chemical engineering chemical engineering basics Mcqs
451. In case of simple harmonic motion, displacement is proportional to the_________________?
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A. Velocity

B. Acceleration

C. Both A. & B.

D. Neither A. nor B.

452. Alloy powder manufactured by the following process have spherical shapes ?
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A. Gaseous reduction

B. Electrochemical deposition

C. Atomisation

D. Mechanical attrition

453. Wrought iron does not have__________________?
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A. Easily weldable characteristics

B. Ability to hold protective coating

C. High ductility & corrosion resistance

D. Uniform strength in all directions
454. The mechanism involved in the removal of metal in drilling operation is by_________________?
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A. Compression

B. Extrusion

C. Shearing

D. Both B & C
455. A dense structure of grinding wheel is not used for the_____________________?
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A. Ductile material

B. Hard materials

C. Finishing cuts

D. Brittle materials

456. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ?
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A. Perspex

B. Lucite

C. Plexiglass

D. Styrofoam
457. Dielectric___________________?
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A. Should have high thermal conductivity

B. Need not defy the corrosive action of chemicals

C. Of low resistivity is preferred

D. Is an electrical insulating material
458. Which of the following is not an explosive ?
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A. TNT

B. Lead azide

C. RDX

D. CMC
459. One face of a furnace wall is at 1030C and the other face is exposed to room temperature (30C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is____________________?
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A. 100

B. 9000

C. 900

D. 10000
460. Dry saturated steam can be converted into super heated steam by____________________?
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A. Passing it through a pressure reducing valve

B. Increasing its cross-sectional area of flow

C. Forcing it downwards through a vertical tube

D. None of these

461. Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)________________?
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A. A

B. l

C. A2

D. Both A. & B.
462. Maximum permissible air velocity in pipelines is about ______________ metre/second ?
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A. 10

B. 20

C. 5

D. 40

463. Hot extrusion of aluminium is done in the temperature range of ________________ C ?
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A. 450-500

B. 350-400

C. 550-600

D. 250-300

464. The two elements required to form substitutional solid solution should not have___________________?
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A. Same valency

B. Same crystalline structure

C. Same atomic sizes

D. Widely differing electronegativity
465. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ______________ of the input signal?
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A. None of these

B. Frequency

C. Amplitude

D. Damping

466. Ultimate strength in tension as compared to that in shear for steel is____________________?
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A. One third

B. Half

C. One and half times

D. One fourth

467. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a _____________ reactor?
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A. Critical

B. Breeder

C. Fertile

D. Heterogeneous

468. Out of the following, the ________________ pipe has the least corrosion resistance?
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A. Mild steel

B. Cast iron

C. Copper

D. Wrought iron
469. 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

470. Thermal conductivity of a material does not depend upon its_____________________?
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A. Surface area

B. All A, C & C

C. Mass

D. Volume

471. Pick out the wrong statement about coating/electroplating of metals ?
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A. Phosphate coating is used as an excellent base for paints & enamels

B. Calorising is the process of coating steel with chromium

C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and

D. Phosphate coating is less corrosion resistant than chromate coating

E. ting metal is made the anode

472. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?
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A. 50-60% indirect reduction

B. 30-40% indirect reduction

C. 100% direct reduction

D. 100% indirect reduction

473. Pick out the correct statement?
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A. Normalising of a material induces stresses

B. Hot worked materials are subjected to annealing to remove internal stresses

C. Annealing of steel hardens it slightly

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
474. For the Stokes law to be valid in the case of a falling sphere in a fluid, the_____________________?
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A. Reynolds number (based on sphere diameter) should be < 1

B. Flow around the sphere should be in turbulent region

C. Fluid density should be constant

D. Sphere must be metallic
475. Identify the false statement?
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A. Pitting corrosion is usually very localised

B. Stress corrosion cracking is facilitated by tensile stress

C. Hydrogen embrittlement is facilitated by tensile stress

D. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
476. Pick out the wrong statement ?
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A. ding

B. te thickness to be welded)

C. Mild steel sheet cannot be spot welded

D. Seam welding, projection welding & spot welding are the classification of electrical resistance

E. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t =

F. In spot welding, two pieces to be joined are overlapped and placed between two electrodes

477. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ? = specific weight of the gas) ?
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A. 1/??

