chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 28

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
541. For flow of fluids through packed bed, the superficial velocity is_________________?
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A. Dependent on the pressure drop across the bed

B. Same as the average velocity through channels

C. More than the average velocity through channels

D. Less than the average velocity through channels
542. The pitot static tube does not measure the _____________ pressure?
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A. All A., B. and C.

B. Static

C. Difference in static & dynamic

D. Total

543. The pressure drop per unit length of pipe incurred by a fluid X flowing through pipe is ?p. If another fluid Y having both the specific gravity & density just double of that of fluid X, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?
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A. 2?p

B. ?p2

C. ?p/2

D. ?p

544. In case of centrifugal fan or blower, the gas capacity varies as __________________?
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A. (Speed)2

B. Speed

C. (Speed)0.5

D. (Speed)3

545. The temperature in isentropic flow_______________?
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A. Cannot drop and then increase again downstream

B. Depends on Mach number only

C. None of these

D. Does not depend on Mach number

546. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its __________________?
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A. Ratio of absolute viscosity to density

B. Absolute viscosity

C. Density

D. Reynolds number

547. The Prandtl Pitot tube measures the__________________?
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A. Pressure difference in pipe flow

B. Pressure at a point

C. Average flow velocity

D. Velocity at a point in the flow
548. Pipes having diameter 14 inches or more are designated by their_________________?
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A. Schedule number

B. Outside diameter

C. Inside diameter

D. None of these

549. The dimension of kinematic viscosity is_________________?
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A. ML-2T-2

B. L2T-1

C. ML-2T-1

D. None of these

550. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ?
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A. Increasing the impeller speed and the volute area

B. Mounting of two or more impellers in series on a single shaft

C. Increasing the number of vanes in the impeller

D. Either of A., B. or C.

551. The discharge co-efficient for an orifice meter does not depend upon the ___________________?
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A. Type of orifice & the Reynolds number

B. Ratio of pipe diameter to orifice diameter

C. Pipe length

D. Pipe diameter

552. For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?
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A. V1 < V2 < V3

B. V2 > V1 and V2 > V3

C. None of these

D. V1 > V2 > V3

553. Check valves are used_______________?
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A. At high pressure

B. In bends

C. For controlling water flow

D. For unidirectional flow
554. For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?
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A. ?(2gh)

B. Cd ?(2gh)

C. C.V. ?(2gh)

D. Cc ?(2gh)

555. Reciprocating pumps compared to centrifugal pumps__________________?
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A. Can handle slurries more efficiently

B. Are not subject to air binding

C. Can be operated with delivery valve closed

D. Deliver liquid at uniform pressure

556. Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)?
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A. None of these

B. Cd = Cc.Cv

C. Cd = Cc/Cv

D. Cd = Cv/ Cc

557. Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an _____________ manometer?
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A. Inclined tube mercury

B. U-tube water

C. Inclined tube water

D. U-tube mercury

558. Manometers measure the ______________ pressure?
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A. Vacuum as well as the atmospheric

B. Absolute

C. Difference in

D. Gage

559. The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?
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A. Barometric pressure

B. Speed of the impeller

C. Diameter of the impeller

D. Both B. and C.

560. Boundary layer separation is characterised by one of the conditions given below, where Re is the Reynolds number for the flow. Select the appropriate conditions ?
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A. Re >>1, decelerating flow

B. Re << 1, decelerating flow

C. Re <> 1, accelerating flow