Fluid Mechanics MCQ Questions & Answers

11

The discharge through a semi-circular weir varies as (where, H = Head of liquid.)

A) H B) H² C) $${{\text{H}}^{\frac{3}{2}}}$$ D) $${{\text{H}}^{\frac{1}{2}}}$$

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Answer & Solution

Answer: Option B

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12

Fluid flow in a/an __________ is an example of pressure flow.

A) Partially filled pipeline B) Pipe C) Open channel D) River

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Answer & Solution

Answer: Option B

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13

In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow?

A) Discharge of water by a centrifugal pump being run at a constant rpm B) Water flow in the suction and discharge pipe of a reciprocating pump C) Water discharge from a vertical vessel in which constant level is maintained D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

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Answer & Solution

Answer: Option B

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14

__________ pumps are a group of vacuum pumps.

A) Hyter B) Sump C) Mono D) Submerged

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Answer & Solution

Answer: Option A

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15

A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?

A) Inertial and drag forces are important B) Drag, gravitational and buoyancy forces are impportant C) Drag force and gravitational forces are important D) None of the above

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Answer & Solution

Answer: Option B

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16

The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its

A) Absolute viscosity B) Ratio of absolute viscosity to density C) Density D) Reynolds number

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Answer & Solution

Answer: Option B

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17

Bernoulli's equation is dependent on the

A) First law of thermodynamics B) Third law of thermodynamics C) Law of conservation of momentum D) None of these

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Answer & Solution

Answer: Option D

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18

The speed of a sound wave in a gas is analogous to the speed of

A) An elementary wave in an open channel B) Flow in an open channel C) A disturbance travelling upstream in moving fluid D) None of these

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Answer & Solution

Answer: Option A

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19

Newton's law of viscosity relates the

A) Shear stress and velocity B) Velocity gradient and pressure intensity C) Shear stress and rate of angular deformation in a fluid D) Pressure gradient and rate of angular deformation

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Answer & Solution

Answer: Option C

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20

Priming is needed in a __________ pump.

A) Reciprocating B) Gear C) Centrifugal D) Diaphragm

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Answer & Solution

Answer: Option C

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering