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chemical engineering fluid mechanics for chemical chemical engineering MCQs

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 Review each marked answer and report any item that may be outdated or unclear.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

1. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis. The centre of pressure of a rectangular surface (of width w) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?
0

A. 3y/4

B. 1/(y/4)

C. 2y/3

D. 1/(y/3)

2. The speed of a sound wave in a gas is analogous to the speed of ______________________?
0

A. Flow in an open channel

B. A disturbance travelling upstream in moving fluid

C. An elementary wave in an open channel

D. None of these

3. Pressure co-efficient is the ratio of pressure forces to __________________________ forces?
0

A. Gravity

B. Viscous

C. Inertial

D. None of these

4. For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance d measured from the centre line of the pipe, and it follows a ______________ relationship?
0

A. Linear

B. Hyperbolic

C. Parabolic

D. Logarithmic

5. What is the value of Fanning friction factor f for smooth pipe at NRe = 106 approximately ?
0

A. 0.1

B. 0.01

C. 0.3

D. 0.003

6. What is the maximum theoretical suction lift (metres) of a reciprocating pump ?
0

A. 5

B. 100

C. 10

D. 50

7. Drag is defined as the force exerted by the___________________?
0

A. None of these

B. Fluid on the solid in the direction of flow

C. Fluid on the solid in a direction opposite to flow

D. Solid on the fluid

8. Which of the following is used for very accurate measurement of flow of gas at low velocity ?
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A. Pitot tube

B. Segmental orificemeter

C. Hot wire anemometer

D. Rotameter

9. A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by________________?
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A. Decreasing the size of the inlet pipe

B. Increasing the size of the inlet pipe

C. Lowering the pump position

D. Both B. and C.

10. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?
0

A. 10

B. 1000

C. 2000

D. 100

11. Stokes law is valid, when the particle Reynolds number is ______________________?
0

A. < 1

B. < 5

C. > 1

D. None of these

12. At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ?
0

A. 20 and 120

B. 45 and 60

C. 40 and 140

D. 90 and 80

13. One poise (unit of absolute/dynamic viscosity) is equivalent to one_____________________?
0

A. gm/cm. sec

B. gm/cm2. sec

C. cm2/sec

D. m2/sec

14. As per Newtons law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, ? = fluid viscosity) ?
0

A. 1/?

B. 1/?2

C. ?

D. ?2

15. Which of the following equations is valid for laminar flow of a fluid through packed bed ?
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A. Kozeny Karman equation

B. Blake-Plummer equation

C. Fanning equation

D. Hagen-Poiseuille equation

16. The blades of a centrifugal impeller are said to be curved forward, if the ____________ of the motion of impeller blades?
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A. Outlet tip of a blade curves in a direction opposite to that

B. Inlet tip of a blade curves in a direction opposite to that

C. Outlet tip of a blade is towards the direction

D. Inlet tip of a blade is towards the direction

17. In isotropic turbulence, the _____________ are equal to each other?
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A. None of these

B. Root mean square of velocity fluctuations in the three co-ordinate directions

C. Temporal velocity components

D. Mean square of velocity fluctuations in the three co-ordinate directions

18. Plunger pumps are used for__________________?
0

A. None of these

B. Higher pressure

C. Slurries

D. Viscous mass

19. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________?
0

A. Increase

B. Remain same

C. Decrease

D. Unpredictable

20. Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newtons law of viscosity. (II) Newtons second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary?
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A. I, II, III

B. II, III, V

C. I, II, V

D. II, IV, V

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