chemical engineering MCQs – Page 32

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 Review each marked answer and report any item that may be outdated or unclear.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

621. In a good rimming steel_________________________?
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A. Carbon and silicon should be low

B. Silicon should be low but carbon should be high

C. Both silicon & carbon should be high

D. Silicon should be high but carbon should be low

622. The most suitable material for die casting is __________________?
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A. Iron

B. Nickel

C. Steel

D. Copper

623. Pick out the correct statement about the condensation?
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A. Reynolds number of condensing liquid is based on its mass flow rate

B. Suitable coating or vapour additive is used to promote film wise condensation

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

D. ce on it

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

624. For an ideal gas, Cp Cv is____________________?
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A. 0

B. R

C. (3/2) R

D. -R

625. Which of the following material handling equipments is not suitable for moving materials in varying paths ?
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A. Crane

B. Truck

C. Hand trolley

D. Belt conveyor

626. The burnout heat flux in the nucleate boiling regime is not a function of the_________________?
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A. Liquid density

B. Temperature difference

C. Heat of evaporation

D. Vapour density

627. Cascade control is___________________?
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A. Useful to control flow from temperature

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. The continuous adjustment of the set point index of an automatic control loop by a primary(master) controller

D. All A, B & C

628. Which of the following alloying elements is present in maximum percentage in high speed steel ?
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A. Vanadium

B. Chromium

C. Molybdenum

D. Tungsten

629. _______________ is the most important element, which controls the physical properties of steel ?
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A. Silicon

B. Manganese

C. Vanadium

D. Carbon

630. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?
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A. 10

B. 20

C. 40

D. 30

631. Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
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A. Hastelloy

B. Invar

C. Monel metal

D. Duralumin

632. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?
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A. V2/A

B. V2/A2

C. V/A2

D. V/A

633. Consumable electrodes are used in the ____________________ welding?
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A. Resistance

B. Arc

C. Thermit

D. Gas

634. Main constituent of bone ash is____________________?
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A. Calcium phosphate

B. Animal charcoal

C. Ammonium phosphate

D. Ammonium sulphate

635. For grinding of softer materials, the grinding wheel should have _________________ grain size ?
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A. Coarser

B. Any type of

C. Medium

D. Finer

636. An oxidation process is accompanied with decrease in the____________________?
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A. Oxidation number

B. Number of ions

C. All A , B. & C.

D. Number of electrons

637. _____________ 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. Calorising

B. Veneering

C. Galvanising

D. Electroplating

638. The life of a ball bearing is inversely proportional to________________?
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A. (Load)0.33

B. (Load)1

C. (Load)3

D. (Load)2

639. At absolute zero temperature, for any reaction involving condensed phases ?
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A. ? S = 0 , ? Cp = 0

B. ? H = 0 , ? S = 0

C. ? G = 0 , ? H = 0

D. ? S = 0 , ? E = 0

640. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be_______________?
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A. Same

B. More

C. Either more or less; depends on the climatic conditions

D. Less

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