chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 36

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 Review each marked answer and report any item that may be outdated or unclear.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
701. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?
comments icon0

A. 0.5

B. 1

C. 2

D. 0.67

702. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides x & y is given by_________________?
comments icon0

A. xy/(x + y)

B. 2xy/(x + y)

C. (x + y)/xy

D. (x + y)/2xy

703. Specific speed for a centrifugal pump is___________________?
comments icon0

A. N ?Q/H

B. N ?Q/H3/4

C. N3D5/H1/3

D. N ?Q/H2/3

704. Rubber latex is an example of a ______________ fluid?
comments icon0

A. Dilatent

B. Bingham plastic

C. Pseudo plastic

D. Newtonian

705. Which is not a variable head meter _________________?
comments icon0

A. None of these

B. Pitot tube

C. Rotameter

D. Venturimeter

706. For laminar flow through a closed conduit____________________?
comments icon0

A. Vmax = Vav

B. Vmax = 0.5Vav

C. Vmax = 2Vav

D. Vmax = 1.5Vav

707. Creeping flow around a sphere is defined, when particle Reynolds number is___________________?
comments icon0

A. < 2100

B. < 500

C. > 2.5

D. < 0.1
708. In the low Reynolds number region, the drag force on a sphere is proportional to_______________?
comments icon0

A. V0.5

B. V2

C. V4

D. V
709. The continuity equation___________________?
comments icon0

A. None of these

B. Represents the conservation of mass

C. Is dependent upon the viscosity of the fluid

D. Is independent of the compressibility of the fluid

710. The most economical flow control valve for use with large diameter pipes is a__________________?
comments icon0
A. Butterfly valve

B. Globe valve

C. None of these

D. Needle valve

711. Buckingham-? theorem states that in any physical problem including n quantities having m dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?
comments icon0

A. m

B. n

C. n/m

D. n-m
712. Pick out the correct statement?
comments icon0

A. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total

B. ume to the volume of voids in the bed

C. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under

D. Mach number in an incompressible fluid is always unity

E. Fanning friction factor is inversely proportional to Reynolds number always

F. ditions of flow</strong>

713. Venturimeter and orificemeter measures the _____________ of the fluid?
comments icon0

A. Maximum velocity

B. Point velocity

C. Average velocity

D. Pressure

714. For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?
comments icon0

A. Equal

B. Less

C. More

D. Independent of porosity

715. Foot valve provided in the pump is a ______________ valve?
comments icon0

A. Relief

B. Direction control

C. Pressure reduction

D. Back pressure
716. At low Reynolds number______________?
comments icon0

A. Viscous forces are unimportant

B. Gravity forces control

C. Viscous forces control and inertial forces are unimportant

D. Viscous forces control

717. Which of the following is an undesirable property of a manometric liquid ?
comments icon0

A. Low viscosity & surface tension

B. High vapour pressure

C. Low co-efficient of thermal expansion

D. Non-sticky & non-corrosive nature

718. The maximum head that can be developed by a single impeller is _____________ ft?
comments icon0

A. 100

B. 1000

C. 250-300

D. 25

719. In frictional fluid flow, the quantity, (P/?) + (V2/2gc) + gz/gc) is___________________?
comments icon0

A. Increased in the direction of flow

B. Not constant along a streamline

C. Constant along a streamline

D. None of these

720. An equipotential line is _____________ to the velocity vector at every point?
comments icon0
A. Normal

B. None of these

C. Tangential

D. Parallel