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

According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is

A

1.25 D

B

1.50 D

C

1.75 D

D

2.00 D

The scour depth D of a river during flood, may be calculated from the Lacey's equation

A

D = 0.47 $$\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)$$

B

D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{1}{2}}}$$

C

D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{1}{3}}}$$

D

D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{2}{3}}}$$

A swimming pool is initially filled to a depth of 96 inches. After 2 weeks, the depth has decreased to9212 inches. Assuming that the depth decreased at a constant rate, after how many days would the water depth have reached 9334 inches?

A

3

B

9

C

7

D

6

The rectangular beam 'A' has length ‘l’, width ‘b’ and depth ‘d’. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be _________ as compared to beam ‘A’.

A

Same

B

Double

C

Four times

D

Six times

The rectangular beam 'A ' has length l, width b and depth d. Another beam 'B' has the same width and depth but length is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.

A

Same

B

One-half

C

One-fourth

D

One-eighth

The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be __________ as compared to beam A.

A

Same

B

Double

C

Four times

D

Six times

If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then

A

d = 0.445 a

B

d = 0.557 a

C

d = 0.775 a

D

None of these

A circular flower bed has diameter 4m. The flower bed is increased so that the diameter is now 12m. How many times larger is the new flower bed?

A

9

B

3

C

32

D

8

If B and d are the bed width and depth of a channel in meters, the combined losses due to evaporation and seepage in cumecs per kilometer length of the channel, is

A

$$\frac{1}{{50}} \times {\left( {{\text{B}} + {\text{d}}} \right)^{\frac{2}{3}}}$$

B

$$\frac{1}{{100}} \times {\left( {{\text{B}} + {\text{d}}} \right)^{\frac{2}{3}}}$$

C

$$\frac{1}{{150}} \times {\left( {{\text{B}} + {\text{d}}} \right)^{\frac{2}{3}}}$$

D

$$\frac{1}{{200}} \times {\left( {{\text{B}} + {\text{d}}} \right)^{\frac{2}{3}}}$$

If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

A

$${\text{B}} = 0.22\sqrt {{\text{H}} + {\text{d}}} $$

B

$${\text{B}} = 0.33\sqrt {{\text{H}} + {\text{d}}} $$

C

$${\text{B}} = 0.44\sqrt {{\text{H}} + {\text{d}}} $$

D

$${\text{B}} = 0.55\sqrt {{\text{H}} + {\text{d}}} $$

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

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