Sewer manholes are generally provided at

Drop manholes are the manholes

A

Without entry ladders

B

Without manhole covers

C

With depths more than 3.5 m

D

Having drains at different levels

Drop manholes at the junctions of sewer lines, are provided if

A

Invert level of a branch sewer is more than 60 cm that of the main sewer

B

Sewer line runs along a main road

C

Ordinary manhole cannot be built

D

Two sewer lines intersect

The major axis of elliptical manholes on the shell should be provided

A

Longitudinally

B

Circumferentially

C

On dished end

D

Anywhere

Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.

A

Nozzle or rim

B

Flared out

C

Fluid in

D

Ring plate

The function of manholes provided in the shell of a distillation column is to

A

Keep a check on the liquid gradient over the plate by direct visual observation

B

Give access to the individual trays for cleaning, maintenance and installation

C

Guard against foaming & entrainment by dumping antifoaming agent through it

D

All of the above

If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

A

Hydrogen sulphide

B

Carbon dioxide

C

Methane

D

Oxygen

For large sewers, maximum distance between manholes may be

A

50 m

B

100 m

C

200 m

D

300 m

Sewer ventilating columns are generally placed at

A

Distances 150 m to 300 m

B

Upper ends of branch sewers

C

Every change in the size of sewers

D

All the above

The trap which is provided to disconnect the house drain from the street sewer is called

A

Master trap

B

Intercepting trap

C

Interception manhole

D

All the above

Ventilating shafts are provided to a sewer line at every

A

100 m

B

150 m

C

200 m

D

300 m

Sewer manholes are generally provided at

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