chemical engineering Mcqs
651. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is___________________?
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A. Same

B. Much more

C. Slightly more

D. Slightly less

652. Which of the following gases cause global warming ?
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A. Carbon monoxide

B. Carbon dioxide

C. Nitrogen

D. Ozone

653. Which of the following is resistant to the action of both heat & chemicals ?
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A. Borosilicate glass

B. Silica glass

C. None of these

D. Soda lime glass

654. Hardening of steel is not possible, unless it is heated _________________ critical point ?
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A. Between the first & second

B. Above the highest

C. Above the lowest

D. Between the second & third

655. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?
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A. Hot starting

B. Vapour locking

C. All A, B & C

D. Spark plug fouling
656. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by_________________?
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A. Decreasing the surface area of the electrodes

B. Increasing the concentration of copper sulphate solution

C. Increasing the surface area of the electrodes

D. Increasing the concentration of zinc sulphate solution

657. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the _______________ allowance ?
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A. Pattern

B. Casting

C. Draft

D. Distortion

658. Which of the following mainly decides the current to be employed is arc welding ?
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A. Plate thickness

B. Welded portion length

C. Electrode size

D. Voltage across the arc

659. Spheroidising of a material is a/an ________________ process?
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A. Normalising

B. Hardening

C. Tempering

D. Annealing
660. Which one is neutral in character ?
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A. N2O

B. N2O4

C. N2O5

D. N2O3

661. A material is capable of resisting softening at high temperature, because of its property termed as____________________?
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A. Hot hardness

B. Creep

C. Fatigue

D. Hot temper

662. Dislocation cross-slip is difficult in those materials, which have___________________?
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A. Large number of slip systems

B. Low stacking fault energy

C. High work hardening rate

D. Coarse grain size

663. Transformer cores are normally made from ______________________?
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A. High purity iron

B. Al-Ni-Co alloy

C. Grain oriented Fe-Si alloy

D. Soft ferrites

664. _________________ can replace tungsten in high speed steel ?
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A. Molybdenum

B. Vanadium

C. Cobalt

D. Chromium

665. Pick out the wrong statement about the machinability of metals. Machinability of a metal ?
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A. Decreases with increase in hardness, in general

B. Decreases with increase in strain hardening tendencies

C. Decreases with increases in tensile strength & decrease in grain size

D. Depend on the composition, microstructure and physical & mechanical properties

666. The cathode in an electrochemical cell always carries____________________?
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A. Zero charge

B. Positive charge

C. Negative charge

D. Positive or negative charge depending upon the nature of the cell

667. Large scale fire on fuel gas line is normally extinguished by________________?
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A. Steam

B. Nitrogen

C. Water

D. Foam

668. During sensible cooling of air, its wet bulb temperature ?
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A. Decreases but dew point remains constant

B. Increases but dew point remains constant

C. Increases & the dew point decreases

D. Decreases & the dew point increases

669. Non-ferrous alloys used for making cutting tools need not have high__________________?
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A. Toughness

B. Red hardness

C. Cutting speed

D. Abrasion resistance

670. Consideration of the creep is the most important in case of the_____________________?
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A. Cycle chain

B. Flywheel of steam engine

C. Blades of gas turbine

D. Piston of an I. C. engine

671. Magnesium is present in___________________?
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A. Hypo solution

B. Chlorophyll

C. None of these

D. Haemoglobin

672. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27C with relative humidity ranging from _______________ percent ?
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A. 75 to 80

B. 15 to 25

C. 45 to 50

D. 5 to 10

673. Electrometallurgical methods of metal extraction is normally used for those metals___________________?
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A. Which stands higher in the electrochemical series of the metal

B. All A, B. & C.

C. Whose oxide/ore is not reduced by carbon

D. Which fall in the category of alkali & alkaline earth metals

674. Titanium is produced by ___________________ of Ti Cl4 ?
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A. Magnesium reduction

B. Thermal dissociation

C. Calcium reduction

D. Electrolytic reduction

675. L.D. (Linz-Donawitz) converter is used in the production of____________________?
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A. Aluminium

B. Copper

C. Zinc

D. Steel
676. The condition of diffraction from a crystal is given by______________?
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A. n? = d Sin ?

