chemical engineering MCQs – Page 27

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 Review each marked answer and report any item that may be outdated or unclear.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
521. Strain hardening effect in a metal subjected to cold working is due to the ______________ mechanism?
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A. Twinning

B. Slip

C. Fracture

D. Dislocation

522. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?
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A. Humidity is < 100% & dew point temperature of air has not reached

B. Air is fully saturated

C. Dew point temperature of air has not reached & air is not saturated fully

D. Partial pressure of water vapour is less than the total pressure

523. The trace metal present in insulin is____________________?
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A. Ni

B. Zn

C. Cu

D. Fe

524. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?
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A. 75

B. 25

C. 55

D. 35

525. _________________ furnace is generally used in the non-ferrous foundries ?
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A. Induction

B. Resistance

C. Direct arc

D. Indirect arc
526. Lead is poured into the joint between two ______________ pipes?
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A. Asbestos cement

B. Mild steel

C. Cast iron

D. Concrete

527. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________?
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A. Platinum

B. Vanadium

C. Nickel

D. Cobalt

528. Methyl orange indicator turns_____________________?
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A. Orange yellow in alkaline medium

B. Orange yellow in acidic medium

C. Colourless in basic medium

D. Colourless in acidic medium

529. _______________ is a non volatile film forming constituent of a paint ?
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A. None of these

B. Dryer

C. Drying oil

D. Thinner

530. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?
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A. 9:01

B. 17 : 1

C. 23:01

D. 29:01:00

531. For dynamic strain measurement, the Wheatstone bridge used is of ______________ type ?
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A. Current sensitive deflected

B. None of these

C. Voltage sensitive null

D. Voltage sensitive deflected
532. The swift cup test evaluates the following property of a sheet metal ?
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A. Bendability

B. Stretchability

C. None of these

D. Drawability
533. Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ?
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A. Nucleons

B. Electrons

C. Neutrons

D. Atoms
534. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
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A. +4000

B. -4000

C. -10000

D. 10000

535. Softening of hardened steel is done by its____________________?
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A. Annealing

B. Tempering

C. Carburising

D. Normalising
536. Joule-Thomson co-efficient is the ratio of________________?
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A. Temperature change to pressure change occuring during adiabatic throttling of a gas

B. Pressure change to temperature change occuring during adiabatic compression of a gas

C. Temperature change to pressure change occuring during adiabatic compression of a gas

D. Pressure change to temperature change occuring during adiabatic throttling of a gas

537. 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. 5.6

B. 4.4

C. 2.4

D. 8.4

538. Hot extrusion of aluminium is done in the temperature range of ________________ C ?
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A. 550-600

B. 450-500

C. 250-300

D. 350-400
539. Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?
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A. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld

B. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

C. Segregation of carbon and other element occurs in the weld pool leading to poor properties of

D. Carbon and other alloying elements get oxidised from the weld pool

E. weld

540. Constituents of stellite are ____________________?
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A. Cobalt, chromium & tungsten

B. Zinc, aluminium & nickel

C. Zinc, copper & nickel

D. Nickel, cobalt & vanadium