Fluid Mechanics MCQ Questions & Answers

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Each section contains 100 MCQs on Fluid Mechanics .

Froude number is the ratio of

A) Shear stress to gravitational stress B) Drag stress to shear stress C) Inertial stress to shear stress D) Inertial stress to gravitational stress

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.

A) Incompressible B) Non-viscous C) Both A and B D) Neither A nor B

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Disc compensators are provided in large diameter fuel gas carrying pipelines to

A) Keep the pipe in proper orientation B) Make the pipe joint leak-proof C) Account for contraction/expansion of pipe due to temperature changes of the surroundings D) Account for the pressure variation side the pipeline

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

During ageing of fluid carrying pipes, the

A) Pipe becomes smoother with use B) Friction factor increases linearly with time C) Absolute roughness decreases with time D) Absolute roughness increases linearly with time

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

A gas (density = 1.5 kg/m³, viscosity = 2 × 10^-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m³ and viscosity of 3 × 10^-5 kg/m.s flowing at 3 m/s will be

A) 8400 Pa/m B) 12600 Pa/m C) 18900 Pa/m D) 16800 Pa/m

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Centrifugal pump can't be used to pump

A) Molten sodium (used as a coolant in Fast Breeder Reactor) B) Moderately viscous vegetable oil used in soap industry C) Thick molten soap at 80°C D) None of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

A) Q ∝ N : H ∝ N² : P ∝ N³ B) Q ∝ N² : H ∝ N³ : P ∝ N C) Q ∝ N : H ∝ N³ : P ∝ N² D) Q ∝ N³ : H ∝ N : P ∝ N²

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The percentage slip in a reciprocating pump set is given by the % of (where, Q₁ = actual discharge Q₂ = theoretical discharge)

A) $$\frac{{{{\text{Q}}_1}}}{{{{\text{Q}}_2}}}$$ B) $$\frac{{{{\text{Q}}_2}}}{{{{\text{Q}}_1}}}$$ C) $$\frac{{{{\text{Q}}_2} - {{\text{Q}}_1}}}{{{{\text{Q}}_1}}}$$ D) $$\frac{{{{\text{Q}}_2} - {{\text{Q}}_1}}}{{{{\text{Q}}_2}}}$$

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'V_avg'?

A) D Δp/8L B) D Δp/4L C) 8 . V_avg/D D) 4 . V_avg/D

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Gear pump

A) Is a positive displacement pump B) Is a centrifugal pump C) Is a non-positive displacement pump D) Can be started with delivery valve closed

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering