1. The insulating material for a cable should have [ d ]
a. low cost
b. high dielectric strength
c. high mechanical strength
d. all of the above
Answer - d. all of the above
a. bedding
b. sheath
c. armouring
d. none of he above
Answer - c. armouring
a. Varnished cambric
b. rubber
c. paper
d. any of the above
Answer - d. any of the above
a. varnished cambric
b. vulcanized rubber
c. impregnated paper
d. none of the above
Answer - a. varnished cambric
5. The thickness of the layer on insulation on the conductor, in cables, depends upon [ c ]
a. bedding
b. sheath
c. armouring
d. none of he above
Answer - c. armouring
6. The bedding on a cable consists of [ c ]
a. Hessian cloth
b. jute
c. any of the above
d. none of the above
Answer - c. any of the above
7. The insulating material for cables should [ d ]
a. be acid proof
b. be non-inflammable
c. be non-hygroscopic
d. have all above properties
Answer - d. have all above properties
8. In a cable immediately above metallic sheath……….. is provided [ b ]
a. earthing connection
b. bedding
c. armouring
d. none of the above
Answer - b. bedding
9. In case of three core flexible cable the colour of the neutral is [ a ]
a. blue
b. black
c. brown
d. none of the above
Answer - a. blue
10. Low tension cables are generally used upto [ d ]
a. 200 V
b. 500 V
c. 700 V
d. 1000 V
Answer - d. 1000 V
11. PVC stands for [ a ]
a. polyvinyl chloride
b. post varnish conductor
c. pressed and varnished cloth
d. positive voltage conductor
e. all above parameters
Answer - a. polyvinyl chloride
12 In the cables, the location of fault is usually found out by comparing [ d ]
a. the resistance of the conductor
b. the inductance of conductors
c. the capacitances of insulated conductors
d. all above parameters
Answer - d. all above parameters
13. The material for armouring on cable is usually [ c ]
a. steel tape
b. galvanized steel wire
c. any of the above
d. none of the above
Answer - c. any of the above
a. prevent the moisture from entering the cable
b. provide enough strength
c. provide proper insulation
d. none of the above
Answer - a. prevent the moisture from entering the cable
15. Underground cables are laid at sufficient depth [ c ]
a. to minimize temperature stresses
b. to avoid being unearthed easily due to removal of soil
c. to minimize the effect of shocks and vibrations due to passing vehicles, etc
d. for all of the above reasons
Answer - c. to minimize the effect of shocks and vibrations due to passing vehicles, etc
16. The advantage of cable over overhead transmission lines is [ c ]
a. easy maintenance
b. low cost
c. can be used in congested areas
d. can be used in high voltage circuits
Answer - c. can be used in congested areas
17. The insulating material should have [ d ]
a. low permittivity
b. high resistivity
c. high dielectric strength
d. all of the above
Answer - d. all of the above
18. The disadvantage with paper as insulating material is [ a ]
a. it is hygroscopic
b. it has high capacitance
c. it is an organic material
d. none of the above
Answer - a. it is hygroscopic
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