Underground Cables Quiz | Underground Cables Objective Type Questions and Answers

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Questions
21 Why are the inter sheaths in cables used?
A Provides proper stress distribution.
B Minimises the stress.
C Provides protection against moisture, current and voltage surges.
D To improve the insulation.

Answer: Provides proper stress distribution.
22 Armouring is provided above the bedding. The armouring consists of one or two layers of which wire or tape?
A Thin wires of copper.
B Wire made of both copper and cadmium.
C Galvanised steel wire.
D Wires of aluminium.

Answer: Galvanised steel wire.
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23 What is the purpose of bedding on the underground cables?
A To avoid leakage of current.
B To protect the sheath against corrosion.
C To protect the sheath from mechanical injury due to armouring.
D Both (b) and (c)

Answer: Both (b) and (c)
24 The breakdown voltage of a cable depends on
A time of application of the voltage
B working temperature
C presence of moisture
D all of the above

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

Answer: it is hygroscopic
26 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
27 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
28 Copper as conductor for cables is used as
A hard drawn
B annealed
C hardened and tempered
D alloy with chromium

Answer: annealed
29 If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
A 50 cm
B 10 cm
C 2 cm
D 400 cm

Answer: 50 cm
30 Cables for 220 kV lines are invariably
A compressed oil or compressed gas insulated
B paper insulated
C mica insulated
D none of the above

Answer: compressed oil or compressed gas insulated
31 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
32 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
33 A cable carrying alternating current has
A hysteresis and leakage losses only
B hysteresis, leakage, copper and friction losses
C hysteresis losses only
D hysteresis, leakage and copper losses only

Answer: hysteresis and leakage losses only
34 The insulation of the cable decreases with
A the decrease in the length of the insulation
B the increase in length of the insulation
C either (a) or (b)
D none of the above

Answer: the increase in length of the insulation
35 The breakdown of insulation of the cable can be avoided economically by the use of
A inter-sheaths
B insulating materials with different dielectric constantswork
C both (a) and (b)
D none of the above

Answer: both (a) and (b)
36 The electrostatic stress in underground cables is
A maximum at the conductor and minimum at the sheath
B minimum at the conductor and maximum at the sheath
C same at the conductor and the sheath
D none of the above

Answer: maximum at the conductor and minimum at the sheath
37 The intersheaths in the cables are used to
A provide proper stress distributionformula
B avoid the requirement of good insulation
C minimize the stress
D none of the above

Answer: provide proper stress distribution
38 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

Answer: one half
39 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
40 Cables, generally used beyond 66 kV are
A oil filled
B armoured
C S.L. type
D belted

Answer: oil filled

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