Hydraulics And Fluid Mechanics MCQ Questions & Answers

71

A double overhung Pelton wheel has

A) Two jets B) Two runners C) Four jets D) Four runners

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

72

A compound pipe of diameter d₁, d₂ and d₃ having lengths $${l_1},\,{l_2}$$ and $${l_3}$$ is to be replaced by an equivalent pipe of uniform diameter d and of the same length $$l$$ as that of the compound pipe. The size of the equivalent pipe is given by

A) $$\frac{l}{{{{\text{d}}^2}}} = \frac{{{l_1}}}{{{\text{d}}_1^2}} + \frac{{{l_2}}}{{{\text{d}}_2^2}} + \frac{{{l_3}}}{{{\text{d}}_3^2}}$$ B) $$\frac{l}{{{{\text{d}}^3}}} = \frac{{{l_1}}}{{{\text{d}}_1^3}} + \frac{{{l_2}}}{{{\text{d}}_2^3}} + \frac{{{l_3}}}{{{\text{d}}_3^3}}$$ C) $$\frac{l}{{{{\text{d}}^4}}} = \frac{{{l_1}}}{{{\text{d}}_1^4}} + \frac{{{l_2}}}{{{\text{d}}_2^4}} + \frac{{{l_3}}}{{{\text{d}}_3^4}}$$ D) $$\frac{l}{{{{\text{d}}^5}}} = \frac{{{l_1}}}{{{\text{d}}_1^5}} + \frac{{{l_2}}}{{{\text{d}}_2^5}} + \frac{{{l_3}}}{{{\text{d}}_3^5}}$$

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

73

The normal stress is same in all directions at a point in a fluid

A) Only when the fluid is frictionless B) Only when the fluid is incompressible and has zero viscosity C) When there is no motion of one fluid layer relative to an adjacent layer D) Irrespective of the motion of one fluid layer relative to an adjacent layer

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

74

Air vessels in reciprocating pump are used to

A) Smoothen flow B) Reduce acceleration to minimum C) Increase pump efficiency D) Save pump from cavitations

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

75

The optimum value of vane exit angle for a centrifugal pump impeller is

A) 10-15° B) 20-25° C) 30-40° D) 50-60°

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

76

The specific speed (N_s) of a centrifugal pump is given by

A) $$\frac{{{\text{N}}\sqrt {\text{Q}} }}{{{{\text{H}}^{\frac{2}{3}}}}}$$ B) $$\frac{{{\text{N}}\sqrt {\text{Q}} }}{{{{\text{H}}^{\frac{3}{4}}}}}$$ C) $$\frac{{{\text{N}}\sqrt {\text{Q}} }}{{\text{H}}}$$ D) $$\frac{{{\text{N}}\sqrt {\text{Q}} }}{{{{\text{H}}^{\frac{5}{4}}}}}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

77

In an outward flow reaction turbine

A) The water flows parallel to the axis of the wheel B) The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel C) The water enters the wheel at the outer periphery and then flows towards the centre of the wheel D) The flow of water is partly radial and partly axial

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

78

In an inward flow reaction turbine

A) The water flows parallel to the axis of the wheel B) The water enters at the center of the wheel and then flows towards the outer periphery of the wheel C) The water enters the wheel at the outer periphery and then flows towards the center of the wheel D) The flow of water is partly radial and partly axial

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

79

If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water, the horse power required will be

A) Same B) 0.75 B.H.P C) $$\frac{{{\text{B}}{\text{.H}}{\text{.P}}{\text{.}}}}{{0.75}}$$ D) 1.5 B.H.P

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

80

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

A) $$\frac{{2\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$ B) $$\frac{{2\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$ C) $$\frac{{\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$ D) $$\frac{{\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Hydraulics And Fluid Mechanics MCQ Questions &amp; Answers | Mechanical Engineering

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering