MCQ . electrical Cable

24. Which of the following protects a cable against mechanical injury ?
(a) Bedding
(b) Sheath
(c) Armouring✔
(d) None of the above


23.  Which of the following insulation is used in cables ?
(a) Varnished cambric
(b) Rubber
(c) Paper
(d) Any of the above✔


 22. Empire tape is
(a) varnished cambric✔
(b) vulcanised rubber
(c) impregnated paper
(d) none of the above


21. The thickness of the layer of insulation on the conductor, in cables, depends upon
(a) reactive power
(b) power factor
(c) voltage✔
(d) current carrying capacity

20. The bedding on a cable consists of
(a) hessian cloth
(b) jute
(c) any of the above✔
(d) none of the above


19. The insulating material for cables should
(a) be acid proof
(b) be non-inflammable
(c) be non-hygroscopic
(d) have all above properties✔


18. In a cable immediately above metallic sheath _____ is provided.
(a) earthing connection
(b) bedding✔
(c) armouring
(d) none of the above


17. The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
(a) absence of harmonics
(b) non-existence of any stability limit
(c) smaller dielectric loss
(d) absence of ripples✔
(e) none of the above


16. In case of three core flexible cable the colour of the neutral is
(a) blue✔
(b) black
(c) brown
(d) none of the above


15. cables are used for 132 kV lines.
(a) High tension
(b) Super tension
(c) Extra high tension
(d) Extra super voltage✔

14. Conduit pipes are normally used to protect _____ cables.
(a) unsheathed cables✔
(b) armoured
(c) PVC sheathed cables
(d) all of the above

13. The minimum dielectric stress in a cable is at
(a) armour
(b) bedding
(c) conductor surface
(d) lead sheath✔


12. In single core cables armouring is not done to
(a) avoid excessive sheath losses✔
(b) make it flexible
(c) either of the above
(d) none of the above

11. Dielectric strength of rubber is around
(a) 5 kV/mm
(b) 15 kV/mm
(c) 30 kV/mm✔
(d) 200 kV/mm

10. Low tension cables are generally used up to
(a) 200 V
(b) 500 V
(c) 700 V
(d) 1000 V✔


9. In a cable, the maximum stress under operating conditions is at
(a) insulation layer
(b) sheath
(c) armour
(d) conductor surface✔


8.High tension cables are generally used up to
(a) 11kV✔
(b) 33kV
(c) 66 kV
(d) 132 kV

 7.The surge resistance of cable is
(a) 5 ohms
(b) 20 ohms
(c) 50 ohms✔
(d) 100 ohms

6.PVC stands for
(a) polyvinyl chloride✔
(b) post varnish conductor
(c) pressed and varnished cloth
(d) positive voltage conductor
(e) none of the above


5.In 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

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


 3.Pressure cables are generally not used beyond
(a) 11 kV
(b) 33 kV
(c) 66 kV✔
(d) 132 kV

2.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

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