Cables Quiz | Cables Objective Type Questions and Answers

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Questions
21 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: maximum at the conductor and minimum at the sheath
22 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: the increase in length of the insulation
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23 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: hysteresis and leakage losses only

Electrical Cables – Multiple Choice Questions with Answers | EBook

24 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 none of the above

Answer: use of dielectrics of different permeabilities
25 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: blue
26 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: can be used in congested areas
27 Cables for 220 kV lines are invariably
A mica insulated
B paper insulated
C compressed oil or compressed gas insulated
D rubber insulated

Answer: compressed oil or compressed gas insulated
28 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

Answer: Compressed SFe gas
29 Copper as conductor for cables is used as
A annealed
B hardened and tempered
C hard drawn
D None of the Above

Answer: annealed
30 The insulating material should have
A low permittivity
B high resistivity
C high dielectric strength
D all of the above

Answer: all of the above
31 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: all of the above
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: it is hygroscopic
33 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: all of the above
34 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: 50 cm
35 Underground cables are laid at sufficient depth
A to minimise temperature stresses
B to avoid being unearthed easily due to removal of soil
C to minimise the effect of shocks and vibrations due to gassing vehicles, etc
D for all of the above reasons

Answer: to minimise the effect of shocks and vibrations due to gassing vehicles, etc
36 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: 0.04 mm
37 In a cable the voltage stress is maximum at
A sheath
B insulator
C surface of the conductor
D core of the conductor

Answer: core of the conductor
38 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: prevent the moisture from entering the cable
39 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: one half
40 Cables, generally used beyond 66 kV are
A oil filled
B S.L. type
C belted
D armoured

Answer: oil filled

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