B. ? = d Sin 2?

C. ? = 2d Sin 2?

D. n? = 2d Sin ?
677. Thermal conductivity of a material does not depend upon its_____________________?
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A. Volume

B. Surface area

C. All A, C & C

D. Mass

678. Percentage of argon (by volume) in dry atmospheric air is about________________?
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A. 0.57

B. 0.3

C. 0.94

D. 0.09

679. Pick out the wrong statement ?
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A. Martenistic transformation never goes to completion (i.e., 100%) at room temperature

B. Magnetic permeability of the diamagnetic material is less than one

C. Invar is a magnetic alloy

D. Weldability of high carbon steel is poorer compared to low carbon steel

680. A compact estimate about the amount of materials handling between various work stations is obtained from the_____________________?
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A. Gantt chart

B. Travel chart

C. String diagram

D. Bin chart

681. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?
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A. 1/k

B. k

C. 1/k2

D. k2

682. In the diving apparatus, helium is used along with oxygen, because it is ____________________?
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A. Not soluble in blood at high pressure

B. Easily available

C. Completely miscible with oxygen

D. Lighter than nitrogen

683. Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?
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A. SiO2

B. MnO2

C. Al2O3

D. P

684. Temperature attained in soldering of metals is about ________________ C?
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A. 1000-1100

B. 150-300

C. 650-800

D. 400-500

685. Austempering of steel requires it to be heated to 875C followed by sudden cooling to 250- 525C, thereby changing austenite to___________________?
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A. Bainite

B. Troostite

C. Martensite

D. Sorbite

686. Pearlite comprises of__________________?
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A. 87% ferrite & 13% cementite

B. 87% cementite & 13% Fe

C. 93.33% ferrite & 6.67% C

D. 87% ferrite & 13% C

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

B. Refractory lining

C. Hot metal

D. Slag

688. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
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A. Propane and LPG

B. Propane and acetylene

C. B.F gas and coke oven gas

D. Sewage gas and gobar gas

689. Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam will be_________________?
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A. Wet

B. Superheated

C. Saturated

D. None of these

690. _________________ is not used as a material of construction in thermocouples ?
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A. Alumel

B. Duralumin

C. Rhodium

D. Constantan

691. In a totally irreversible isothermal expansion process for an ideal gas, ?E = 0, ?H = 0. Then ?Q and ?S will be_______________?
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A. ?Q = 0, ?S=0

B. ?Q = +ve, ?S= +ve

C. ?Q = 0, ?S = +ve

D. ?Q = 0, ?S = -ve

692. In electrical resistance welding, distortion results from the use of improper________________?
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A. Clamping methods

B. Filler material

C. Electrodes

D. Current

693. Addition of ____________________ to steel does not help in improving its machinability?
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A. Silicon

B. Sulphur

C. Phosphorous

D. Lead

694. _____________________ of austenite decreases the hardenability in steel ?
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A. Fine grains

B. Homogeneity

C. Dissolved elements (except cobalt)

D. Coarse grains

695. The main constituent of bones is ______________________?
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A. CaCl2

B. CaCO3

C. Ca3(PO4)2

D. CaF2

696. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system_________________?
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A. Has very high C.O.P.

B. Is as light as possible

C. Employs minimum quantity of refrigerant

D. Consumer minimum horse power

697. A fire tube boiler is limited to a maximum steam pressure of about ______________ kg/cm2 ?
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A. 6

B. 52

C. 38

D. 18
698. Sand used to stop the green sand from sticking to the pattern is termed as the ______________ sand?
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A. Synthetic

B. Loam

C. Dry

D. Parting
699. ________________ is the hardest material out of the following ?
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A. Boron carbide

B. Silicon carbide

C. Tungsten carbide

D. Hardened steel

700. Encyclopaedia of Chemical Technology has been ____________________?
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A. Edited by Perry and Chilton

B. Authored by Kirk Othmer

C. Edited by Kirk Othmer

D. Authored by Perry and Chilton