chemical engineering MCQs – Page 227

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 Review each marked answer and report any item that may be outdated or unclear.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
4521. Change of angle of refraction with composition comprises the working principle of a___________________?
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A. Polarograph

B. Polarimeter

C. Spectrometer

D. Refractometer
4522. A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?
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A. Current

B. Flux density

C. Voltage

D. Light intensity
4523. Optical activity of a solution can be determined using a ___________________?
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A. Polarograph

B. Refractometer

C. Polarimeter

D. Dilatometer

4524. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
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A. Manipulated

B. None of these

C. Controlled

D. Load

4525. A simple pitot tube measures the___________________?
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A. Point velocity

B. Average velocity

C. Maximum velocity

D. Static pressure
4526. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?
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A. Exponential decrease

B. No change

C. Decrease

D. Increase
4527. Flow rate through an orifice is _____________ the pressure differential?
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A. Proportional to

B. Proportional to the square root of

C. Inversely proportional to the square root of

D. Inversely proportional to the square of

4528. Temperature of molten pig iron (1450C) and molten slag (1500C) flowing out of a blast furnace is measured by a/an_______________?
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A. Radiation pyrometer

B. Chromel-alumel thermocouple

C. Either B. or C.

D. Optical pyrometer

4529. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?
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A. 1

B. 2

C. 0.05

D. 0.5
4530. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5C) ?
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A. API = (140/G) 130

B. API = 200(G 1)

C. API = 145 (145/G)

D. API = (141.5/G) 131.5
4531. pH meter has ____________________?
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A. Two cells

B. Three cells

C. One cell

D. No cell

4532. An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?
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A. Is saturated

B. Is unsaturated

C. Shows positive deviation from Raoults law

D. Shows negative deviation from Raoults law

4533. Reset rate is the another term used for ____________ time?
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A. None of these

B. Integral

C. Derivative

D. Dead

4534. The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?
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A. Reducing value of Kc

B. Introducing derivative control

C. None of the above

D. Introducing integral control
4535. For an ideal gas, the compressibility factor________________?
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A. Decreases with pressure rise

B. Is unity at all temperature

C. Is unity at Boyles temperature

D. Zero

4536. Emf developed by a thermocouple while measuring a temperature of 800C is about 31 mV. The type of thermocouple used is________________?
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A. None of these

B. Platinum-platinum + rhodium

C. Iron-constantan

D. Chromel-alumel
4537. Temperature of _____________ cannot be measured by an optical or radiation pyrometer?
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A. Molten slag flowing out of blast furnace

B. Rotary limestone calcination kiln

C. Hot blast (air) from stoves

D. Combustion space in boilers

4538. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
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A. 1

B. < 1

C. None of these

D. > 1

4539. Validity of the relationship, inputs = outputs, holds good for the system at steady state________________?
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A. Without chemical reaction & losses

B. Without chemical reaction

C. With chemical reaction

D. None of these

4540. A pyranometer is an instrument used for measuring the___________________?
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A. Beam radiation

B. Global radiation

C. Bright sunshine period

D. None of these