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-10 section-6

The discharge through a reaction turbine __________ with the increase in unit speed.

A) Decreases B) Increases C) Remain same D) None of these

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Answer & Solution

Answer: Option A

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Poise is the unit of

A) Surface tension B) Capillarity C) Viscosity D) Shear stress in fluids

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Answer & Solution

Answer: Option C

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The hydraulic efficiency of an impulse turbine is the

A) Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine B) Ratio of the actual work available at the turbine to the energy imparted to the wheel C) Ratio of the work done on the wheel to the energy of the jet D) None of the above

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Answer & Solution

Answer: Option C

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In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate and $$\alpha $$ = Inclination of the gate with the normal to the side of the lock)

A) $$\frac{{\text{P}}}{{\sin \alpha }}$$ B) $$\frac{{2{\text{P}}}}{{\sin \alpha }}$$ C) $$\frac{{\text{P}}}{{2\sin \alpha }}$$ D) $$\frac{{2{\text{P}}}}{{\sin \frac{\alpha }{2}}}$$

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Answer & Solution

Answer: Option C

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A fluid which obeys the Newton's law of viscosity is termed as

A) Real fluid B) Ideal fluid C) Newtonian fluid D) Non-Newtonian fluid

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Answer & Solution

Answer: Option C

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The rise or depression of liquid in a tube due to surface tension will increase in size of tube will

A) Increase B) Remain unaffected C) May increase or decrease depending on the characteristics of liquid D) Decrease

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Answer & Solution

Answer: Option D

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Casting of a centrifugal pump is designed so as to minimize

A) Friction loss B) Cavitations C) Static head D) Loss of kinetic energy

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Answer & Solution

Answer: Option D

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Viscosity of water in comparison to mercury is

A) Higher B) Lower C) Same D) Higher/lower depending on temperature

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Answer & Solution

Answer: Option B

Solution:

Viscosity of water in comparison to mercury is Lower.
Viscosity: It describes the internal friction of a moving fluid. A fluid with large viscosity resists motion because its molecular makeup gives it a lot of internal friction.
Mercury dynamic viscosity at temperature 300K is 1.53
Water dynamic viscosity at temperature 300K is 0.89

A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is

A) 175.4 r.p.m. B) 215.5 r.p.m. C) 241.5 r.p.m. D) 275.4 r.p.m

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Answer & Solution

Answer: Option C

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100

Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.

A) Plus B) Minus C) Divide D) Multiply

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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