Fluid Mechanics MCQ Set 10

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FLUID MECHANICS MCQ SET 10

Q1. The device used to measure flow rate in an open channel is called:

A) Venturi meter
B) Orifice meter
C) Notch or Weir
D) Pitot tube

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Answer: C) Notch or Weir
Explanation: Notches and weirs are standard devices to measure discharge in open channel flows.

Q2. A rectangular weir measures:

A) Pressure
B) Flow rate
C) Temperature
D) Viscosity

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Answer: B) Flow rate
Explanation: Rectangular weirs are used in laboratory and field conditions to calculate discharge over a barrier.

Q3. A cylindrical vessel of radius R and height h is completely filled with water. The total pressure on the base is:

A) ρgh
B) ρgπR²h
C) ρgh²
D) ρgR²

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Answer: B) ρgπR²h
Explanation: Total pressure = pressure × area = (ρgh) × (πR²).

Q4. A flow with constant velocity magnitude but changing direction is called:

A) Uniform flow
B) Steady flow
C) Rotational flow
D) Irrotational flow

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Answer: C) Rotational flow
Explanation: When direction changes, vorticity exists — making the flow rotational even if speed is constant.

Q5. The continuity equation in one-dimensional steady flow is:

A) A₁V₁ = A₂V₂
B) A₁/V₁ = A₂/V₂
C) A₁V₁² = A₂V₂²
D) None

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Answer: A) A₁V₁ = A₂V₂
Explanation: Conservation of mass ensures discharge (A×V) remains constant in steady flow.

Q6. For compressible flow, the continuity equation includes:

A) Temperature
B) Density variation
C) Pressure ratio
D) Gravity

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Answer: B) Density variation
Explanation: In compressible flow, density (ρ) varies, so the equation becomes ρ₁A₁V₁ = ρ₂A₂V₂.

Q7. The head loss due to sudden enlargement of pipe is:

A) (V₁ – V₂)² / 2g
B) (V₂ – V₁)² / 2g
C) (V₁ + V₂)² / 2g
D) None

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Answer: A) (V₁ – V₂)² / 2g
Explanation: Energy loss occurs due to eddies and turbulence when pipe cross-section increases suddenly.

Q8. The pressure energy per unit weight of fluid is:

A) p/ρ
B) p/γ
C) pV
D) p×h

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Answer: B) p/γ
Explanation: Pressure energy per unit weight = (pressure) / (specific weight) = p/γ.

Q9. The force exerted by a fluid jet on a stationary flat plate normal to jet is:

A) ρaV²
B) ρaV
C) ρaV²/2
D) ρaV³

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Answer: A) ρaV²
Explanation: Force = rate of change of momentum = mass flow × velocity = ρAV².

Q10. The phenomenon of water hammer occurs due to:

A) Sudden closure of valve
B) Gradual valve opening
C) Air bubbles in flow
D) Cavitation

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Answer: A) Sudden closure of valve
Explanation: When a valve closes suddenly, moving water stops abruptly, creating a high-pressure shock wave called water hammer.

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Fluid Mechanics MCQ Set 10

हर Government Jobs की update के लिए जुड़ें

FLUID MECHANICS MCQ SET 10

Q1. The device used to measure flow rate in an open channel is called:

Q2. A rectangular weir measures:

Q3. A cylindrical vessel of radius R and height h is completely filled with water. The total pressure on the base is:

Q4. A flow with constant velocity magnitude but changing direction is called:

Q5. The continuity equation in one-dimensional steady flow is:

Q6. For compressible flow, the continuity equation includes:

Q7. The head loss due to sudden enlargement of pipe is:

Q8. The pressure energy per unit weight of fluid is:

Q9. The force exerted by a fluid jet on a stationary flat plate normal to jet is:

Q10. The phenomenon of water hammer occurs due to:

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