chemical engineering MCQs – Page 35

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 Review each marked answer and report any item that may be outdated or unclear.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
681. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?
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A. 1/k

B. k

C. 1/k2

D. k2

682. In the diving apparatus, helium is used along with oxygen, because it is ____________________?
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A. Not soluble in blood at high pressure

B. Easily available

C. Completely miscible with oxygen

D. Lighter than nitrogen

683. Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?
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A. SiO2

B. MnO2

C. Al2O3

D. P

684. Temperature attained in soldering of metals is about ________________ C?
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A. 1000-1100

B. 150-300

C. 650-800

D. 400-500

685. Austempering of steel requires it to be heated to 875C followed by sudden cooling to 250- 525C, thereby changing austenite to___________________?
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A. Bainite

B. Troostite

C. Martensite

D. Sorbite

686. Pearlite comprises of__________________?
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A. 87% ferrite & 13% cementite

B. 87% cementite & 13% Fe

C. 93.33% ferrite & 6.67% C

D. 87% ferrite & 13% C

687. Most of the phosphorous present in the blast furnace burden enters into___________________?
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A. Flue gases

B. Refractory lining

C. Hot metal

D. Slag

688. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
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A. Propane and LPG

B. Propane and acetylene

C. B.F gas and coke oven gas

D. Sewage gas and gobar gas

689. Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam will be_________________?
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A. Wet

B. Superheated

C. Saturated

D. None of these

690. _________________ is not used as a material of construction in thermocouples ?
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A. Alumel

B. Duralumin

C. Rhodium

D. Constantan

691. In a totally irreversible isothermal expansion process for an ideal gas, ?E = 0, ?H = 0. Then ?Q and ?S will be_______________?
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A. ?Q = 0, ?S=0

B. ?Q = +ve, ?S= +ve

C. ?Q = 0, ?S = +ve

D. ?Q = 0, ?S = -ve

692. In electrical resistance welding, distortion results from the use of improper________________?
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A. Clamping methods

B. Filler material

C. Electrodes

D. Current

693. Addition of ____________________ to steel does not help in improving its machinability?
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A. Silicon

B. Sulphur

C. Phosphorous

D. Lead

694. _____________________ of austenite decreases the hardenability in steel ?
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A. Fine grains

B. Homogeneity

C. Dissolved elements (except cobalt)

D. Coarse grains

695. The main constituent of bones is ______________________?
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A. CaCl2

B. CaCO3

C. Ca3(PO4)2

D. CaF2

696. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system_________________?
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A. Has very high C.O.P.

B. Is as light as possible

C. Employs minimum quantity of refrigerant

D. Consumer minimum horse power

697. A fire tube boiler is limited to a maximum steam pressure of about ______________ kg/cm2 ?
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A. 6

B. 52

C. 38

D. 18
698. Sand used to stop the green sand from sticking to the pattern is termed as the ______________ sand?
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A. Synthetic

B. Loam

C. Dry

D. Parting
699. ________________ is the hardest material out of the following ?
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A. Boron carbide

B. Silicon carbide

C. Tungsten carbide

D. Hardened steel

700. Encyclopaedia of Chemical Technology has been ____________________?
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A. Edited by Perry and Chilton

B. Authored by Kirk Othmer

C. Edited by Kirk Othmer

D. Authored by Perry and Chilton