chemical engineering chemical engineering basics MCQs – Page 29

Practise multiple-choice questions from chemical engineering chemical engineering basics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
561. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and ___________________?
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A. Manganese

B. Nickel

C. Chromium

D. Silicon

562. Flare tower used in industry is meant for_____________________?
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A. None of these

B. Absorbing the pollutant gases from the furnace exhaust

C. Cooling of furnace exhaust gases

D. Venting off (after burning) the excess inflammable/toxic gases at high pressure
563. Out of the following, the most malleable material is________________?
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A. Lead

B. Copper

C. Wrought iron

D. Aluminium

564. Electrometallurgy is not involved in the extraction of ___________________ from its ore?
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A. Aluminium

B. Tin

C. Lead

D. Both B. & C.
565. Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?
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A. P

B. SiO2

C. Al2O3

D. MnO2

566. Cold chisel?s hammers are made of___________________?
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A. Forged steel

B. High carbon steel

C. Mild steel

D. High speed steel

567. _______________ is the most important element, which controls the physical properties of steel ?
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A. Vanadium

B. Manganese

C. Carbon

D. Silicon

568. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the_______________?
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A. Bauschinger effect

B. Stress recovery effect

C. Creeping effect

D. Work hardening

569. The activity co-efficient of the solute in a dilute solution ?
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A. Remains constant

B. Decreases with the increase of concentration of the solute

C. Is unity at infinite dilution

D. Increases with the increase of concentration of the solute

570. Increasing the carbon content of steel_________________?
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A. Reduces the upper shelf energy

B. Decreases hardness

C. Decreases brittleness

D. Increasing the ductility transition temperature
571. Unbreakable crockeries are made from ______________ polymers?
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A. Melamine

B. Polyurethane

C. Polystyrene

D. Polystyrene

572. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by_________________?
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A. T1/(T1-T2)

B. T2/(T1-T2)

C. T1/T2

D. T2/T1

573. Work study deals with the _______________ study?
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A. Time

B. Motion

C. Both A. & B.

D. Neither A. nor B.

574. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in _______________ electrons ?
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A. None of these

B. Lack of free

C. Decrease in

D. Excess of
575. In ________________ process, there is an increase in entropy with no degradation of energy ?
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A. Isochoric heat addition

B. Isothermal expansion

C. Isobaric heat addition

D. Polytropic expansion

576. Air standard Otto cycle is more efficient than the diesel cycle for the same__________________?
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A. Compression ratio & pressure

B. Heat addition & compression ratio

C. Cylinder dimension & rpm

D. Heat addition & pressure

577. Most of the phosphorous present in the blast furnace burden enters into___________________?
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A. Flue gases

B. Slag

C. Hot metal

D. Refractory lining

578. ______________ wire is never used for making the heating element ?
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A. Invar

B. Nichrome

C. None of these

D. Kanthal

579. A thin, flat & square plate measuring 2 m 2 m is freely hanging in ambient air at 25C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30C, if the convective heat transfer co-efficient is ________________ W/m2 C ?
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A. 100

B. 150

C. 200

D. 50

580. Out of the following the refractive index is the highest for____________________?
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A. Diamond

B. Kerosene

C. Brine

D. Glass