chemical engineering chemical engineering basics MCQs – Page 33

Practise multiple-choice questions from chemical engineering chemical engineering basics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
641. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
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A. Lower, as it gives shorter wavelength

B. Higher, as it gives shorter wavelength

C. Lower, as it gives higher wavelength

D. Higher, as it gives higher wavelength

642. Blow off cock is provided in steam boiler to ____________________?
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A. Regulate the supply of water in boiler

B. Guard the boiler in case of abnormal rise in steam pressure

C. Drain out water and sludge during its repair

D. Put out the fire in the furnace when the water level in the boiler falls to unsafe limit

643. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?
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A. 12.5 : 1

B. 18.5 : 1

C. 9.5 : 1

D. 15.5 : 1

644. The order of a chemical reaction____________________?
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A. Cannot be zero

B. Can be fractional

C. Can be determined from the stoichiometry of the reaction

D. Can be determined only experimentally

645. The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6) ?
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A. 2.4

B. 8.4

C. 5.6

D. 4.4
646. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system_________________?
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A. Employs minimum quantity of refrigerant

B. Has very high C.O.P.

C. Is as light as possible

D. Consumer minimum horse power

647. Removal of non-condensable from steam or other vapour is termed as the ________________ process?
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A. Deaeration

B. Exhaust

C. Condensation

D. Scavenging

648. If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ?
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A. Enthalpy

B. Temperature

C. Internal energy

D. Entropy
649. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.K respectively ?
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A. 2

B. 40

C. 8

D. 10

650. The ability of tool steel to resist softening at high temperatures is termed as __________________ hardness?
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A. Red

B. Extended

C. Extreme

D. Super
651. _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700C ?
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A. Galvanising

B. Calorising

C. Electroplating

D. Veneering

652. Plants produce carbohydrates from the CO2 present in the atmosphere by_________________?
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A. Photochemical reaction

B. Oxidation

C. Polymerisation

D. None of these

653. Most important property of steels for use in automobile bodies is the___________________?
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A. Resilience

B. Yield strength

C. Toughness

D. Formability
654. Magnesium is present in___________________?
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A. None of these

B. Haemoglobin

C. Chlorophyll

D. Hypo solution

655. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?
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A. 2,550

B. 13,000

C. 7,000

D. 9,100
656. Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part ?
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A. Annealing

B. Tempering

C. Anodising

D. Carburising

657. Air-petrol ratio in an automotive petrol engine is around ________________?
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A. 22:01

B. 14 : 1

C. 25:01:00

D. 4:01

658. The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the________________________?
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A. Ductility

B. Impact strength

C. Resilience

D. Toughness

659. Pick out the correct statement about the condensation?
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A. Suitable coating or vapour additive is used to promote film wise condensation

B. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation

C. ce on it

D. If a condensing liquid does not wet the surface dropwise, even then condensation will take

E. Reynolds number of condensing liquid is based on its mass flow rate

660. Which of the following properties of a solid is not dependent on crystal imperfection ?
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A. Semi-conductivity

B. Yield stress

C. Melting point

D. Ductility