chemical engineering MCQs – Page 337

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
6721. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?
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A. 0.001

B. 0.01

C. 0.1

D. 1

6722. A pipe is defined as hydraulically smooth, if the friction factor_________________?
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A. For a given Reynolds number remains constant even on further smoothening of the pipe

B. Is zero irrespective of the Reynolds number

C. None of these

D. Is not a function of Reynolds number

6723. In the Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?
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A. Independent of

B. Inversely proportional to

C. Inversely proportional to the square root of

D. Directly proportional to

6724. Cd for the orifice plate varies from ___________________?
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A. 0.58 to 0.8

B. 0.93 to 0.98

C. 0.2 to 0.3

D. 0.02 to 0.03

6725. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ?
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A. None of these

B. Decreases as V2

C. Decreases linearly with V

D. Increases linearly with V
6726. In case of supersonic flow of a fluid through pipeline, the Mach number is__________________?
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A. 0

B. > 1

C. < 1

D. 1

6727. Volume of liquid displaced by a floating body is equivalent to its_________________?
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A. Submerged weight

B. Own weight

C. Own volume

D. Submerged volume

6728. The rate of change of moment of momentum represents the ______________ by the fluid?
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A. Force exerted

B. Power developed

C. Work done

D. Torque applied
6729. If more than two branches of pipes are to be connected at the same point, then use a/an_________________?
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A. Union

B. Elbow

C. None of these

D. Tee
6730. Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.
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A. ?/?s = 0

B. ?/?s = constant

C. ?/?t = 0

D. ?/?t = constant

6731. The discharge co-efficient for an orifice meter does not depend upon the ___________________?
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A. Pipe diameter

B. Pipe length

C. Type of orifice & the Reynolds number

D. Ratio of pipe diameter to orifice diameter

6732. What is the normal range of exit cone angle of a Venturimeter ?
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A. >25

B. 7 to 15

C. 2 to 5

D. 15 to 25

6733. 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, accelerating flow

B. Re >>1, decelerating flow

C. Re << 1, decelerating flow

6734. An ideal nozzle design aims at________________?
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A. Minimising wall friction

B. Suppressing boundary layer separation

C. Both A. & B.

D. Neither A. nor B.

6735. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?
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A. Velocity and relative roughness

B. Reynold number, relative roughness and head loss

C. Head loss and velocity

D. Reynolds number and friction factor

6736. Slugging in a fluidised bed can be avoided by using_____________________?
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A. Shallow beds of solids and proper choice of particle size

B. Tall narrow vessel

C. Very large particles

D. Deep bed of solids

6737. Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?
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A. Depends mainly on cross-sectional shape

B. Is primarily a friction drag

C. Occurs when NRe is very small

D. Is independent of body length

6738. In case of a ____________ the energy of flow is considerably decreased downstream of the machine?
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A. Centrifugal pump

B. Centrifugal fan

C. Turbine

D. Blower

6739. Dimension of surface tension is (where, F = force, L = length) ?
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A. F-1. L

B. F.L-2

C. F-2. L

D. FL-1
6740. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________?
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A. 0.5

B. 1

C. -1

D. -0.5