SECTION-2

##### Q41. The velocity of flow, corresponding to critical depth is known as

(a) maximum velocity
(b) minimum velocity
(c) critical velocity
(d) average velocity.

Ans: (c) critical velocity

##### Q42. Hydraulic jump will take place if depth of flow is

(a) more than critical depth
(b) equal to critical depth
(c) less than critical depth
(d) two times the critical depth.

Ans:  (c) less than critical depth

##### Q43. A circular channel will have maximum velocity if depth of flow is equal to

(a) diameter of circular channel
(b) 0.81 times the diameter of circular channel
(c) 0.75 times the diameter of circular channel
(d) 0.625 times the diameter of circular channel.

Ans:  (b) 0.81 times the diameter of circular channel

##### Q44. The rate of flow through a circular channel will be maximum if depth of flow is equal to

(a) diameter of circular channel
(b) 0.95 times the dia. of circular channel
(c) 0.81 times the dia. of circular channel
(d) 0.75 times the dia. of circular channel.

Ans:  (b) 0.95 times the dia. of circular channel

##### Q45. The total energy of flowing water in a channel with respect to bed of channel is known as

(a) total energy
(b) specific energy
(d) mechanical energy.

Ans:  (b) specific energy

##### Q46. Critical depth is the depth of water at which

(a) specific energy is maximum
(b) specific energy is minimum
(c) specific energy is zero
(d) specific energy is one plus minimum specific energy.

Ans:  (b) specific energy is minimum

##### Q47. A section of a channel is most efficient if the discharge through the channel is maximum for a given

(a) area of flow
(b) surface resistance
(c) slope of the bed of channel
(d) all of the above.

Ans:  (d) all of the above.

##### Q48. A rectangular channel will be most efficient if depth of flow is equal to

(a) width of the channel
(b) twice the width of the channel
(c) half the width of channel
(d) one-quarter width of channel.

Ans:  (c) half the width of channel

##### Q49. For the most efficient rectangular channel, the hydraulic mean depth should be equal to

(a) depth of flow
(b) half of depth of flow
(c) twice the depth of flow
(d) one-quarter depth of flow.

Ans: (b) half of depth of flow

##### Q50 A trapezoidal channel will be most efficient if length of sloping side is equal to

(a) twice the top width
(b) top width
(c) half of the top width
(d) one-quarter of top width.

Ans:  (c) half of the top width

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