chemical engineering MCQs – Page 30

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 Review each marked answer and report any item that may be outdated or unclear.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
581. Atomic _________________ of an element is a whole number ?
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A. Number

B. Radius

C. Volume

D. Weight

582. In a forced draft cooling tower, water is cooled from 95 to 80F by exposure to air with a wet bulb temperature of 70F. In this case, the________________?
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A. Range is 15F

B. Approach is 10F

C. Both A. & B.

D. Neither A. nor B.

583. Steel & cast iron pipes are produced by ______________ casting ?
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A. Slush

B. True centrifugal

C. Die

D. Investment

584. Tip of the match stick contains a mixture of________________?
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A. S + K2Cr2O7 + White P

B. None of these

C. K + S

D. K + S + K2Cr2O7

585. All the atoms of the world comprise of electrons, proton & neutron except that of ______________ atom in which neutron is absent ?
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A. Deuterium

B. Neon

C. Hydrogen

D. Helium

586. Pick out the wrong statement?
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A. Hardenability & Weldability of metals are inversely related

B. Covalent bonding formed by sharing of electrons is present in all semi-conductor materials

C. Copper is the metal having the highest electronic conductivity

D. Glass transition temperature applies to polymers but not to glasses

587. Which of the following pairs is not correctly matched ?
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A. Uranium 233 : Fertile material

B. Number of nucleons : Mass number

C. Scattering: Absorption cross-section

D. Binding energy : Mass defect

588. Water hammer is caused in steam carrying pipelines, because of ______________________?
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A. Vibration of the pipeline

B. Its exposure to torrential rain

C. High degree of superheat of steam

D. Partial condensation of steam
589. With increase in temperature, the electrical conductivity of a _________________ decreases ?
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A. Dielectric

B. Metal or alloy

C. None of these

D. Semi-conductor
590. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?
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A. A1 is more alkaline than solution A2

B. A1 is highly acidic

C. A2 is very slightly acidic

D. Both B. & C.
591. An abrupt and sudden fall in the reading of barometer is an indication of the____________________?
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A. Clear weather

B. Storm

C. Rain

D. Cold wave

592. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal_________________?
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A. Youngs modulus

B. Thermal co-efficient of expansion

C. Compressive strength

D. Tensile strength

593. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?
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A. Inversely proportional to

B. Independent of

C. Directly proportional to

D. None of these

594. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________?
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A. R ln 2

B. -R ln 2

C. 3 R ln 2

D. -3R ln 2

595. Spark plug is provided in a/an_________________?
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A. Engine having carburettor

B. Diesel engine

C. Compression ignition engine

D. Both B. & C.

596. _______________ rubber is generally used for making O rings used for vacuum sealings?
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A. Natural

B. Nitrile

C. Butadiene

D. Neoprene
597. 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. Hydrogen is not present in the fuel

B. Excess air has been used for combustion

C. Pure oxygen has been used for combustion

D. Nitrogen percentage in the fuel is very high

598. _____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500C ?
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A. Supermax

B. Lead

C. High silica

D. Borosilicate

599. 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. D

C. 1/A

D. A

600. Viscoelastic behaviour is observed in _______________________ materials?
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A. All crystalline

B. Ceramic

C. Non-crystalline organic polymeric

D. All amorphous