Cables Quiz practies questions test1

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Test your caliber

1. The insulating material for a cable should have _______.
low cost	high dielectric strength
high mechanical strength	all of the above

2. Which of the following protects a cable against mechanical injury ?
Bedding	Sheath
Armouring	None of the above

3. Which of the following insulation is used in cables ?
Varnished cambric	Rubber
Paper	Any of the above

4. Empire tape is ______.
varnished cambric	vulcanised rubber
impregnated paper	none of the above

5. The thickness of the layer of insulation on the conductor, in cables, depends upon ______.
reactive power	power factor
voltage	current carrying capacity

6. The bedding on a cable consists of ______.
hessian cloth	jute
any of the above	none of the above

7. The insulating material for cables should ______.
be acid proof	be non-inflammable
be non-hygroscopic	have all above properties

8. In a cable immediately above metallic sheath _____ is provided.
earthing connection	bedding
armouring	none of the above

9. The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to ______.
absence of harmonics	non-existence of any stability limit
smaller dielectric loss	absence of ripples

10. In case of three core flexible cable the colour of the neutral is ______.
blue	black
brown	none of the above

11. cables are used for 132 kV lines.
High tension	Super tension
Extra high tension	Extra super voltage

12. Conduit pipes are normally used to protect _____ cables.
unsheathed cables	armoured
PVC sheathed cables	all of the above

13. The minimum dielectric stress in a cable is at ______.
armour	bedding
conductor surface	lead sheath

14. In single core cables armouring is not done to _____.
avoid excessive sheath losses	make it flexible
either of the above	none of the above

15. Dielectric strength of rubber is around ______.
5 kV/mm	15 kV/mm
30 kV/mm	200 kV/mm

16. Low tension cables are generally used upto _____.
200 V	500 V
700 V	1000 V

17. In a cable, the maximum stress under operating conditions is at _____.
insulation layer	sheath
armour	conductor surface

18. High tension cables are generally used upto _____.
11kV	33kV
66 kV	132 kV

19. The surge resistance of cable is _____.
5 ohms	20 ohms
50 ohms	100 ohms

20. PVC stands for _____.
polyvinyl chloride	post varnish conductor
pressed and varnished cloth	positive voltage conductor