Hydraulics And Fluid Mechanics MCQ Questions & Answers

51

The error in discharge $$\left( {\frac{{{\text{dQ}}}}{{\text{Q}}}} \right)$$ to the error in measurement of head $$\left( {\frac{{{\text{dH}}}}{{\text{H}}}} \right)$$ over a triangular notch is given by

A) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{3}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$ B) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = 2 \times \frac{{{\text{dH}}}}{{\text{H}}}$$ C) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{5}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$ D) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = 3 \times \frac{{{\text{dH}}}}{{\text{H}}}$$

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Answer & Solution

Answer: Option C

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52

The error in discharge $$\left( {\frac{{{\text{dQ}}}}{{\text{Q}}}} \right)$$ to the error in measurement of head $$\left( {\frac{{{\text{dH}}}}{{\text{H}}}} \right)$$ over a rectangular notch is given by

A) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{1}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$ B) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{3}{4} \times \frac{{{\text{dH}}}}{{\text{H}}}$$ C) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{{{\text{dH}}}}{{\text{H}}}$$ D) $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{3}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$

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Answer & Solution

Answer: Option D

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53

According to Bernoulli's equation

A) $${\text{Z}} + \frac{{\text{p}}}{{\text{w}}} + \frac{{{{\text{v}}^2}}}{{2{\text{g}}}} = {\text{constant}}$$ B) $${\text{Z}} + \frac{{\text{p}}}{{\text{w}}} - \frac{{{{\text{v}}^2}}}{{2{\text{g}}}} = {\text{constant}}$$ C) $${\text{Z}} - \frac{{\text{p}}}{{\text{w}}} + \frac{{{{\text{v}}^2}}}{{2{\text{g}}}} = {\text{constant}}$$ D) $${\text{Z}} - \frac{{\text{p}}}{{\text{w}}} - \frac{{{{\text{v}}^2}}}{{2{\text{g}}}} = {\text{constant}}$$

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Answer & Solution

Answer: Option A

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54

Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?

A) Venturimeter B) Orifice plate C) Nozzle D) All of the above

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Answer & Solution

Answer: Option D

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55

Ratio of inertia force to surface Jension is known as

A) Mach number B) Froude number C) Reynolds’s number D) Weber’s number

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Answer & Solution

Answer: Option D

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56

The ratio of absolute viscosity to mass density is known as

A) Specific viscosity B) Viscosity index C) Kinematic viscosity D) Coefficient of viscosity

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Answer & Solution

Answer: Option C

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57

The velocity at which the flow changes from laminar flow to turbulent flow is called

A) Critical velocity B) Velocity of approach C) Sub-sonic velocity D) Super-sonic velocity

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Answer & Solution

Answer: Option A

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58

Coefficient of discharge C_d is equal to (where C_c = Coefficient of contraction, C_v = Coefficient of velocity and C_r = Coefficient of resistance)

A) $${{\text{C}}_{\text{c}}} \times {{\text{C}}_{\text{v}}}$$ B) $${{\text{C}}_{\text{c}}} \times {{\text{C}}_{\text{r}}}$$ C) $${{\text{C}}_{\text{v}}} \times {{\text{C}}_{\text{r}}}$$ D) $$\frac{{{{\text{C}}_{\text{c}}}}}{{{{\text{C}}_{\text{r}}}}}$$

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Answer & Solution

Answer: Option A

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59

An average value of coefficient of velocity is

A) 0.62 B) 0.76 C) 0.84 D) 0.97

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Answer & Solution

Answer: Option D

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60

A flow through an expanding tube at constant rate is called

A) Steady uniform flow B) Steady non-uniform flow C) Unsteady uniform flow D) Unsteady non-uniform flow

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Answer & Solution

Answer: Option B

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

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering