chemical engineering Mcqs
7251. Carbon is present in the uncombined (graphitic) form in case of__________________?
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A. Ferroalloy

B. Cast iron

C. None of these

D. Steel

7252. Cast iron and steel pipes are produced by ____________ casting?
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A. Slush

B. Die

C. True centrifugal

D. Investment

7253. Pick out the wrong statement?
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A. Metal/alloys having hexagonal crystal lattice structure are less malleable than those having

B. ic crystal lattice structure

C. Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile

D. n those having face centred cubic (fcc) crystal lattice structure

E. Tungsten has a body centred cubic (bcc) crystal lattice structure

F. Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

7254. Which has the maximum melting point out of the following ?
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A. Stainless steel

B. Steel

C. Wrought iron

D. Cast iron

7255. The ability of a material to absorb energy in the elastic range is a measure of its __________________?
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A. Brittleness

B. Resilience

C. Malleability

D. Toughness

7256. Hammers and railway rails are normally made of___________________?
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A. Mild steel

B. Dead mild steel

C. Medium carbon steel

D. High carbon steel
7257. Carbon tetrachloride can be stored in a storage vessel made of________________?
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A. All A., B. and C.

B. Tin

C. High silicon iron (14% Si)

D. Stainless steel

7258. Graphite is corroded by_________________?
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A. None of these

B. Hydrochloric acid

C. Sulphuric acid (10%)

D. Sea water

7259. Which of the following has the highest density and the lowest melting point ?
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A. Titanium

B. Stainless steel

C. Aluminium

D. Lead
7260. Carbon content in plain carbon steel is ______________ percent?
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A. 0.65 to 0.80

B. 0.35 to 0.45

C. 0.1 to 0.15

D. 0.85 to 1.2

7261. Molten phthalic anhydride is stored in a/an _______________ vessel?
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A. Lead lined steel

B. Glass lined steel

C. Nickel clad steel

D. Aluminium
7262. Hardened steel is softened by___________________?
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A. Normalising

B. Annealing

C. Tempering

D. Carburising

7263. Hydrochloric acid is stored in a _____________ steel vessel?
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A. Rubber lined

B. Lead lined

C. Glass lined

D. Stainless

7264. Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
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A. Molybdenum steel

B. Cobalt steel

C. Nickel-chrome steel

D. Tungsten steel

7265. SO3 is absorbed using H2SO4 in a____________________?
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A. None of these

B. Stainless steel plate tower

C. Packed steel tower lined with acid proof bricks

D. Cast iron packed tower

7266. Approximate value of the modulus of elasticity for steel is about _____________ 106kg/cm2?
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A. 2

B. 0.5

C. 40

D. 75

7267. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
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A. Cox chart

B. Sankey diagram

C. None of these

D. Ostwald chart

7268. Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
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A. Size of the furnace

B. Emissivity of the refractory walls

C. Thickness of the stock

D. Use of waste heat recovery equipments
7269. In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
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A. More of CO2 in flue gas

B. More of CO in flue gas

C. More of excess air

D. Less of excess air

7270. Use of pulverised coal in boilers provides____________________?
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A. Higher calorific value

B. Better combustion

C. Less erosion on furnace wall

D. Smokeless burning

7271. The reason for excessive clinker formation in gas producers is the_____________________?
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A. Use of fuel having too low an ash fusion temperature

B. Development of hot spots in the fuel bed and an abnormally high rate of gasification

C. Use of coal/coke containing a high % of fines and ash

D. All A., B. and C.
7272. Pick out the wrong statement?
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A. Carbon refractories cannot be used in the furnaces operating under reducing conditions

B. Sand & coke is the main raw material for the manufacture of silicon carbide

C. Silica occurs in nature in all cellular, amorphous or crystalline form

D. Mullite can be obtained by the heating of alusite, kyanite or sillimanite

7273. Copper has very low________________?
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A. Tensile strength

B. Thermal & electrical conductivity

C. Malleability

D. Ductility

7274. In low or standard frequency induction furnace, heat is produced by the_______________________?
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A. Current flow through a heating element

B. Induction and resistance

C. None of these

D. Combination of induced current and skin effect

7275. All materials obey Hookes law within elastic limit. When elastic limit is reached, the tensile strain__________________?
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A. Decreases in proportion to stress

B. Decreases very quickly

C. Increases in proportion to stress

D. Increases very quickly
7276. _____________ furnace is not an electric furnace?
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A. Induction

B. Arc

C. Resistance

D. Pot
7277. Protective gas used in the annealing furnace for steel coil comprises of__________________?
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A. 100% CO

B. 5% H2 + 9% N2

C. 95% N2 + 5% H2

D. 100% H2

7278. The hardest material just prior to diamond in Mhos scale is___________________?
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A. Calcite

B. Corundum

C. Topaz

D. Carborundum

7279. The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?
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A. Accelerates the burning rate and economises on fuel consumption

B. All A., B. and C.

C. Permits the use of high ash content coal

D. Permits the use of low fusion point ash coal

7280. Presence of silicon in steel_____________________?
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A. Indicates that steel is not deoxidised properly

B. None of these

C. Decreases the blow holes formation tendency in castings

D. Is in the form of free Si

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