Hydraulics And Fluid Mechanics MCQ Questions & Answers

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

Learn Hydraulics And Fluid Mechanics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Hydraulics And Fluid Mechanics MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-4 section-6

Francis, Kaplan and propeller turbines fall under the category of

A) Impulse turbines B) Reaction turbines C) Axial flow turbines D) Mixed flow turbines

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Answer & Solution

Answer: Option B

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Which of the following pump is successfully used for lifting water to the boilers?

A) Centrifugal pump B) Reciprocating pump C) Jet pump D) Airlift pump

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Answer & Solution

Answer: Option C

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The value of mass density in kg-sec-V-m⁴ for water at 0°C is

A) 1 B) 1000 C) 100.9 D) 101.9

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Answer & Solution

Answer: Option D

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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 would discharge

A) Same quantity of liquid B) 0.75Q C) $$\frac{{\text{Q}}}{{0.75}}$$ D) 1.5Q

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Answer & Solution

Answer: Option A

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The torque required to overcome viscous resistance of a collar bearing is (where R₁ and R₂ = External and internal radius of collar)

A) $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{{\text{R}}_1} - {{\text{R}}_2}} \right)$$ B) $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^2 - {\text{R}}_2^2} \right)$$ C) $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^3 - {\text{R}}_2^3} \right)$$ D) $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^4 - {\text{R}}_2^4} \right)$$

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Answer & Solution

Answer: Option D

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In a reaction turbine, the draft tube is used

A) To run the turbine full B) To prevent air to enter the turbine C) To increase the head of water by an amount equal to the height of the runner outlet above the tail race D) To transport water to downstream

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Answer & Solution

Answer: Option C

Solution:

In a reaction turbine, the draft tube is used:

To increase the head of water by an amount equal to the height of the runner outlet above the tail race: The draft tube helps in converting the velocity head of the water exiting the turbine into pressure head, thus increasing the effective head and improving the efficiency of the turbine.

This function of the draft tube ensures that the water exiting the turbine maintains a higher pressure, which enhances the turbine's performance.

The draft tube does not run the turbine full, prevent air from entering, or transport water downstream.

In reaction turbine, draft tube is used

A) To transport water downstream without eddies B) To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section C) For safety of turbine D) To increase flow rate

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Answer & Solution

Answer: Option B

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The flow rate in gear pump

A) Increases with increase in pressure B) Decreases with increase in pressure C) More or less remains constant with increase in pressure D) Unpredictable

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Answer & Solution

Answer: Option C

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The increase of temperature results in

A) Increase in viscosity of gas B) Increase in viscosity of liquid C) Decrease in viscosity of gas D) Decrease in viscosity of liquid

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Answer & Solution

Answer: Option D

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Runaway speed of a hydraulic turbine is

A) Full load speed B) The speed at which turbine runner will be damaged C) The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open D) The speed corresponding to maximum overload permissible

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Answer & Solution

Answer: Option C

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

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering