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-5 section-2

Pressure of the order of 10" torr can be measured by

A) Bourdon tube B) Pirani Gauge C) Micro-manometer D) Ionisation gauge

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Answer & Solution

Answer: Option D

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The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

A) $$\frac{1}{2}$$ × depth B) $$\frac{1}{2}$$ × breadth C) $$\frac{1}{2}$$ × sloping side D) $$\frac{1}{4}$$ × (depth + breadth)

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Answer & Solution

Answer: Option A

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The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.

A) Higher B) Lower C) Same D) None of these

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Answer & Solution

Answer: Option B

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A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

A) Increase B) Decrease C) Remain same D) Increase/decrease depending on depth of immersion

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Answer & Solution

Answer: Option C

Solution:

When an iron piece is suspended into the water without touching the sides of the bucket, the volume of water displaced by the iron piece is equal to the volume of the iron piece submerged. According to Archimedes' principle, the buoyant force acting on the iron piece (equal to the weight of the water displaced) is equal to the weight of the iron piece itself. Therefore, the net effect on the spring balance due to the addition of the iron piece is zero, and the reading of the spring balance will remain the same.

Fluid is a substance which offers no resistance to change of

A) Pressure B) Flow C) Shape D) Volume

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Answer & Solution

Answer: Option C

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According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

A) Directly as the air or gas density B) Inversely as square root of density C) Inversely as density D) As square of density

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Answer & Solution

Answer: Option C

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For centrifugal pump impeller, the maximum value of the vane exit angle is

A) 10° to 15° B) 15° to 20° C) 20° to 25° D) 25° to 30°

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Answer & Solution

Answer: Option C

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A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

A) $$\frac{{14\pi {{\text{R}}^{\frac{1}{2}}}}}{{15{{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} }}$$ B) $$\frac{{14\pi {{\text{R}}^{\frac{3}{2}}}}}{{15{{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} }}$$ C) $$\frac{{14\pi {{\text{R}}^{\frac{5}{2}}}}}{{15{{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} }}$$ D) $$\frac{{14\pi {{\text{R}}^{\frac{7}{2}}}}}{{15{{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} }}$$

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Answer & Solution

Answer: Option C

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Choose the wrong statement. Alcohol is used in manometer, because

A) Its vapour pressure is low B) It provides suitable meniscus for the inclined tube C) Its density is less D) It provides longer length for a given pressure difference

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Answer & Solution

Answer: Option A

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Alcohol is used in manometers because

A) It has low vapour pressure B) It is clearly visible C) It has low surface tension D) It can provide longer column due to low density

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Answer & Solution

Answer: Option D

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

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering