chemical engineering MCQs – Page 37

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 Review each marked answer and report any item that may be outdated or unclear.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

721. A thin, flat & square plate measuring 2 m 2 m is freely hanging in ambient air at 25C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30C, if the convective heat transfer co-efficient is ________________ W/m2 C ?
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A. 200

B. 100

C. 150

D. 50

722. Drossing is a _______________________ operation?
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A. Smelting

B. Dressing

C. Dressing

D. Roasting

723. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ?
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A. Air

B. Water

C. Mercury

D. Alcohol

724. Carbon supply in pack carburising process is in the form of ___________________?
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A. Graphite

B. Charcoal

C. Hydrocarbon oil

D. Calcium carbide

725. Out of the following the refractive index is the highest for____________________?
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A. Brine

B. Glass

C. Kerosene

D. Diamond

726. Cold working of a material results in increase in hardness, which is termed as the ______________ hardening ?
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A. Work

B. Cold

C. Induction

D. Age

727. Normalising of a casting does not__________________?
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A. Reduce segregation

B. Improve its mechanical properties

C. Refine its grain structure

D. Induce stresses in it

728. _________________ property of a material is determined by the Herbert Pendulum device?
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A. Compressive

B. Hardness

C. Tensile

D. Toughness

729. Pick out the wrong statement?
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A. Line organisation is net suitable for expansion and growth of an industry

B. None of these

C. Complete unity of command exists in a line organisation

D. In line and staff organisation, line executes and staff directs

730. Atomic _______________ is a whole number for an element?
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A. Number

B. Radius

C. None of these

D. Weight

731. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be _________________ toys ?
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A. 250

B. 3000

C. 1000

D. 500

732. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 10-16 m2S-1 and it is 1.94 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
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A. 250

B. 230

C. 180

D. 130

733. With decrease in the grain size of a material, its creep resistance___________________?
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A. Increases

B. Remain constant

C. Either A. or B.; depends on the material

D. Decreases

734. Oxyacetylene reducing flame is used while carrying out welding on__________________?
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A. High carbon steel

B. Mild steel

C. Grey cast iron

D. Alloy steel

735. When an isolated thermodynamic system executes a process ___________________?
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A. Work is done

B. Mass flow occurs across the boundary of the system

C. Heat transfer takes place

D. No chemical reaction takes place within the system

736. LVDT used for displacement measurement is a/an _______________ Transducer?
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A. Capacitive

B. None of these

C. Active

D. Passive

737. Which of the following is not a ferromagnetic material ?
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A. Nickel

B. Iron

C. Cobalt

D. Aluminium

738. Dew point temperature always gives an indication of the __________________ of the moist air ?
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A. Dryness

B. Moisture content

C. Latent heat

D. Coolness

739. The normal stress is the same in all directions at a point in a fluid, only when the fluid__________________?
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A. Fluid layer has no motion relative to an adjacent layer of fluid

B. is incompressible & frictionless

C. Is frictionless

D. Is at rest & has zero viscosity

740. Isotropic materials have the same _______________________ in all directions?
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A. Thermal properties

B. Elastic properties

C. Density

D. Induced stresses

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