The material commonly used for sheaths of underground cables is

In the cables, sheaths are used to

A

Prevent the moisture from entering the cable

B

Provide enough strength

C

Provide proper insulation

D

None of the above

Which of the following methods is used for laying of underground cables?

A

Direct laying

B

Draw-in-system

C

Solid system

D

All of the above

Underground cables are laid at sufficient depth

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 gassing vehicles, etc.

D

For all of the above reasons

In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.

A

Yes

B

No

The electrostatic stress in underground cables is

A

Same at the conductor and the sheath

B

Minimum at the conductor and maximum at the sheath

C

Maximum at the conductor and minimum at the sheath

D

Zero at the conductor as well as on the sheath

The material commonly used for insulation in high voltage cables is

A

Lead

B

Paper

C

Rubber

D

None of the above

Rubber is most commonly used insulation in cables.

A

Yes

B

No

For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

A

Darcy’s formula

B

Slichter’s formula

C

Hazen’s formula

D

Lacy’s formula

Most commonly used joint in the underground pipe lines is the

A

Sleevejoint

B

Coupling

C

Flange

D

Expansion joint

The material generally used for armour of high voltage cables is

A

Aluminium

B

Steel

C

Brass

D

Copper

The material commonly used for sheaths of underground cables is

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