chemical engineering MCQs – Page 327

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 Review each marked answer and report any item that may be outdated or unclear.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

6521. The kinetic energy correction factor for velocity distribution of laminar flow is_________________?
0

A. 1

B. 1.66

C. 2

D. 0.5

6522. Nominal size of the discharge pipe of a pump is usually _____________ the nominal size of the inlet pipe?
0

A. Larger than

B. Smaller than

C. Same as

D. Twice

6523. The schedule number of a pipe is an indication of its_________________?
0

A. Roughness

B. Size

C. Material density

D. Wall thickness

6524. In fluid flow, the boundary layer separation cannot occur___________________?
0

A. In laminar flow

B. None of these

C. At points of abrupt changes in the flow directions

D. In case of boundaries experiencing form drag

6525. In case of centrifugal fan or blower, the gas capacity varies as __________________?
0

A. (Speed)0.5

B. Speed

C. (Speed)3

D. (Speed)2

6526. Fanning equation is given by (?P/?) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow?
0

A. Transition

B. Laminar

C. Turbulent

D. Both B. and C.

6527. Which of the following is not concerned with the fluid-particle interaction ?
0

A. Froude number

B. Weber number

C. Galileo number

D. Drag co-efficient

6528. For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________?
0

A. Union

B. Elbow

C. Reducer

D. Tee

6529. Bernoullis equation describes the _______________?
0

A. Kinetic energy balance in laminar flow

B. Mechanical energy balance in potential flow

C. Mechanical energy balance in turbulent flow

D. Mechanical energy balance in boundary layer

6530. Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?
0

A. Elastic

B. Gravity

C. Viscous

D. None of these

6531. Pipes having diameter 14 inches or more are designated by their_________________?
0

A. Inside diameter

B. Outside diameter

C. None of these

D. Schedule number

6532. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?
0

A. Decrease in effect

B. Develops noise

C. Increase in thrust

D. Develops high pressure

6533. The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?
0

A. 0.5

B. 2

C. 1

D. 1.5

6534. For an unstable equilibrium of a floating body (where, M = metacentre.) ?
0

A. M is above G

B. M is below G

C. None of these

D. M & G coincide

6535. A fluid (?/?) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?
0

A. 700

B. 7

C. 630

D. 7000

6536. The speed of sound in an ideal gas varies as the __________________?
0

A. None of these

B. Temperature

C. Density

D. Pressure

6537. Major loss in sudden contraction in pipe flow is due to ________________?
0

A. Boundary friction

B. Flow contraction

C. None of these

D. Expansion of flow after sudden contraction

6538. The ratio of the wall drag to the form drag in the Stokes law range (for motion of spherical particles in a stationary fluid) is__________________?
0

A. 0.33

B. 2

C. 1

D. 0.5

6539. Air vessel provided in a reciprocating pump__________________?
0

A. Increases the volumetric efficiency of the pump

B. None of these

C. Smoothens the flow by avoiding pulsations

D. Saves the pump from the danger of cavitation

6540. Various efficiencies of a centrifugal pump are related as (where, ?m = mechanical efficiency ?v = volumetric efficiency. ?ma = manometric efficiency ?o = overall efficiency) ?
0

A. ?ma = ?m ?v

B. ?m = ?v . ?ma

C. ?ma ?m ?v = ?o

D. ?v = ?m ?ma

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