chemical engineering MCQs – Page 33

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 Review each marked answer and report any item that may be outdated or unclear.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

641. _______________ number determines whether the fluid flow in an open channel is super-critical, critical or sub-critical ?
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A. Froude

B. Mach

C. Reynolds

D. Weber

642. Air standard Otto cycle is more efficient than the diesel cycle for the same__________________?
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A. Cylinder dimension & rpm

B. Heat addition & compression ratio

C. Compression ratio & pressure

D. Heat addition & pressure

643. Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is__________________?
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A. Green

B. Silver grey

C. Black

D. Yellow

644. As per international norms, the maximum permissible value of noise level in the industrial environment is _____________ decibels as measured at a distance of 1.5 meters from the source of noise?
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A. 45

B. 110

C. 85

D. 60

645. What is the percentage of chromium in 18-4-1 high speed steel ?
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A. 4

B. 1

C. 23

D. 18

646. Which of the following if present in iron ore, enhances its value ?
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A. Lime & Magnesia

B. None of these

C. Alumina

D. Alkali oxide

647. Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?
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A. Fracture

B. Slip

C. Winning

D. Dislocation

648. Production of one ton of paper in Indian paper industry consumes about ____________ kWh of electricity ?
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A. 1400

B. 2000

C. 300

D. 800

649. Potable water means the water used for____________________?
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A. Evaporation to produce steam

B. Cooling

C. Drinking

D. Fire-fighting

650. The order of a chemical reaction____________________?
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A. Can be determined from the stoichiometry of the reaction

B. Cannot be zero

C. Can be fractional

D. Can be determined only experimentally

651. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is___________________?
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A. Same

B. Much more

C. Slightly more

D. Slightly less

652. Which of the following gases cause global warming ?
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A. Carbon monoxide

B. Carbon dioxide

C. Nitrogen

D. Ozone

653. Which of the following is resistant to the action of both heat & chemicals ?
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A. Borosilicate glass

B. Silica glass

C. None of these

D. Soda lime glass

654. Hardening of steel is not possible, unless it is heated _________________ critical point ?
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A. Between the first & second

B. Above the highest

C. Above the lowest

D. Between the second & third

655. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?
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A. Hot starting

B. Vapour locking

C. All A, B & C

D. Spark plug fouling

656. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by_________________?
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A. Decreasing the surface area of the electrodes

B. Increasing the concentration of copper sulphate solution

C. Increasing the surface area of the electrodes

D. Increasing the concentration of zinc sulphate solution

657. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the _______________ allowance ?
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A. Pattern

B. Casting

C. Draft

D. Distortion

658. Which of the following mainly decides the current to be employed is arc welding ?
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A. Plate thickness

B. Welded portion length

C. Electrode size

D. Voltage across the arc

659. Spheroidising of a material is a/an ________________ process?
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A. Normalising

B. Hardening

C. Tempering

D. Annealing

660. Which one is neutral in character ?
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A. N2O

B. N2O4

C. N2O5

D. N2O3

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