Fluid Mechanics MCQ Questions & Answers

41

The resistance wire used in a hot wire anemometer for conducting electrical current is made of

A) Copper B) Tungsten C) Chromium D) Aluminium

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Answer & Solution

Answer: Option B

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42

Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

A) Manometric B) Total C) Static D) Friction

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Answer & Solution

Answer: Option A

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43

The Mach number for hypersonic flow of compressible fluid is

A) 1 B) > 1 C) > 4 D) < 2

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Answer & Solution

Answer: Option C

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44

Which of the following is used for very accurate measurement of flow of gas at low velocity?

A) Pitot tube B) Rotameter C) Segmental orificemeter D) Hot wire annemometer

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Answer & Solution

Answer: Option D

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45

For laminar flow through a closed conduit

A) V_max = 2V_av B) V_max = V_av C) V_max = 1.5V_av D) V_max = 0.5V_av

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Answer & Solution

Answer: Option A

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46

Shear stress in a fluid flowing in a round pipe

A) Varies parabolically across the cross-section B) Remains constant over the cross-section C) Is zero at the centre and varies linearly with the radius D) Is zero at the wall and increases linearly to the centre

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Answer & Solution

Answer: Option C

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47

Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

A) For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter B) Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter C) Venturimeter occupies less space than an orificemeter D) Venturimeter incurs less power loss compared to an equivalent orificemeter

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Answer & Solution

Answer: Option C

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48

Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

A) Increase B) Decrease C) Remain unchanged D) Data insufficient to predict relative pressure drop

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Answer & Solution

Answer: Option B

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49

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :
Δ P/L = 375 x 10³ V_OM + 10.94 x 10⁶ V²_OM (SI units)
If water is to be used as the fluidising medium, the minimum fluidisation velocity, V_OM is

A) 12 mm/s B) 16 mm/s C) 24 mm/s D) 28 mm/s

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Answer & Solution

Answer: Option B

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50

A venturimeter can not be used for the direct measurement of

A) Datum difference in the stretch of pipeflow B) Pressure difference in the flow throughpipeline C) Friction loss in pipe flow D) All of the above

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Answer & Solution

Answer: Option D

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering