chemical engineering chemical engineering basics MCQs – Page 25

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 Review each marked answer and report any item that may be outdated or unclear.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

481. The life of a ball bearing is inversely proportional to________________?
0

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?
0

A. Gaseous medium

B. Oxygen

C. Air

D. Liquid medium

483. Which of the following materials has the poorest electrical conductivity ?
0

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_________________?
0

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____________________?
0

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________________?
0

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?
0

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) ?
0

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 ?
0

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 ?
0

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 ?
0

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____________________?
0

A. Zinc

B. Aluminium

C. Copper

D. Steel

499. Load cells used for the measurement of weight has______________?
0

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_________________?
0

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

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