B. 1/?P

C. ?y

D. ?T

478. Multistage compression of air as compared to single stage compression offers the advantage of______________?
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A. Increased volumetric efficiency

B. Moisture elimination in the inter-stage cooler

C. All A , B. & C.

D. Power saving per unit weight of air delivered

479. Optical activity is a/an _______________________ property ?
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A. Additive

B. Constitutive

C. Both A. & B.

D. Neither A. nor B.

480. Coarse grained steels have____________________?
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A. Low toughness

B. Very high toughness

C. No tendency to distort

D. High density

481. The life of a ball bearing is inversely proportional to________________?
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A. (Load)3

B. (Load)0.33

C. (Load)2

D. (Load)1

482. Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
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A. Gaseous medium

B. Oxygen

C. Air

D. Liquid medium
483. Which of the following materials has the poorest electrical conductivity ?
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A. Aluminium

B. Silver

C. Carbon

D. Stainless steel

484. 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. Saturated

B. Wet

C. Superheated

D. None of these

485. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?
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A. Excess air has been used for combustion

B. Nitrogen percentage in the fuel is very high

C. Pure oxygen has been used for combustion

D. Hydrogen is not present in the fuel

486. Preheating before welding is done to____________________?
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A. Make the plate softer

B. Prevent cold cracks

C. Burn oil & grease sticking to plate surfaces

D. Avoid plate distortion

487. GASOHOL widely used in Brazil as a motor fuel is a mixture of alcohol and____________________?
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A. None of these

B. Petrol

C. Light hydrocarbon gases (e.g. butane or propane)

D. LPG

488. Methyl orange indicator turns_____________________?
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A. Orange yellow in acidic medium

B. Colourless in acidic medium

C. Orange yellow in alkaline medium

D. Colourless in basic medium

489. Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?
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A. weld

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

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

D. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld

E. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
490. Energy to be supplied to the radioactive nucleus for the emission of a neutron is ________________ MeV?
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A. 200

B. 0.8

C. 7.8

D. 10000

491. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?
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A. 1/A2

B. 1/A

C. D

D. A

492. Batch process is preferred over continuous process, when the___________________?
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A. All (A), B. & (C)

B. Same equipment cannot be used for several processes of the same nature

C. idence time

D. Sales demand of product is not steady

E. Product yields and quality cannot be achieved in continuous process, because of long

493. Pick out the wrong statement ?
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A. Tungsten steel and alnico are not hard magnetic materials

B. rcive forces

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

D. A ferromagnetic material becomes paramagnetic above the Curie temperature

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

F. erials

494. 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. 10000

B. +4000

C. -4000

D. -10000

495. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be _________________ toys ?
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A. 250

B. 500

C. 1000

D. 3000

496. Density in the solid state is slightly less than that in its liquid state, in case of____________________?
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A. Mercury

B. Water

C. Carbon dioxide

D. None of these

497. Consumable electrodes are used in the ____________________ welding?
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A. Gas

B. Resistance

C. Arc

D. Thermit

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

B. Aluminium

C. Copper

D. Steel
499. Load cells used for the measurement of weight has______________?
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A. No moving parts and incurs negligible deflection under load

B. Compact & rugged construction with an accuracy of 0.1 to 1%

C. Provision of thermal compensation and is hermetically sealed

D. All A, B & C
500. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by_________________?
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A. Increasing the concentration of zinc sulphate solution

B. Increasing the concentration of copper sulphate solution

C. Decreasing the surface area of the electrodes

D. Increasing the surface area of the electrodes