chemical engineering Mcqs
501. Pick out the wrong statement ?
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A. High residual stress at the surface is beneficial for fatigue properties of a material

B. Phosphorous can be easily recovered in the iron blast furnace

C. Cold cracking of a weld is due to the presence of hydrogen gas in the weld

D. True stress is given by, ? = ?E (1 + ?E), where ?E and ?E are engineering stress and

E. ineering strain respectively

502. Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
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A. Limestone

B. Coke

C. Iron ore

D. Sinter

503. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?
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A. 100% direct reduction

B. 30-40% indirect reduction

C. 50-60% indirect reduction

D. 100% indirect reduction

504. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?
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A. 90 & 10

B. 70 & 30

C. 50 & 50

D. 30 & 70

505. During sensible heating of humid air__________________?
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A. Relative humidity increases

B. Dew point remains constant

C. Dry bulb & wet bulb temperature increases

D. Both B & C
506. Coating provided on the electrodes used in the arc welding is not expected to_________________?
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A. Add alloying elements

B. Provide protective atmosphere to weld

C. Prevent electrode from contamination

D. Stabilise the arc

507. Satellite is a _________________ material?
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A. Ferrous

B. Non-ferrous cast alloy cutting tool

C. Cemented carbide

D. Ceramic

508. Electrostatic separation of minerals from each other is based on their differences in the following property ?
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A. Hardness

B. Electrical conductivities

C. Densities

D. Magnetic permeabilities

509. Which of the following properties of a solid is not dependent on crystal imperfection ?
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A. Melting point

B. Yield stress

C. Semi-conductivity

D. Ductility

510. A metal having a Poissons ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is________________?
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A. 0.08

B. -0.24

C. -0.8

D. 0.8

511. Pick out the wrong statement ?
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A. erials

B. rcive forces

C. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic

D. A ferromagnetic material becomes paramagnetic above the Curie temperature

E. Tungsten steel and alnico are not hard magnetic materials

F. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and

512. Which of the following are considered applications of ultrasonic testing ?
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A. Measurement of material thickness

B. None of the above

C. Detection of defects in metal

D. Determination of elastic constant

513. Out of the following, the most malleable material is________________?
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A. Wrought iron

B. Copper

C. Lead

D. Aluminium

514. The transition temperature for ductile to brittle behavior of steel increases with increase in the _____________ content in steel?
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A. Carbon

B. Manganese

C. Both A nor B

D. Neither A nor B

515. Lead pencil contains____________________?
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A. Graphite

B. Lead sulphide

C. Lead

D. Both B. & C.

516. Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V b) = RT, depends upon its___________________?
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A. Pressure & specific volume

B. Temperature & specific volume

C. Temperature only

D. Pressure & temperature
517. Pick out the correct statement ?
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A. ocrystalline materials due to the presence of grains of different orientations

B. The damping capacity of a material is due to its plastic deformation

C. The elastic behaviour of rubber under compression is the same as its behaviour under tension

D. Materials exhibiting high elasticity obey Hookes law

E. The stress required to cause plastic flow in polycrystalline material is higher as compared to

518. Iron content in Indian iron ore is about _________________ percent?
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A. 40-45

B. 80-85

C. 20-25

D. 60-65
519. Insulation of liquid surface can be achieved by _____________ on top of its surface?
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A. Putting cement

B. None of these

C. Spraying alumina powder

D. Floating hollow polypropylene spheres
520. If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ?
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A. Temperature

B. Enthalpy

C. Internal energy

D. Entropy
521. Strain hardening effect in a metal subjected to cold working is due to the ______________ mechanism?
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A. Twinning

B. Slip

C. Fracture

D. Dislocation

522. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?
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A. Humidity is < 100% & dew point temperature of air has not reached

B. Air is fully saturated

C. Dew point temperature of air has not reached & air is not saturated fully

D. Partial pressure of water vapour is less than the total pressure

523. The trace metal present in insulin is____________________?
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A. Ni

B. Zn

C. Cu

D. Fe

524. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?
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A. 75

B. 25

C. 55

D. 35

525. _________________ furnace is generally used in the non-ferrous foundries ?
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A. Induction

B. Resistance

C. Direct arc

D. Indirect arc
526. Lead is poured into the joint between two ______________ pipes?
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A. Asbestos cement

