chemical engineering MCQs – Page 323

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 Review each marked answer and report any item that may be outdated or unclear.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
6441. In a stabilised soap bubble, pressure inside it compared to external pressure is________________?
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A. Less

B. More

C. Unpredictable

D. Same

6442. The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?
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A. V

B. 1/V

C. V2

D. 1/V2

6443. The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the ?
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A. Length is shorter

B. Throat diameter is more

C. Sudden expansion of flow in the downstream occurs

D. Distance between the throat and the inlet is more

6444. Water hammer in a pipeline results from the____________________?
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A. None of these

B. Pressure increase due to closure of a valve resulting in decrease in rate of flow

C. Rapid pressure change due to a rapid change in the rate of flow

D. Bursting of pipelines due to closure by a valve

6445. Normal depth in open channel flow is the depth of flow in the channel ____________________?
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A. Measured normal to the channel bed

B. None of these

C. Corresponding to steady flow

D. Corresponding to uniform flow
6446. f = 16/NRe, is valid for__________________?
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A. Steady flow

B. Laminar flow through an open channel

C. None of these

D. Turbulent flow

6447. Momentum correction factor used in fluid flow problems accounts for the__________________?
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A. Change in pressure

B. Non uniform direction of velocities at inlet & outlet sections

C. Change in total energy

D. Change in direction of flow

6448. Curve III in the bellow diagram represents a/an________________?
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A. Ideal plastic

B. Pseudo plastic fluid

C. None of these

D. Dilatent fluid

6449. Velocity distribution for flow between two fixed parallel plates_________________?
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A. Is zero at the plates and increases linearly to the mid-plane

B. None of these

C. Varies parabolically across the section

D. Is constant over the entire cross-section

6450. A piezometer opening measures the _____________ fluid pressure?
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A. Undisturbed

B. Dynamic

C. Static

D. Total

6451. The Reynolds number for an ideal fluid flow is _________________?
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A. ?

B. 2100-4000

C. 4

D. 4000

6452. Fanning friction factor is equal to (where, fB = Blasius friction factor) ?
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A. fB/4

B. 4fB

C. fB/2

D. 2fB

6453. Cavitation occurs in a centrifugal pump when the suction pressure is________________?
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A. Equal to the vapour pressure

B. Greater than the vapour pressure of the liquid at that temperature

C. Equal to the developed head

D. Less than the vapour pressure of the liquid at that temperature
6454. Medium viscosity lubricating oil can be most ideally pumped by a ______________ pump?
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A. Plunger

B. Piston

C. Centrifugal

D. Vane
6455. Unsteady non-uniform flow is represented by flow through a/an_________________?
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A. Long pipe at constant rate

B. Expanding tube at increasing rate

C. Expanding tube at constant rate

D. Long pipe at decreasing rate

6456. The velocity profile for turbulent flow through a closed conduit is_______________?
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A. Hyperbolic

B. Linear

C. Logarithmic

D. Parabolic

6457. The energy equation, E + (p/?) + (V2/2g) + gZ = constant (E = internal energy/mass), is applicable to___________________?
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A. Perfect gases only

B. All compressible fluids

C. Adiabatic unsteady flow of gases

D. Isothermal flow of gases

6458. For the same flow rate of a fluid, the pressure drop is the least for ____________________?
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A. Venturimeter

B. ?p is same for all

C. Orificemeter

D. Flow-nozzle

6459. The momentum correction factor for the velocity distribution of laminar flow is____________________?
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A. None of these

B. 1.66

C. 2.5

D. 1.3

6460. The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stokes law regime?
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A. 1

B. 0.5

C. 1.5

D. 2