chemical engineering MCQs – Page 228

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 Review each marked answer and report any item that may be outdated or unclear.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
4541. Stroboscope is used for the measurement of _________________?
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A. Frequency of light

B. Rpm of a flywheel

C. Liquid level under pressure

D. Depression of freezing point

4542. Concentration of sugar solution can be determined by the__________________?
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A. Emission spectroscopy

B. Polarimetry

C. Oscillometry

D. Flame photometry

4543. Process degree of freedom indicates _______________ number of controllers to be used?
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A. The maximum

B. The minimum

C. Both maximum and the minimum

D. Nothing about the

4544. Thermal conductivity measurement com-prises the working principle of a_________________?
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A. CO2 analyser

B. Chromatograph

C. Polarimeter

D. Spectrometer

4545. A bolometer is __________________?
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A. Used for the measurement of thermal radiation

B. An element which senses optical input and delivers thermal output

C. Both A. & B.

D. Neither A. nor B.

4546. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?
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A. Mercury in glass thermometer

B. Alcohol filled thermometer

C. Iron-constantan thermocouple

D. Optical pyrometer
4547. The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?
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A. Volume

B. All A., B. and C.

C. Pressure

D. Viscosity

4548. Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________?
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A. External float gage

B. None of these

C. Gage glass

D. Differential pressure gage
4549. For a reaction, X ? Y, if the concentration of X is tripled; the rate becomes nine times. The order of reaction is__________________?
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A. 1

B. 0

C. 3

D. 2
4550. Measurement of pressure in ammonia reactor is done by __________________?
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A. Bourdon gauge

B. U-tube manometer

C. Pirani gauge

D. Inclined tube manometer

4551. The heat of adsorption of a gas caused by Van der Waals forces of attraction and capillarity is equal to the heat of__________________?
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A. Difference of A. and B.

B. Sum of A. and B.

C. Normal condensation

D. Wetting

4552. ______________ controller has the maximum stabilising time?
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A. P

B. PI

C. PD

D. PID

4553. Strain gage pressure transducers are used to measure _____________ pressures?
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A. Gage as well as vacuum

B. Absolute as well as differential

C. Both A. and B.

D. Neither A. nor B.

4554. Kopps rule is concerned with the calculation of__________________?
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A. Heat capacity

B. Viscosity

C. Surface tension

D. Thermal conductivity

4555. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( 0.1s)/(0.5s + 1) are known with a possible error of 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?
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A. 12, 0.6, 0.12

B. 12, 0.4, 0.08

C. 8, 0.6, 0.12

D. 8, 0.6, 0.08

4556. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?
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A. 1

B. 8

C. 4

D. 2

4557. ____________ stability method uses open loop transfer function?
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A. Mikhailov

B. Ruth

C. Nyquist

D. None of these

4558. Which of the following does not figure in the list of seven substances selected for international temperature scale ?
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A. Ice (F.P) and steam (B.P)

B. Oxygen and sulphur (B.P)

C. Zinc (B.P) and mercury (F.P)

D. Antimony and silver (F.P)

4559. The amplitude ratio for the sinusoidal response of __________ is < 1?
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A. First order system

B. Second order system

C. Transportation lag

D. None of these

4560. Composition of alloys can be determined by _________________?
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A. Refractometer

B. None of these

C. Polarograph

D. Chromatograph