chemical engineering MCQs – Page 36

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 Review each marked answer and report any item that may be outdated or unclear.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
701. While the oxy-acetylene flame produces a temperature of 3200C, the temperature produced by oxy-hydrogen flame is about _____________ C ?
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A. 2400

B. 2000

C. 1800

D. 3000

702. While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to ______________ Tm (where, Tm Melting temperature) ?
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A. 0.25

B. 0.95

C. 0.70

D. 0.45

703. Pick out the wrong statement ?
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A. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel

B. For a pressure vessel to be classified as thin vessel, the ratio of wall thickness to mean radius

C. Maximum diameter of the opening provided in a pressure vessel, which does not require any

D. meter is used in case of pressure vessel and in structural work</strong>

E. For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole

F. pensation is 200 mm

704. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Youngs modulus, G = Modulus of rigidity or shear modulus v = Poissons ratio) ?
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A. E = G (1 + v)

B. E = 2G (1 + 2v)

C. E = 2G (1 + v)

D. E = G (1 + v)/2

705. Optical activity is a/an _______________________ property ?
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A. Additive

B. Constitutive

C. Both A. & B.

D. Neither A. nor B.

706. The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their__________________?
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A. Molecular weight

B. (Molecular weight)2

C. Equivalent weight

D. (Equivalent weight)2

707. Yield strength of a polycrystalline metal with an average grain size d, is proportional to ____________________?
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A. d-1/2

B. d

C. d1/2

D. d-1

708. The excess air required for the combustion of pulverized coal is of the order of about _______________ percent ?
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A. 30

B. 45

C. 5

D. 15
709. Adhesives__________________?
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A. Cant be used in the form of pressure sensitive tapes

B. Cure instantaneously after application on a surface

C. Cant join two dissimilar metals

D. None of these
710. Function of gear box is to____________________?
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A. Produce high torque

B. Increase the speed

C. Reduce the speed

D. Obtain variable speed
711. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as______________________?
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A. Re0.8, Re0.5

B. Re-0.8, Re0.5

C. Re0.8, Re-0.5

D. Re0.5, Re0.8

712. Shrinkage allowance on pattern is provided to compensate for shrinkage when the _____________________?
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A. Solid phase temperature drops from freezing temperature to the room temperature

B. Metal changes from liquid state to solid state at freezing temperature

C. Liquid metal temperature drops from pouring temperature to room temperature

D. Liquid metal temperature drops from pouring temperature to freezing temperature

713. Cold chisel?s hammers are made of___________________?
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A. High carbon steel

B. Forged steel

C. High speed steel

D. Mild steel

714. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?
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A. Velocity of the fluid

B. Density of the fluid

C. Diameter of the pipe

D. Length of the pipe
715. The following thermocouple may be used for measuring temperature upto 1873K__________________?
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A. Platinum-platinum rhodium

B. Chromel-alumel

C. Copper-constantan

D. Iron-constantan

716. Natural water contains approximately ______________ percent of heavy water?
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A. 0.71

B. 0.015

C. 1.2

D. 3.5

717. Desalination of water__________________?
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A. Means distillation of water

B. Makes it non-potable

C. None of these

D. Makes it potable
718. Pick out the wrong statement ?
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A. In spot welding, two pieces to be joined are overlapped and placed between two electrodes

B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t =

C. Mild steel sheet cannot be spot welded

D. te thickness to be welded)

E. ding

F. Seam welding, projection welding & spot welding are the classification of electrical resistance

719. Name the safety device used to protect the boiler, when the water level falls below a minimum level ?
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A. Blow off cock

B. Safety valve

C. Fusible plug

D. Blow down valve

720. Which of the following materials does not form adherent oxide film on surface ?
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A. Aluminium

B. Nickel

C. Copper

D. Gold & silver