chemical engineering MCQs – Page 231

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 Review each marked answer and report any item that may be outdated or unclear.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
4601. Which of the following holds good for a solution obeying Raoults law (i.e., an ideal solution) (where, ?H = heat of mixing, and ?V = volume change on mixing) ?
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A. ?H = 1 (+ ve) and ? V = -ve

B. ?H = 0

C. ?V = 0

D. Both B. and C.
4602. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?
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A. Speed of response

B. Reproducibility

C. Static characteristics

D. Fidelity
4603. Very low pressure is expressed in microns (?), which is equal to ____________ mm of Hg column (absolute) at 0C?
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A. 0.001

B. 0.01

C. 0.1

D. 0.0001

4604. The evaporation of aqueous solution of sugar causes its molarity to__________________?
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A. Remain unchanged

B. Decrease

C. Either A. or B.; depends on the concentration of the solution

D. Increase

4605. Pick out the wrong statement ?
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A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons

B. Paramagnetic susceptibility of gases decreases with temperature

C. CO2 is the strongest paramagnetic gas

D. Paramagnetic susceptibility of gases permits the measurement of their concentration

4606. Phase lag of the sinusoidal response of a first order system is _________________?
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A. 120

B. 180

C. 30

D. 90
4607. Which of the following is not a differential pressure flow meter ?
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A. Rotameter

B. Orificemeter

C. Flow nozzle

D. Venturimeter

4608. The osmotic pressure of a solution increases, if its _____________ is decreased?
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A. Volume

B. Solute concentration

C. Temperature

D. None of these
4609. Temperature measuring instruments are standardised mostly with _____________ points of pure substances?
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A. Melting

B. Boiling

C. Both A. & B.

D. Neither A. nor B.

4610. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?
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A. The Laplace transform of integral of exp(at) has finite values only for s > a

B. The function exp(at) is piece-wise continuous only for s > a

C. The Laplace transform integral of exp(at) has initial values only for s > a

D. The function is exponential

4611. The transfer function for an ideal proportional plus reset controller (reset time T) is_______________?
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A. Kc(1 + TS)

B. Kc/[1 + (s/T)]

C. Kc/(1 + TS)

D. Kc[1 + (1/TS)]
4612. Radiation thermometer cannot measure the temperature ___________________?
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A. Inside a pressure vessel

B. Of an object without coming in contact with it

C. Of liquid oxygen

D. Of moving objects at high temperature

4613. Which of the following is not a composition measuring instrument ?
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A. Mass spectrometer

B. Hot wire anemometer

C. Polarograph

D. Thermal conductivity cell

4614. Hot wire anemometer is used for the measurement of___________________?
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A. Very high temperature

B. Flow rates of granular solids

C. Flow rates of fluids

D. Thermal conductivity of gases

4615. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?
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A. Unsaturated

B. Dry gaseous

C. Saturated

D. Superheated
4616. The response of two tanks of same size and resistance in series is __________________?
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A. None of the above

B. Critically damped

C. Under damped

D. Over damped

4617. Emission spectroscopy is used for__________________?
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A. Determination of CO2 in gases

B. Determining water purity

C. NOx determination

D. Solids and metal analysis
4618. The ______________ of a vapor pressure thermometer is a primary element?
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A. Bulb

B. Pointer

C. None of these

D. Bourdon tube

4619. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?
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A. All A , B & C.

B. Reducing the volume of the receiving element to a minimum

C. Reducing the volume of the capillary to a minimum

D. Making the volume of thermometer bulb as large as conveniently possible

4620. At 100C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150C is 4.69 atm. At 150C, the vapour pressure of methylcyclohexane would be expected to be_________________?
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A. Indeterminate due to lack of data

B. Significantly more than 4.69 atm

C. Nearly equal to 4.69 atm

D. Significantly less than 4.69 atm