B. Mild steel

C. Cast iron

D. Concrete

527. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________?
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A. Platinum

B. Vanadium

C. Nickel

D. Cobalt

528. Methyl orange indicator turns_____________________?
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A. Orange yellow in alkaline medium

B. Orange yellow in acidic medium

C. Colourless in basic medium

D. Colourless in acidic medium

529. _______________ is a non volatile film forming constituent of a paint ?
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A. None of these

B. Dryer

C. Drying oil

D. Thinner

530. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?
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A. 9:01

B. 17 : 1

C. 23:01

D. 29:01:00

531. For dynamic strain measurement, the Wheatstone bridge used is of ______________ type ?
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A. Current sensitive deflected

B. None of these

C. Voltage sensitive null

D. Voltage sensitive deflected
532. The swift cup test evaluates the following property of a sheet metal ?
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A. Bendability

B. Stretchability

C. None of these

D. Drawability
533. Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ?
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A. Nucleons

B. Electrons

C. Neutrons

D. Atoms
534. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
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A. +4000

B. -4000

C. -10000

D. 10000

535. Softening of hardened steel is done by its____________________?
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A. Annealing

B. Tempering

C. Carburising

D. Normalising
536. Joule-Thomson co-efficient is the ratio of________________?
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A. Temperature change to pressure change occuring during adiabatic throttling of a gas

B. Pressure change to temperature change occuring during adiabatic compression of a gas

C. Temperature change to pressure change occuring during adiabatic compression of a gas

D. Pressure change to temperature change occuring during adiabatic throttling of a gas

537. The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6) ?
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A. 5.6

B. 4.4

C. 2.4

D. 8.4

538. Hot extrusion of aluminium is done in the temperature range of ________________ C ?
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A. 550-600

B. 450-500

C. 250-300

D. 350-400
539. Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?
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A. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld

B. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

C. Segregation of carbon and other element occurs in the weld pool leading to poor properties of

D. Carbon and other alloying elements get oxidised from the weld pool

E. weld

540. Constituents of stellite are ____________________?
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A. Cobalt, chromium & tungsten

B. Zinc, aluminium & nickel

C. Zinc, copper & nickel

D. Nickel, cobalt & vanadium

541. Multistage compression of air as compared to single stage compression offers the advantage of______________?
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A. Moisture elimination in the inter-stage cooler

B. All A , B. & C.

C. Power saving per unit weight of air delivered

D. Increased volumetric efficiency

542. Globular form of cementite is formed during the _________________ process ?
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A. Spheroidising

B. Normalising

C. Hardening

D. Annealing

543. Pick out the correct statement?
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A. Hot worked materials are subjected to annealing to remove internal stresses

B. Annealing of steel hardens it slightly

C. Normalising of a material induces stresses

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
544. If Reynolds number is greater than 1, then the_____________________?
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A. Inertia force is larger than the viscous force

B. Inertia force is larger than the surface tension force

C. Inertia force is larger than the gravitational force

D. Viscous force is larger than the inertia force

545. Otto cycle used in spark ignition petrol engines is also known as the constant ________________ cycle?
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A. Heat

B. Pressure

C. Volume

D. None of these

546. Probability of cavitation occuring becomes very high, when the local _______________ resulting ?
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A. Pressure falls below the vapour pressure

B. water bubbles formation, which on rupture cause cavitation

C. All A, B & C

D. Pressure becomes very high

E. Temperature becomes low

547. High endurance limit of carburised machine parts is because of the fact that carburisation __________________?
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A. Introduces a compressive layer on the surface

B. Produces a better surface finish

C. Enhances the yield point of the material

D. Suppresses any stress concentration produced in the parts

548. Pick out the wrong statement ?
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A. Both annealing and normalising release the internal stresses of the material besides improving

B. mechanical properties

C. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it

D. subjected to case hardening or surface hardening processes like cyaniding, carburising,

E. riding etc., which produces high carbon outer layers resulting in increase of surface

F. dness

549. Identify the correct statement?
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A. Sphlerite is zinc oxide

B. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

C. The first law of the thermodynamics is stated as ?E = ?Q ?W

D. Lead can be produced in a blast furnace
550. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
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A. Lower, as it gives shorter wavelength

B. Higher, as it gives shorter wavelength

C. Lower, as it gives higher wavelength

D. Higher, as it gives higher wavelength