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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows ____________ law?
A Hyperbolic
B Parabolic
C Linear
D Logarithmic
Correct Answer: Linear
Viscous & heat sensitive liquids are concentrated in _____________ evaporators?
A Open pan
B Long tube
C Agitated film
D None of these
Correct Answer: Agitated film
In case of surface condensers, a straight line is obtained on plotting 1/U vs. ____________ on an ordinary graph paper?
A 1/V̅ -0.8
B V̅ -0.8
C V̅ -2
D 1/ V̅ -2
Correct Answer: 1/V̅ -0.8
Viscosity of gases ______________ with increase in temperature?
A Increase very rapidly
B Increase slowly
C Decrease slowly
D Remain unaffected
Correct Answer: Increase slowly
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?
A At high fluid velocity
B At low velocity
C When fluid flows past a smooth surface
D None of these
Correct Answer: At high fluid velocity
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?
A Higher condensing film co-efficient is desired
B Condensate is corrosive in nature
C Lower pressure drop through the exchanger is desired
D Temperature of the incoming vapor is very high
Correct Answer: Condensate is corrosive in nature
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?
A Cube
B Plate
C Sphere
D All will cool at the same rate
Correct Answer: Sphere
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions? Assume that the conductive heat transfer co-efficient is infinitely large ?
A 5 minutes
B 10 minutes
C 20 minutes
D 40 minutes
Correct Answer: 5 minutes
Presence of a non-condensing gas in a condensing vapour___________________?
A Increases the rate of condensation
B Decreases thermal resistance
C Is desirable to increase the film co-efficient
D None of these
Correct Answer: None of these
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe) ?
A K/h0
B 2K/h0
C hi/K
D 2hi/K
Correct Answer: K/h0
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