in the cables are used to
A provide proper stress distribution
B avoid the requirement of good insulation
C minimize the stress
D none of the above

Answer: provide proper stress distribution
19 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 Both a and b
D None of given

Answer: the increase in length of the insulation
20 If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
A 10 kV/mm
B 15 kV/mm
C 5 kV/mm
D 30 kV/mm

Answer: 10 kV/mm

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