chemical engineering MCQs – Page 347

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 Review each marked answer and report any item that may be outdated or unclear.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
6921. In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________?
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A. Dependent on fluid density

B. Dependent on fluid viscosity

C. Dependent on its cross-sectional area

D. The velocity of sound
6922. Cast iron detachable joint is used in __________ pipes.
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A. Cast iron

B. Reinforced cement concrete

C. Steel

D. Asbestos cement

6923. Bog iron used for the adsorption of H2S from coke oven gas is___________________?
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A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)

B. None of these

C. Iron impregnated with resin (usually Bakelite)

D. Carbon free iron

6924. Cast iron is__________________?
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A. Used for making shock resisting parts

B. Having compressive strength more than its tensile strength

C. Manufactured in cupola and is brittle

D. All A., B. & C.
6925. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of__________________?
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A. High silicon cast iron

B. Nickel clad steel

C. Aluminium

D. Stainless steel or glass lined steel
6926. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides x & y is given by_________________?
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A. (x + y)/2xy

B. 2xy/(x + y)

C. (x + y)/xy

D. xy/(x + y)

6927. 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 ?
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A. 0.67

B. 1

C. 2

D. 0.5

6928. Specific speed of a centrifugal pump depends upon the ______________ head?
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A. None of these

B. Delivery

C. Manometric

D. Suction

6929. Centrifugal pump made of pyrex or glass cant be used to pump___________________?
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A. Brine

B. Alkaline solutions

C. Dilute H2SO4 at room temperature

D. Milk and fruit juices

6930. A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x?? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?
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A. VX = V0 + q (x3/L2D)

B. VX = V0 + 2q (x2/LD)

C. VX = V0 + ?q (x3/L2)

D. VX = V0 + (4/3) q (x3/L2D)
6931. Metalloid is_______________________?
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A. An element, which exhibits the properties of both metal & non metal

B. Highly electronegative in nature

C. An alloy

D. All A., B. & C.

6932. The dimension of surface tension is________________?
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A. ML-2

B. ML-2T

C. MT-2

D. MLT-2

6933. For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________?
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A. R

B. R0.5

C. R2

D. R4
6934. Iron alloyed with carbon upto 2% is called___________________?
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A. Pig iron

B. Wrought iron

C. None of these

D. High carbon steel

6935. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?
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A. 25.61 kPa

B. 21.13 kPa

C. 11.77 kPa

D. 14.86 kPa

6936. Anodic material used for the cathodic protection of underground buried steel pipeline is_________________?
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A. Zinc or magnesium

B. Brass

C. Bronze

D. Nickel or copper

6937. The most economical flow control valve for use with large diameter pipes is a__________________?
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A. Needle valve

B. Butterfly valve

C. Globe valve

D. None of these

6938. Spark plugs are made of______________________?
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A. Carborundum

B. Metallic carbides

C. Corundum

D. High alumina ceramic
6939. Which of the following is the hardest material ?
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A. Topaz

B. Quartz

C. Fluorite

D. Corundum
6940. Bearings subjected to light load are made of________________?
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A. Silicon bronze

B. Phosphorous bronze

C. White metal

D. Monel