##### Q11. The square root of the ratio of inertia force to pressure force is known as

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

Ans: (d) Euler number.

##### Q12. Model analysis of pipes flow are based on

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

Ans: (a) Reynold number

##### Q13. The drag on a sphere (FD) for Reynolds number less than 0.2 is given by

(a) FD = 5πμDU
(b) FD = 3πμDU
(c) FD = 2πμDU
(d) FD= πμDU.

Ans:  (b) FD = 3πμDU

##### Q14. The skin friction drag on a sphere (for Reynolds number less than 0.2) is equal to

(a) one-third of the total drag
(b) half of the total drag
(c) two-third of the total drag
(d) none of the above.

Ans:(c) two-third of the total drag

##### Q15. The pressure drag on a sphere (for Reynolds number less than 0.2) is equal to

(a) one-third of the total drag
(b) half of the total drag
(c) two-third of the total drag
(d) none of the above.

Ans: (a) one-third of the total drag

##### Q16. Equation of state is expressed as

(a) pρ = RT
(b)p/ρ= RT
(c) ρ/p= RT
(d) p/ρ= R/T
where p = Absolute pressure, T = Absolute temperature, R = Gas constant, ρ = Density of gas.

Ans: (b)p/ρ= RT

##### Q17. The continuity equation in differential form is

(a) dA/A+dV/V+ dρ/ρ= 0
(b) AdA + VdV + ρdρ = 0
(c) A/dA+ V/dV+ ρ/dρ= Constant
(d) dA/A +dV/V +dρ/ρ= Constant.

Ans: (a) dA/A+dV/V+ dρ/ρ= 0

##### Q18. Mach angle (α) is given by

(a) sin α = V/C
(b) sin α = VC
(c) sin α = C/V
(d) sin α = 1/VC

Ans:  (c) sin α = C/V

##### Q19. A pump is defined as a device which converts

(a) hydraulic energy into mechanical energy
(b) mechanical energy into hydraulic energy
(c) kinetic energy into mechanical energy
(d) none of the above.

Ans:  (b) mechanical energy into hydraulic energy

##### Q20. A turbine is a device which converts

(a) hydraulic energy into mechanical energy
(b) mechanical energy into hydraulic energy
(c) kinetic energy into mechanical energy
(d) electrical energy into mechanical energy.

Ans:  (a) hydraulic energy into mechanical energy

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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