chemical engineering MCQs – Page 370

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 Review each marked answer and report any item that may be outdated or unclear.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

7381. Steel tower used for the storage of oleum________________?
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A. Is lined with rubber

B. Is lined with lead

C. Is lined with acid-proof bricks

D. Need not be lined

7382. In a muffle furnace, the muffle_________________?
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A. Permits the use of controlled atmosphere for the protection of stock

B. Retards the heat transfer

C. Assists in temperature equalisation in the charge

D. All A., B. and C.

7383. Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________?
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A. Annealing furnace

B. Blast furnace

C. Steam boiler

D. Salt bath furnace

7384. Which of the following variables does not affect the furnace capacity ?
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A. Gas velocity in furnace

B. Size of the furnace

C. None of these

D. Ratio of wall surface to surface of stock

7385. ______________ is never shipped in glass carboys?
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A. Phenol

B. Formaldehyde

C. Ammonia

D. Acetic acid

7386. Which of the following is the most suitable for preheating combustion air above 650C ?
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A. None of these

B. Regenerator

C. Ceramic recuperator

D. Metallic recuperator

7387. Pick out the correct statement?
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A. For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear

B. A Newtonian fluid obeys Newtons law of cooling

C. ess and shear gradient

D. Thin lubricating oil is an example of a non-Newtonian fluid

E. Human blood is a Newtonian fluid

7388. The amount of combustible escaping unconsumed from the furnace, depends upon the________________?
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A. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by

B. nge of direction)

C. Burner design (thoroughness of mixing versus stratification)

D. All A., B. and C.

E. Air supplied and furnace temperature

7389. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?
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A. Use of non-preheated combustion air

B. Use of pulverised solid fuels

C. Use of excessive positive draft in the furnace

D. Imperfect mixing of fuel & air and infiltration of air

7390. A refractory wall separating the stock and the source of heat is provided in a__________________?
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A. Muffle furnace

B. Updraft kiln

C. Continuous furnace

D. None of these

7391. Pick out the correct statement?
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A. Maximum work is done under reversible conditions

B. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

C. The internal energy of an ideal gas depends only on its pressure

D. Melting of ice involves increase in enthalpy and a decrease in randomness

7392. The main function of a muffle in the muffle furnace is to__________________?
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A. Protect the charge from the effects of the products of combustion

B. Smooth out temperature inequalities on the combustion side of the muffle wall

C. Both A. & B.

D. Neither A. nor B.

7393. Pick out the correct statement?
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A. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under

B. ditions of flow</strong>

C. Fanning friction factor is inversely proportional to Reynolds number always

D. ume to the volume of voids in the bed

E. Mach number in an incompressible fluid is always unity

F. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total

7394. Neutral atmosphere is maintained in a/an ____________ furnace?
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A. Soaking pit

B. Cold rolled steel coil annealing

C. Walking beam reheating

D. Open hearth

7395. The rate of scaling of furnace stock depends upon the_________________?
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A. Nature of atmosphere

B. Temperature

C. All A., B. and C.

D. Time

7396. Cementite is________________?
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A. A compound of carbon and iron

B. Characterised by an orthorhombic crystal structure

C. All A., B. and C.

D. Fe3C chemically

7397. An example of indirectly heated furnace is the_________________?
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A. Soaking pit

B. None of these

C. Reheating furnace

D. Muffle furnace

7398. Most suitable material of construction for the storage of concentrated nitric acid is__________________?
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A. Cast iron

B. Karbate

C. Monel

D. Aluminium or chromium alloys (Cr > 18% for cold acid)

7399. Which of the following is not a nickel based alloy ?
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A. Hastelloys

B. Babbitt metal

C. Inconel

D. Nimonics

7400. The fermenter used for the production of ethyl alcohol from molasses is made of________________?
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A. Wood

B. Copper bearing steel

C. Concrete

D. Porcelain

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