SECTION-2

(a) P = R × θ
(b) P = 2Rθ
(c) P = 4Rθ
(d) P = 3Rθ.

Ans: (b) P = 2Rθ

##### Q52. The area of flow of a trapezoidal channel is given by

(a) A = (b + 2nd) × d
(b) A = (b + nd) × d
(c) A = (2b + nd) × d
(d) A = (b + nd) × 2d
where b = Width, d = Depth, and n = Side slope of the channel.

Ans:  (b) A = (b + nd) × d

##### Q53. Which one of the following is a dimensionless constant?

(a) Chezy’s constant
(b) Manning’s constant
(c) Reynolds number
(d) none of the above.

Ans: (c) Reynolds number

##### Q54. The dimensions of the Chezy’s constant is given by

(a) L1/2 T1/2
(b) L1/2 T3/4
((c) L1/2 T–1
(d) LT1/2

Ans:  (c) L1/2 T1

##### Q55. Manning’s formula is used for finding …… in a channel.

(a) rate of flow
(b) velocity
(c) hydraulic mean depth
(d) slope.

Ans: (b) velocity

##### Q56. Chezy’s formula is used for finding …… in a channel.

(a) velocity
(b) discharge
(c) slope
(d) hydraulic mean depth.

Ans: (a) velocity

(a) G.V.F.
(b) R.V.F.
(c) P.V.F.
(d) M.V.F.

Ans:  (a) G.V.F.

(a) G.V.F.
(b) R.V.F.
(c) P.V.F.
(d) M.V.F.

Ans: (b) R.V.F.

##### Q59. For sub-critical flow in a channel

(a) Fe = 1
(b) Fe > 1
(c) Fe< 1
(d) none of the above.
where Fe = Froude number.

Ans: (c) Fe< 1

##### Q60. Hydraulic mean depth is given by

(a) m =P/A
(b)A/P
(c) m = A × P
(d) 1/AP

Ans:  (b)A/P

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Hydraulics and Fluid mechanics MCQ-Section-1

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Hydraulics and Fluid mechanics MCQ-Section-5