Most recently Cables Multiple choice Questions and Answers pdf

31.    If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
(a)     5 kV/mm 
(b)     10 kV/mm
(a)     15 kV/mm 
(d)     30 kV/mm
Ans: b

32.    In the cables, sheaths are used to
(a)     prevent the moisture from entering the cable
(b)     provide enough strength
(e)    provide proper insulation
(d)    none of the above
Ans: a

33.    The intersheaths in the cables are used to
(a)     minimize the stress
(b)     avoid the requirement of good insulation
(c)    provide proper stress distribution
(d)    none of the above
Ans: c

34.    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
(e)    none of the above
Ans: c

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 constants
(c)    both (a) and (b)
(d)    none of the above
Ans: c

36.    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
Ans: a

37.    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
Ans: b

38.    In a cable the voltage stress is maximum at
(a)     sheath 
(6)     insulator
(e)    surface of the conductor
(d)     core of the conductor
Ans: d

39.    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)    capacitance required to be introduced at different lengths to counter the effect of inductance
(e)    none of the above
Ans: a

40.    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
Ans: c

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