92.  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.

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93. 'Cowl' is provided at
A. lower end of ventilating column
B. upper end of ventilating column
C. upper end of the manhole
D. first step in manhole:

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94.  The sewage is pumped up
A. from low lying areas
B. from flat areas
C. from basements
D. all the above.

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95.  The non-clog pump which permits solid matter to pass out with the liquid sewage, is
A. centrifugal pump
B. reciprocating pump
C. pneumatic ejector
D. none of these.

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96. The disintegrating pump in which solid matter is broken up before passing out, is
A. centrifugal pump
B. reciprocating pump
C. pneumatic ejector
D. none of these.

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97. The most widely used pump for lifting sewage is
A. centrifugal pump
B. reciprocating pump
C. pneumatic ejector
D. air pressure pump.

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98.  A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
A. 2.30 m
B. 2.40 m
C. 2.45 m
D. 2.50 m.

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