Electrical Engineering MCQs

Page No. 212

If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?


a5 kV/mm

✖


b10 kV/mm

✓


c15 kV/mm

✖


d30 kV/mm

✖


View Answer 10 kV/mm

In cables the charging current__________?


a lags the voltage by 90°

✖


b leads the voltage by 90°

✓


clags the voltage by 180°

✖


d leads the voltage by 180°

✖



Solid type cables are considered unreliable beyond 66 kV because___________?


a insulation may melt due to higher temperature

✖


bskin effect dominates on the conductor

✖


cof corona loss between conductor and sheath material

✖


dthere is a danger of breakdown of insulation due to the presence of voids

✓



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_____________?


aone half

✓


bdouble

✖


cfour times

✖


dnone of the above

✖


View Answer one half

Pressure cables are generally not used beyond__________?


a11 kV

✖


b 33 kV

✖


c 66 kV

✓


d132 kV

✖


View Answer 66 kV

The relative permittivity of rubber is____________?


abetween 2 and 3

✓


b between 5 and 6

✖


c between 8 and 10

✖


d between 12 and 14

✖


View Answer between 2 and 3

The material for armouring on cable is usually__________?


asteel tape

✖


b galvanised steel wire

✖


c any of the above

✓


dnone of the above

✖


View Answer any of the above

Conduit pipes are normally used to protect _______ cables


a unsheathed cables

✓


b armoured

✖


c PVC sheathed cables

✖


dall of the above

✖


View Answer unsheathed cables

PVC stands for____________?


apolyvinyl chloride

✓


b post varnish conductor

✖


cpressed and varnished cloth

✖


dpositive voltage conductor

✖


View Answer polyvinyl chloride

In capacitance grading of cables we use a _______ dielectric?


acomposite

✖


b porous

✖


chomogeneous

✖


d hygroscopic

✓


View Answer hygroscopic

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