##### Q1. Hydraulic gradient line (H.G.L.) represents the sum of

Ans: (d) pressure head and datum head.

##### Q3. The pressure rise (pi) due to water hammer, when valve is closed gradually is equal to

(a) ρLV
(b) ρLV/t
(c) ρt/VL
(d)ρ/LVt
where t = Time required to close the valve.

Ans:  (b) ρLV/t

##### Q4. The valve closure is said to be sudden if the time required to close the valve

(a) t = 2L/C
(b) t <2L/C
(c) t >2L/C
(d) none of the above
where C = Velocity of pressure wave produced, and L = Length of pipe.

Ans: (b) t <2L/C

##### Q5. Euler’s number is the ratio of

(a) inertia force to pressure force
(b) inertia force to elastic force
(c) inertia force to gravity force
(d) none of the above.

Ans:  (a) inertia force to pressure force

##### Q6. Models are known undistorted model, if

(a) the prototype and model are having different scale ratios
(b) the prototype and model are having same scale ratio
(c) model and prototype are kinematically similar
(d) none of the above.

Ans: (b) the prototype and model are having same scale ratio

##### Q7. Geometric similarity between model and prototype means

(a) the similarity of discharge
(b) the similarity of linear dimensions
(c) the similarity of motion
(d) the similarity of forces.

Ans: (b) the similarity of linear dimensions

##### Q8. Reynold number is expressed as

(a) Re =ρμL/V
(b) Re =VμL/ρ
(c) Re = ρVL/μ
(d) Re=V × L/ν

Ans: (c) Re = ρVL/μ

##### Q9. Mach number (M) is given by

(a) M = C/V
(b) M = V × C
(c) M = V/C
(d) none of the above.

Ans: (c) M = V/C

##### Q10. The ratio of inertia force to viscous force is known as

(a) Reynold number
(b) Froude number
(c) Mach number
(d) Euler number.

Ans: (a) Reynold number

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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