## Q. 11 **If ***D *is the depth of scour below original bed, then the width of launching apron is generally taken as

*D*is the depth of scour below original bed, then the width of launching apron is generally taken as

A. 2.0 *D*

B. 1.2 *D*

C. 1.5 *D*

D. 2.5 *D*

C. 1.5 D

## Q. 12**For efficient working of a control meter, its throat length is approximately kept**

A. Three times the critical depth

B. Four times the critical depth

C. Twice the critical depth

D. Equal to the critical depth

A. Three times the critical depth

## Q. 13 **The net head under which the turbine reaches its peak efficiency at synchronous speed is called**

A. Gross head

B. Design head

C. Operating head

D. Rated head

B. Design head

## Q. 14 **Pick up the correct statement from the following:**

A. The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm

B. The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration

C. To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor

D. All the above

D. All the above

## Q. 15 **A unit hydro graph has one unit of**

A. Discharge

B. Rainfall duration

C. Rainfall excess

D. Time base of direct runoff

C. Rainfall excess

## Q. 16 **When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the permeability of the soil, is**

A. 0.001 cm/sec

B. 0.002 cm/sec

C. 0.0005 cm/sec

D. 0.01 cm/sec

A. 0.001 cm/sec

## Q. 17 **The maximum permissible eccentricity for no tension at the base of a gravity dam is**

A. *B*/6

B. *B*/2

C. *B*/3

D. *B*/4

A. B/6

## Q. 18 Levees and flood walls,

A. Are means of controlling floods

B. Are designed to carry unbalanced water load

C. Are designed with adequate dimensions

D. Are never provided free-boards

D. Are never provided free-boards

## Q. 19 **The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is**

A. Greater than 1

B. Less than 1

C. Equal to 1

D. Equal to zero

A. Greater than 1

## Q. 20 **Unit Hydrograph theory was enunciated by**

A. W.W. Horner

B. Merril Bernard

C. Le-Roy K. Shermen

D. Robert E. Horten

C. Le-Roy K. Shermen