Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 235 of 557.

Chemical Engineering MCQs

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If response of a control system is to be free of offset and oscillation, the most suitable controller is________?

A.Proportional-derivative (PD) controller

B.Proportional controller

C.Proportional integral-derivative (PID) controller

D.Proportional-integral (PI) controller

Explanation: The correct answer is Proportional integral-derivative (PID) controller.

Submitted by: Academy of Pakistan

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Acetone is produced by catalytic dehydrogenation of________?

A.Naphthalene

B.Phenol

C.Ethyl benzene

D.Isopropanol

Explanation: The correct answer is Isopropanol.

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Steam is intermittently admitted into the fuel bed during the production of producer gas to________?

A.Minimise the chances of clinker formation

B.Increase the gas production rate

C.Convert CO to CO2

D.Increase the combustion rate

Explanation: The correct answer is Minimise the chances of clinker formation.

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Sewage sludge is an example of the ________ fluid?

A.Pseudo plastic

B.Dilatent

C.Bingham plastic

D.Newtonian

Explanation: The correct answer is Bingham plastic.

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Gas cooling as compared to water cooling of nuclear reactors________?

A.Is more efficient as gas has a higher specific heat

B.None of these

C.Cannot attain a high temperature

D.Can produce only saturated steam for feeding to power turbine

Explanation: The correct answer is None of these.

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Which of the following polymers is used for making a non stick coating on frying pans?

A.Perspex

B.Teflon

C.Bakelite

D.PVC

Explanation: The correct answer is Teflon.

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In most of the vacuum crystalliser, vacuum is generally produced by means of a________?

A.Steam jet ejector with a barometric condenser

B.Compressed air jet

C.None of these

D.Suction pump

Explanation: The correct answer is Steam jet ejector with a barometric condenser.

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The lowest layer of atmosphere is known as the________?

A.Stratosphere

B.Ionosphere

C.None of these

D.Troposphere

Explanation: The correct answer is Troposphere.

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The activity of pure hydrogen gas at 1000°C and 5 atm pressure________?

A.Depends on the choice of the standard state

B.Is always greater than 1

C.Is always less than 1

D.Can be 5

Explanation: The correct answer is Depends on the choice of the standard state.

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Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?

A.Bleaching

B.None of these

C.Digestion

D.Depithing

Explanation: The correct answer is Depithing.

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The function of an economiser in a boiler is to preheat the ________?

A.Pulverised coal

B.Feedwater

C.Combustion air

D.Furnace oil

Explanation: The correct answer is Feedwater.

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What is the reflux ratio at total reflux?

A.Infinity

B.Zero

C.Unity

D.Data insufficient

Explanation: The correct answer is Infinity.

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Metalloid is________?

A.An element which exhibits the properties of both metal & non-metal

B.Highly electronegative in nature

C.An alloy

D.All A., B. and C.

Explanation: The correct answer is An element which exhibits the properties of both metal & non-metal.

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Gross and net calorific value of a fuel will be the same________?

A.If its ash content is zero

B.If its carbon content is very low

C.Under no circumstances

D.If its hydrogen/hydrogen compound content is zero

Explanation: The correct answer is If its hydrogen/hydrogen compound content is zero.

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1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is________?

A.0.25

B.0.2

C.0.4

D.0.175

Explanation: The correct answer is 0.2.

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