chemical engineering MCQs – Page 302

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 Review each marked answer and report any item that may be outdated or unclear.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

6021. For turbulent flow of an incompressible fluid through a pipe, the flow rate Q? is proportional to (? P)n, where ?P is the pressure drop. The value of exponent n is_________________?
0

A. > 1

B. 1

C. < 1

D. 0

6022. Natural silica___________________?
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A. All A., B. and C.

B. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high

C. Is not stable at high temperature

D. Mainly contains quartz

E. ume changes

6023. The speed of a sound wave in a gas is analogous to the speed of ______________________?
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A. A disturbance travelling upstream in moving fluid

B. None of these

C. Flow in an open channel

D. An elementary wave in an open channel

6024. Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?
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A. Leakage & pressure decreasing at higher elevations

B. Specific gravity & temperature of the liquid

C. Frictional resistance through pipes, fittings & passages

D. All A., B. and C.

6025. Hot blast main (carrying air at 1000C) in blast furnace are lined with ______________ bricks?
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A. Zirconia

B. Magnesite

C. Fireclay

D. Silica

6026. Applicability of Bernoullis equation is limited to a/an _____________ fluid, that does not exchange shaft work with the surroundings?
0

A. Incompressible

B. Non-viscous

C. Both A. and B.

D. Neither A. nor B.

6027. Fluid flow through a packed bed is represented by the ______________ equation?
0

A. Erguns

B. None of these

C. Fannings

D. Hagen-Poiseuilles

6028. Fireclay bricks are used in the__________________?
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A. Outer lining of L.D. converter

B. Hearth bottom of blast furnace

C. Coke oven walls

D. Coke ovens regenerator

6029. Roof of a basic electric furnace is made of _____________ bricks?
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A. Superduty fireclay

B. Chromite

C. Silica

D. None of these

6030. What is the maximum theoretical suction lift (metres) of a reciprocating pump ?
0

A. 10

B. 50

C. 100

D. 5

6031. Mullite is chemically represented by_________________?
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A. 3Al2O3. 2SiO2

B. Al2O3. SiO2

C. Al2O3. 2SiO2

D. 2Al2O3. 3SiO2

6032. The pressure co-efficient is the ratio of pressure forces to ______________ forces?
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A. Inertial

B. Viscous

C. Surface tension

D. Gravity

6033. Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?
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A. f1 < f2

B. Data not sufficient to relate f1 & f2

C. f1 = f2

D. f1 > f2

6034. Cold crushing strength of a refractory does not depend upon its ____________________?
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A. Shape

B. Composition

C. Firing temperature

D. Texture

6035. In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________?
0

A. V1.8

B. V

C. V-1

D. V-0.8

6036. Which of the following is not a dimension-less parameter ?
0

A. Kinematic viscosity

B. Pressure-co-efficient

C. Froude number

D. Weber number

6037. In magnetic flow meters, voltage generation is________________?
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A. Due to the motion of conducting fluid through an externally generated uniform field

B. Proportional to the fluid velocity

C. Both A. and B.

D. Neither A. nor B.

6038. Tar dolomite bricks are used in the_________________?
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A. Electric furnaces

B. All A., B. and C.

C. Basic open hearth furnace

D. Basic Bessemer converter

6039. Fanning friction factor equation applies to the _____________ fluid flow?
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A. Non-isothermal condition of

B. Compressible

C. Both A. and B.

D. Neither A. nor B.

6040. Which of the following is most prone to pulsating discharge flow ?
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A. Gear pump

B. Centrifugal pump

C. Axial flow pump

D. Reciprocating pump

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