chemical engineering MCQs – Page 367

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 Review each marked answer and report any item that may be outdated or unclear.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
7321. Pick out the correct statement pertaining to the flow through a converging-diverging tube ?
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A. None of these

B. Throughout the converging portion of the tube, the density increases in the downstream

C. No shock wave develops in the tube when the Mach number at exit is greater than unity

D. ection

E. The value of Mach number is always unity at the throat

7322. Pick out the wrong statement?
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A. Spheroidal grey cast iron contains graphite flakes

B. Wrought iron cannot be easily forged and welded

C. Wrought iron contains about 0.02% carbon

D. The chilled cast iron does not contain graphite

7323. Cast iron has____________________?
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A. Its elastic limit very close to ultimate breaking strength

B. High ductility

C. Very high tensile strength

D. High malleability

7324. Which of the following stainless steels is non-magnetic ?
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A. Martenistic

B. None of these

C. Ferritic

D. Austenitic
7325. Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?
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A. orientation of Venturimeter

B. Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of

C. Venturimeter incurs less power loss compared to an equivalent orificemeter

D. For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that

E. Venturimeter occupies less space than an orificemeter

F. ving the Venturimeter

7326. Decarburisation of steel__________________?
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A. All A., B. and C.

B. Is the removal of carbon from iron carbide (Fe3C)

C. Affects its crystalline structure

D. Is favoured by CO2

7327. While the fuel fired furnace can be used upto a maximum temperature of about 1700C, the electric furnace can be used upto a temperature of about _____________ C?
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A. 2000

B. 3000

C. 6000

D. 4500
7328. Which one shows the diagrammatic heat balance in a furnace ?
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A. Ostwald chart

B. Cox chart

C. Sankey diagram

D. None of these

7329. Which of the following is not a directly fired furnace ?
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A. Calcination kiln

B. Sintering furnace

C. Open hearth furnace

D. By-product coke oven
7330. Hypersil is a ______________ steel?
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A. Tungsten

B. High speed

C. Silicon

D. Molybdenum

7331. Cast iron has very high___________________?
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A. Compressive strength

B. Ductility

C. Resistance to brittleness

D. Shock resistance

7332. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an_________________?
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A. All A., B. and C.

B. Economiser

C. Steam superheater

D. Air preheater

7333. Which of the following is a heat treatment furnace ?
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A. Reheating furnace

B. Rotary kiln

C. Muffle furnace

D. Annealing furnace
7334. Reducing atmosphere is maintained in a__________________?
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A. Soaking pit

B. Calcination kiln

C. Blast furnace

D. L.D. converter

7335. In salt bath furnace, heat is transferred to the charge mainly by __________________?
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A. Radiation

B. None of these

C. Convection

D. Conduction
7336. Air filtration in a furnace___________________?
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A. None of these

B. Is indicated by flame sting out

C. Increases the flue gas temperature

D. Reduces its thermal efficiency
7337. Large tonnage of refractory bricks are dried in a_____________________?
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A. Shaft furnace

B. Muffle furnace

C. Tunnel kiln

D. Rotary hearth furnace

7338. The softest material just next to talc in the Mhos scale is_________________?
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A. Fluorite

B. Quartz

C. Gypsum

D. Feldspar

7339. Pick out the wrong statement?
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A. In the equation, T. gc = k. (du/dy)n the value of n for pseudoplastic and Dilatant fluid are 1 respectively

B. Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion

C. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

D. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ?p

7340. Which of the following is an alloy of nickel and copper ?
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A. Hastelloy

B. Duriron

C. Monel

D. Inconel