15.  The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
A.1.5
B.2
C.3
D. 4.0.

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16.  Pick up the correct statement from the following :
A. Maximum daily flow = 2 times the average daily flow
B. Maximum daily flow = x average daily flow 3
C. Sewers are designed for minimum permissible velocity at minimum flow
D. All the above.

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17. Pick up the correct statement from the following :
A. The maximum rate of storm run off is called peak drainage discharge
B. Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares
C. The period after which the entire area starts contributing to the run off, is called the time of concentration
D. All the above.

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18.  For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
A. Kinchling
B. Lloyd Davis
C. Frubling
D. all the above.

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19.  The rainfall at any place may be determined by
A. its intensity
B. its direction
C. its frequency
D. all the above.

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20.  The intensity of rain is expressed in
A. cm/minute
B. cm/hour
C. cm/day
D. none of these.

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21. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours.

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