chemical engineering MCQs – Page 230

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 Review each marked answer and report any item that may be outdated or unclear.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
4581. One kg of saturated steam at 100C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________?
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A. 540

B. 2263

C. 40732

D. 2676

4582. Which of the following thermometers is not suitable for distant reading upto 60 metres ?
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A. Constant volume gas thermometer

B. Resistance thermometer

C. Mercury in glass thermometer

D. Vapor pressure thermometer

4583. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?
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A. w = ?(7/8), Kc = 45/4

B. w = 1/?14, Kc = 45/7 ?14

C. w = ?(7/6), Kc = 46/3

D. w = 1, Kc = 13

4584. Which of the following is a contact pyrometer ?
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A. Radiation pyrometer

B. Infra red pyrometer

C. Optical pyrometer

D. Resistance pyrometer
4585. In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)?
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A. Outlet flow rate

B. Level

C. Both A. & B.

D. Neither A. nor B.

4586. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
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A. Temperature measuring range (- 40C to 450C)

B. All a, b & c

C. Accuracy ( 1% of span)

D. Speed of response

4587. The temperature of tempering oil baths maintained at 400C during heat treatment of steel is measured by a/an _____________ thermocouple?
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A. Chromel-alumel

B. None of these

C. Iron-constantan

D. Platinum-platinum/rhodium

4588. The _____________ of a vapor pressure thermometer is a functioning element?
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A. Bulb

B. Bourdon tube

C. None of these

D. Pointer
4589. Working principle of disappearing filament type optical pyrometer is based on the ________________?
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A. Seebeck effect

B. Wiens law

C. Peltier effect

D. Kirchoffs law

4590. Continuous measurement of moisture in paper is done by_______________?
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A. High resistance Wheatstone bridge circuit

B. Sling psychrometer

C. Weighing

D. Hair-hygrometer

4591. Cp equals Cv at________________?
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A. 0C

B. 0F

C. 0K

D. 0R

4592. The pressure of V litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become___________________?
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A. 2V

B. V/2

C. V/4

D. V2

4593. Identify an unbounded input from inputs whose transfer functions are given below______________?
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A. 1/S2

B. 1

C. 1/(S2 + 1)

D. 1/S

4594. Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume X diffuses twice as fast as another perfume Y; what is the molecular weight of Y, if the vapor density of gas X is 2? Molecular weight of gas X is to be assumed to be 2 ?
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A. 16

B. 2

C. 4

D. 8

4595. Mercury thermometer can be used to measure the temperature upto ____________ C?
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A. 250

B. 750

C. 100

D. 350
4596. The elevation in boiling point of a solution is proportional to the ______________ of the solution?
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A. Normality

B. Reciprocal of the molal concentration

C. Molarity

D. Molal concentration
4597. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?
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A. Methyl alcohol

B. Carbon-tetrachloride

C. Water

D. Mercury
4598. Temperature measurement by optical pyrometer is done above ____________ point, which is 1063C ?
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A. Nickel

B. Antimony

C. Silver

D. Gold
4599. The heat change for the reaction, C(s) + 2S(s) ? CS2(l), is 104.2 kJ. It represents the heat of_________________?
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A. Formation

B. Combustion

C. Fusion

D. Solution

4600. A barometer measures the _____________ pressure?
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A. Absolute

B. dynamic

C. Absolute as well as gauge

D. Gauge