Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 309 of 557.

Chemical Engineering MCQs

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Pick out the wrong statement?

A.Mild steel sheet cannot be spot welded

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

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

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

Explanation: The correct answer is Mild steel sheet cannot be spot welded.

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Urea autoclave is made of________?

A.Refractory blocks

B.Stainless steel

C.Lead lined steel

D.Cast iron

Explanation: The correct answer is Stainless steel.

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A liquid under pressure greater than its vapour pressure for the temperature involved is called a ________ liquid?

A.Non-solidifiable

B.Saturated

C.None of these

D.Sub-cooled

Explanation: The correct answer is Sub-cooled.

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Which of the following material is seldom used for pressure vessel construction?

A.Mild steel

B.Killed steel

C.Semi-killed steel

D.Rimmed still

Explanation: The correct answer is Rimmed still.

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

A.Magnetic permeabilities

B.Densities

C.Hardness

D.Electrical conductivities

Explanation: The correct answer is Electrical conductivities.

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Bottom product of atmospheric pressure crude oil distillation column is termed as________?

A.Residuum

B.Reduced crude

C.Heavy ends

D.Asphalt

Explanation: The correct answer is Reduced crude.

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Ethyl alcohol cannot be produced________?

A.None of these

B.By Esterification and hydrolysis of ethylene

C.From waste sulphite substrate of paper mills

D.From molasses

Explanation: The correct answer is None of these.

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The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the________?

A.Larger reactors have more space time compared to smaller ones

B.Space time for each parallel line is same

C.Space time for parallel lines is different

D.None of these

Explanation: The correct answer is Space time for each parallel line is same.

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The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is________?

A.1.5

B.2

C.0.5

D.1

Explanation: The correct answer is 2.

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Fuel combustion is never cent per cent efficient due to________?

A.Incomplete combustion

B.All A., B. and C.

C.Dry gas/stack gas loss

D.Moisture loss

Explanation: The correct answer is All A., B. and C..

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Thermal efficiency of furnaces can be improved by________?

A.Maintaining proper draught

B.All A., B. and C.

C.Minimising heat losses from furnace walls

D.Waste heat recovery from flue gas

Explanation: The correct answer is All A., B. and C..

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Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda?

A.None of these

B.Diaphragm electrolytic cell process

C.Lime-soda process

D.Mercury electrolytic cell process

Explanation: The correct answer is Lime-soda process.

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The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ________ times?

A.Four

B.Two

C.Eight

D.Six

Explanation: The correct answer is Two.

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Pick out the wrong statement?

A.Normally, the gases which are easily liquefied are more soluble in common solvents

B.The gases which are capable of forming ions in aqueous solution are much more soluble in

C.At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature

D.At constant pressure, solubility of a gas in a liquid increases with rise in temperature

Explanation: The correct answer is At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature.

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(NRe. NSc) is termed in mass transfer operation as the ________ number?

A.Stanton

B.None of these

C.Sherwood

D.Peclet

Explanation: The correct answer is Peclet.

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