chemical engineering MCQs – Page 346

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
6901. A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
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A. 5

B. 100

C. 250

D. 500

6902. Air vessel provided in a reciprocating pump is for__________________?
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A. None of these

B. Making the friction in pipe uniform

C. Increasing the acceleration head

D. Decreasing the acceleration head

6903. Lenzs law results from the law of conservation of___________________?
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A. Momentum

B. Energy

C. None of these

D. Mass

6904. Hastelloy C is a good material of construction in chemical process industry, since it is ___________________?
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A. Light and resists attack by acids

B. Highly corrosion resistant and is readily fabricated

C. Relatively inexpensive although it can be fabricated with some difficulty

D. Corrosion resistant to most alkalis, particularly because of its copper content

6905. Unit of mass velocity is__________________?
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A. kg/m2. hr

B. kg/m3. hr

C. kg/m2

D. kg/hr

6906. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with__________________?
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A. Rubber

B. Lead or acid-proof bricks

C. Karbate

D. Acidic refractory

6907. Thermoplastic resins are those polymers, which____________________?
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A. Easily deform under pressure at high temperature

B. Cannot be moulded

C. None of these

D. Has decreased plasticity at increasing temperature

6908. Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
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A. 12.6 H

B. H

C. 13.6 H

D. 14.6 H

6909. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
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A. None of these

B. Yield point

C. Ultimate

D. Proof
6910. The most distinguished property of malleable cast iron is its high_________________?
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A. Hardness

B. Ductility

C. Malleability

D. None of these

6911. At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure?
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A. Decreases

B. Increases

C. Remains unchanged

D. May increase or decrease; depends on the gas

6912. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?
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A. Orificemeter

B. Rotameter

C. Venturimeter

D. Pitot tube
6913. Steel balls for ball bearings are generally made of ______________ steel?
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A. Cast

B. Carbon chrome

C. Stainless

D. Free carbon

6914. Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?
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A. None of these

B. Silicon steel

C. Molybdenum steel

D. Chromium steel

6915. The material of construction of bearings is__________________?
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A. Babbitt metal

B. Cast iron

C. Pig iron

D. Steel

6916. Path followed by water jet issuing from the bottom of a water tank will be a__________________?
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A. Horizontal straight line

B. Zig-zag path (which is geometrically undefined)

C. Parabola (vertex being at the opening)

D. Hyperbola

6917. The continuity equation___________________?
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A. Represents the conservation of mass

B. None of these

C. Is dependent upon the viscosity of the fluid

D. Is independent of the compressibility of the fluid

6918. _______________ is a donor impurity for semi-conductors ?
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A. Gallium

B. Antimony

C. Boron

D. None of these

6919. Karbate is____________________?
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A. A mixture of iron dust and saw dust

B. Carbon impregnated with resin (usually Bakelite)

C. An acid resistant material

D. Both B. and C.
6920. Which of the following finds the least commercial use ?
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A. High carbon steel

B. Pure iron

C. Low carbon steel

D. High silicon iron