chemical engineering MCQs – Page 376

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 Review each marked answer and report any item that may be outdated or unclear.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
7501. Pulverised fuel fired furnaces employ ______________ fuel firing?
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A. Horizontal

B. Vertical

C. All A., B. and C.

D. Tangential

7502. Pick out the wrong statement?
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A. Bronze is an alloy of copper & tin

B. The alloy named German silver does not contain any silver

C. Brass is an alloy of copper & zinc

D. The ability of a material to fracture without appreciable deformation is called its ductility
7503. Ceramic materials__________________?
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A. Are exemplified by clay and mica

B. Never exhibit polymorphism

C. Are poor electrical conductors due to lack of free electrons

D. All A., B. and C.
7504. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100C ?
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A. Monel

B. Graphite

C. Stainless steel

D. Kel-F and Teflon

7505. Advantages of use of preheated combustion air are__________________?
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A. Increase in flame temperature

B. All A., B. and C.

C. Reduction in scale losses

D. Saving in fuel consumption

7506. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ C?
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A. 650

B. 1000

C. 250

D. 850

7507. An elastic behaviour of materials is expressed in terms of_______________?
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A. None of these

B. Hysteresis loop area

C. Relaxation time

D. Stress-strain curve

7508. Kel-F is a material, which is________________?
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A. Having excellent chemical & high temperature resistance (upto 200C)

B. All A., B. and C.

C. Chemically known as Polychlorotrifluoroethylene (PTFE)

D. Having elastomeric properties

7509. Which of the following is a batch furnace ?
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A. Cupola

B. Reheating furnace

C. None of these

D. Glass tank furnace

7510. The addition of antimony in tin-based alloys improves its________________?
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A. Deformation resistance

B. Impact strength and bonding strength

C. Rupture strength and hot hardness

D. Wear resistance

7511. Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?
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A. kcal/m3 combustion space

B. None of these

C. kcal/hr/m3 combustion space

D. kcal/hr

7512. An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?
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A. Shaft

B. Tunnel

C. Rotary hearth

D. Walking beam
7513. Pick out the wrong statement?
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A. The point at which the resultant pressure on an immersed surface acts, is known as the centre

B. The vacuum pressure is always the negative gauge pressure

C. The pressure of the liquid measured by a piezometer tube is the gauge pressure

D. gravity</strong>

E. Manometric liquid should have high surface tension

7514. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
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A. All A., B. and C.

B. Nature of process; whether batch, continuous or intermittent

C. Thermal conductivity of the charge & structural materials of furnace

D. Rate of firing and emissivity of flame

7515. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200C ?
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A. 5

B. 20

C. 60

D. 40

7516. Pick out the wrong statement?
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A. Graphite refractories are also called plumbago refractories

B. Calcined magnesite is also called dead burnt magnesite

C. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28

D. Insulating refractories used in place of regular refractory bricks are usually called light weight

E. ractories, and they have similar composition as heavy bricks

7517. Regenerators are used for waste heat recovery in____________________?
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A. By-product coke ovens

B. Blast furnace stoves

C. Soaking pits

D. Beehive coke oven

7518. Ammonium phosphate is a _____________ fertiliser?
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A. Nitrogenous

B. Mixed

C. Phosphatic

D. Complex

7519. Fresh sewage is ______________ in nature?
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A. Highly acidic

B. Acidic

C. Neutral

D. Alkaline
7520. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
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A. 50

B. 5000

C. 500

D. 5