chemical engineering MCQs – Page 365

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 Review each marked answer and report any item that may be outdated or unclear.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

7281. Pick out the correct statement pertaining to Venturimeter ?
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A. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when

B. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically

C. nward, than when the flow is vertically upward

D. The co-efficient of contraction of a Venturimeter is always unity

E. None of these

F. pressibility is taken into account, than when it is neglected

7282. Which is not a hearth furnace ?
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A. Open hearth furnace

B. Cupola

C. Reheating furnace

D. Glass tank furnace

7283. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
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A. Increase in flame temperature

B. Increase in calorific value of the fuel

C. Reduction in scale losses

D. Saving in fuel consumption

7284. Reheating furnace (pusher type) is used for heating_____________________?
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A. Slabs

B. Steel sheets

C. Steel coils

D. Ingots

7285. Refined acetic acid storage vessel are made of___________________?
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A. High carbon steel

B. Aluminium

C. Copper

D. Nickel

7286. Size of the combustion chamber of a furnace depends upon the ___________________?
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A. Heat release rate of the fuel

B. Preheat temperature of fuel & air

C. All A., B. and C.

D. Method of mixing the fuel & air

7287. Combustion of fuel in a furnace with oxygen enriched air results in higher__________________?
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A. Stack loss

B. Fuel consumption

C. Flue gas volume

D. Flame temperature

7288. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ C?
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A. 80

B. 250

C. 130

D. 180

7289. Ceramic recuperators compared to metallic recuperators for the same duty_________________?
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A. Occupy more space

B. Are less costly

C. Have higher pressure differential between flue gas & air side

D. Are lighter

7290. DDT is shipped in_________________?
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A. Stainless steel containers

B. Paper bags

C. Fibre drums

D. Either B. or C.

7291. In reverberatory furnace, charge is heated mainly by__________________?
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A. Radiation of heat from the roof of the combustion chamber

B. Conduction

C. None of these

D. Natural convection

7292. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is ______________________?
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A. Not helpful in producing cleaner steel due to oxidising action of vanadium

B. Having poor toughness

C. Having poor fatigue resistance

D. Used for making axle & shafts of aeroplanes, automobiles and locomotives

7293. Corrosion resistance of steel is increased by the addition of_________________?
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A. Nickel and chromium

B. Lead and vanadium

C. Molybdenum and tungsten

D. Phosphorous and tungsten

7294. _____________ atmosphere is maintained inside an iron blast furnace?
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A. Decarburising

B. Inert

C. Reducing

D. Oxidising

7295. Mercury is transported in metal containers made of________________?
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A. Aluminium

B. Iron

C. Nickel

D. Lead

7296. Fuel economy in furnaces can be achieved by_________________?
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A. Preheating the combustion air

B. Reducing the heat loss through furnace openings & doors

C. All A., B. and C.

D. Using oxygen enriched combustion air

7297. Pick out the wrong statement?
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A. perature

B. The temperature at which new grains are formed in a metal is known as the recrystallisation

C. The toughness of a material decreases, when it is heated

D. Crane hooks are normally made of wrought iron

E. Cold working of a metal decreases its fatigue strength

7298. In furnaces operating at very high temperature (say) 1250C, e.g. soaking pit), the maximum heat transfer takes place by__________________?
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A. Convection

B. Cannot be predicted

C. Radiation

D. Conduction

7299. Pick out the wrong statement about cavitation?
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A. ulting in audible noise

B. Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in

C. Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines

D. mation & collapse of vapor cavities

E. Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation

F. des</strong>

7300. Cast irons are generally specified by their_________________?
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A. Hardness

B. Manufacturing process

C. Tensile strength

D. Carbon content

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