Latest Cables Multiple choice Questions and Answers pdf

21. the cables, the location of fault is usually found out by comparing
(a)    the resistance of the conductor
(b)    the inductance of conductors
(c)    the capacitances of insulated conductors
(d)    all above parameters
Ans: c

22.    In capacitance grading of cables we use a ______ dielectric.
(a)     composite 
(b)     porous
(c)     homogeneous  
(d)     hygroscopic
Ans: a

23.    Pressure cables are generally not used beyond
(a)     11 kV 
(b)     33 kV
(c)     66 kV 
(d)     132 kV
Ans: c

24.    The material for armouring on cable is usually
(a)     steel tape
(b)     galvanised steel wire
(c)    any of the above
(d)    none of the above
Ans: c

25.    Cables, generally used beyond 66 kV are
(a)     oil filled 
(b)     S.L. type
(c)     belted 
(d)     armoured
Ans: a

26.    The relative permittivity of rubber is
(a)    between 2 and 3
(b)    between 5 and 6
(c)    between 8 and 10
(d)    between 12 and 14
Ans: a

27.    Solid type cables are considered unreliable beyond 66 kV because
(a)     insulation may melt due to higher temperature
(b)     skin effect dominates on the conduc¬tor
(c)    of corona loss between conductor and sheath material
(d)    there is a danger of breakdown of insulation due to the presence of voids
Ans: d

28.    If the length of a cable is doubled, its capacitance
(a)    becomes one-fourth
(b)    becomes one-half
(c)    becomes double
(d)    remains unchanged
Ans: c

29.    In cables the charging current
(a)    lags the voltage by 90°
(b)    leads the voltage by 90°
(c)    lags the voltage by 180°
(d)     leads the voltage by 180°
Ans: b

30.    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 
(6)     double
(c)    four times 
(d)     none of the above
Ans: a

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