Sewer ventilating columns are generally placed at

Ventilating shafts are provided to a sewer line at every

A

100 m

B

150 m

C

200 m

D

300 m

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

Inter-distance between ventilation columns in a sewer line is kept

A

25 to 50 m

B

50 m to 100 m

C

100 m to 150 m

D

150 m to 300 m

Sewer manholes are generally provided at

A

The change of gradient

B

The change of direction

C

The junctions of sewers

D

All of these

If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

A

Hydrogen sulphide

B

Carbon dioxide

C

Methane

D

Oxygen

On sports day. if 30 children were made to stand in a column, 16 columns could be formed. If 24 children were made to stand in a column,how many columns could be formed?

A

45

B

20

C

22

D

29

On sports day, if 30 children were made to stand in a column, 16 columns could be formed. If 24 children were made a stand in a column, how many columns could be formed ?

A

40

B

20

C

22

D

30

Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.

A

Less

B

More

C

Same

D

Either A or B; no generalisation can be made

For walls, columns and vertical faces of all structural members, the form work is generally removed after

A

24 to 48 hours

B

3 days

C

7 days

D

14 days

If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

A

Square

B

Rectangular

C

Trapezoidal

D

Triangular

Sewer ventilating columns are generally placed at

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