##### Q31. The discharge through a rectangular channel is maximum when

(a) m = d/3
(b) m =d/2
(c) m = 2d
(d) m =3d/2
where m = Hydraulic mean depth, d = Depth of flow.

Ans:  (b) m =d/2

##### Q32. If the Froude number in open channel flow is equal to 1.0, the flow is called

(a) critical flow
(b) streaming flow
(c) shooting flow
(d) none of the above.

Ans:  (a) critical flow

##### Q33. If the Froude number in open channel flow is more than 1.0, the flow is called

(a) critical flow
(b) streaming flow
(c) shooting flow
(d) none of the above.

Ans:  (c) shooting flow

##### Q34. The flow in open channel is laminar if the Reynold number is

(a) 2000
(b) less than 2000
(c) less than 500
(d) none of the above.

Ans:  (c) less than 500

##### Q35. The flow in open channel is turbulent if the Reynold number is

(a) 2000
(b) more than 2000
(c) more than 4000
(d) 4000.

Ans:  (b) more than 2000

##### Q36. If the Froude number in open channel flow is less than 1.0, the flow is called

(a) critical flow
(b) super-critical
(c) sub-critical
(d) none of the above.

Ans:  (c) sub-critical

##### Q37. Super-sonic flow means

(a) Mach number = 1.0
(b) Mach number = 1.0
(c) Mach number > 1.0
(d) None of the above.

Ans:  (c) Mach number > 1.0

##### Q38. Sonic-flow means

(a) Mach number < 1.0
(b) Mach number = 1.0
(c) Mach number > 1.0
(d) None of the above.

Ans:  (b) Mach number = 1.0

##### Q39. In sonic-flow, the disturbances, created by a projectile, moves

(a) along the projectile
(b) ahead of the projectile
(c) behind the projectile
(d) none of the above.

Ans:  (a) along the projectile

##### Q40. In super-sonic flow, the projectile (which creates disturbances) moves

(a) ahead of the disturbances
(b) along the disturbances
(c) behind the disturbances
(d) none of the above.

Ans:  (a) ahead of the disturbances

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Hydraulics and Fluid mechanics MCQ-Section-1

Hydraulics and Fluid mechanics MCQ-Section-2

Hydraulics and Fluid mechanics MCQ-Section-3

Hydraulics and Fluid mechanics MCQ-Section-4

Hydraulics and Fluid mechanics MCQ-Section-5