chemical engineering MCQs – Page 339

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 Review each marked answer and report any item that may be outdated or unclear.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

6761. When a fluid flows over a solid surface, the___________________?
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A. Velocity is not zero at the solid surface

B. Velocity is uniform at any cross-section

C. ers themselves

D. Velocity gradient is zero at the solid surface

E. Resistance between the surface & the fluid is lesser as compared to that between the fluid

6762. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?
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A. Suction

B. Suction minus vapor pressure of the liquid at suction temperature

C. Discharge

D. Discharge minus vapor pressure of the liquid at the discharge temperature

6763. With increase in the temperature, viscosity of a liquid____________________?
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A. May increase or decrease; depends on the liquid

B. Remain constant

C. Decreases

D. Increases

6764. Steady flow occurs, when the__________________?
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A. Conditions change steadily with time

B. Conditions do not change with time at any point

C. Rate of the velocity change is constant

D. Conditions are the same at the adjacent points at any instant

6765. Maximum permissible sulphur content in steel is ______________ percent?
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A. 0.805

B. 0.055

C. 0.015

D. 0.505

6766. Lead lined equipments & vessels are suitable for handling __________________?
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A. All A., B. and C.

B. Hydrochloric acid (10%)

C. Sulphuric acid upto 60C

D. Nitric acid

6767. Which of the following is produced by condensation polymerisation ?
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A. Bakelite

B. Polystyrene

C. Polythene

D. Poly vinyl chloride

6768. Which one occupies the lowermost position in the electromotive series of metals ?
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A. Aluminium

B. Noble metals (Ag, Pt, Au)

C. Alkali metals (K, Na, Li)

D. Zinc

6769. Mild steel is a/an _____________ steel?
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A. High carbon

B. Medium carbon

C. Low carbon

D. High alloy

6770. Hastelloy comprises of____________________?
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A. Molybdenum and nickel

B. Copper and nickel

C. Copper and tin

D. Lead and tin

6771. Age hardening of duralumin is due to____________________?
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A. Copper

B. Magnesium

C. Both A. & B.

D. Neither A. nor B.

6772. Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its________________?
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A. Inner diameter

B. Neither inner nor outer diameter

C. Outer diameter

D. Thickness

6773. The electrical conductivity of a ______________ decreases with rise in temperature?
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A. Metal/alloy

B. Dielectric

C. Semi-conductor

D. None of these

6774. Among the tin containing alloys, ______________ consumes the maximum amount of tin?
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A. Pewter metal

B. Solder

C. Bronzes

D. White metal

6775. A globe valve is the most suitable for applications, in which____________________?
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A. Fluid contains dispersed solid particles

B. Fluid flow control is required

C. Valve is required to be either fully open or fully closed

D. One way flow is required

6776. Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
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A. Acetic acid

B. Concentrated H2SO4

C. Dilute HCl

D. None of these

6777. Semi steel is__________________?
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A. Produced by adding 10-20% steel to the cupola charge

B. Stronger than cast iron

C. Both A. and B.

D. Neither A. nor B.

6778. Viscosity of water is about _____________ times that of air at room temperature?
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A. 15

B. 155

C. 1050

D. 55

6779. Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is _____________ percent?
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A. 0.2

B. 0.35

C. 0.02

D. 0.5

6780. The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?
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A. ?(Ro-Ri)

B. Ro + Ri

C. 2(Ro-Ri)

D. 4(Ro-Ri)

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