chemical engineering MCQs – Page 307

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 Review each marked answer and report any item that may be outdated or unclear.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
6121. The head loss due to sudden contraction is proportional to___________________?
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A. Velocity head

B. None of these

C. Velocity

D. Turbulence

6122. Porosity of silica bricks varies from ______________ percent?
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A. 60 to 75

B. 5 to 10

C. 20 to 30

D. 45 to 60

6123. High porosity refractory bricks have _______________?
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A. Poor resistance to the penetration of molten slag, metal & flue gases

B. All A., B. and C.

C. Better thermal spalling resistance

D. Poor heat conductivity & low strength

6124. Magnesite chrome refractories____________________?
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A. Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase

B. Have better spalling resistance than chrome magnesite refractories

C. Have very low thermal co-efficient of expansion

D. m

E. Are not at all resistant to the corrosive action of iron oxide

6125. In isotropic turbulence, the _____________ are equal to each other?
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A. Root mean square of velocity fluctuations in the three co-ordinate directions

B. Temporal velocity components

C. None of these

D. Mean square of velocity fluctuations in the three co-ordinate directions
6126. Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?
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A. 5

B. 0.5

C. 50

D. 500

6127. Poise is converted into stoke by ___________________?
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A. Dividing by specific gravity

B. Dividing by density (gm/c.c)

C. Multiplying with density (gm/c.c)

D. Multiplying with specific gravity

6128. Silica bricks have low spalling resistance below 600C, due to its________________?
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A. Low refractoriness

B. High thermal diffusivity

C. Very high thermal conductivity

D. High co-efficient of expansion upto this temperature
6129. Existence of boundary layer in fluid flow is because of the_________________?
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A. Surface tension

B. Fluid density

C. Gravity forces

D. Fluid viscosity
6130. In a free vortex, the_____________________?
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A. Stream lines are not circular

B. Velocity changes linearly with radial distance

C. Radial component of velocity is same everywhere

D. Flow is necessarily rotational

6131. What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes ?
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A. Angular deformation

B. Rotation

C. Linear deformation

D. Translation

6132. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
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A. High strength and density

B. High resistance to spalling

C. All A., B. and C.

D. High refractoriness
6133. An isentropic process is the one, in which_________________?
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A. None of these

B. pvr = constant, and process is reversible

C. pv = constant

D. pvr= constant

6134. High density refractory bricks have lower__________________?
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A. Spalling resistance

B. Fusion point

C. Slag penetration resistance

D. Thermal conductivity

6135. Rate of slag attack on refractories increases with rise in temperature due to the___________________?
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A. Decreased viscosity of slag

B. None of these

C. Oxidising condition in the furnace

D. Increased thermal conductivity of brick

6136. In deriving Bernoullis equation, fluid is assumed to be________________?
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A. Incompressible, frictionless, steady, along a streamline

B. None of these

C. Steady, density being pressure dependent, frictionless

D. Uniform, steady, incompressible, along a streamline

6137. Mach number is the ratio of the speed of the _____________________?
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A. Sound to that of the fluid

B. Fluid to that of the sound

C. Light to that of the fluid

D. Fluid to that of the light

6138. Which is the most efficient and best for measuring very small flow rate of gases ?
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A. Flow nozzle

B. Rotameter

C. Orificemeter

D. Venturimeter

6139. Slurries can be most conveniently pumped by a _______________ pump?
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A. Screw

B. Gear

C. Centrifugal

D. Reciprocating

6140. ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
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A. RUL

B. Porosity

C. Specific gravity

D. Thermal conductivity