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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

Which of the following is correct ?
A Rate = Driving force × Resistance
B Driving force = Rate × Resistance
C Resistance = Driving force × Rate
D Rate = Resistance/Driving force
Correct Answer: Driving force = Rate × Resistance
Pick out the wrong statement ?
A Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient
B In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles
C S.I. unit of fouling factor is Watt/m2.°K
D Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube
Correct Answer: S.I. unit of fouling factor is Watt/m2.°K
Pick out the wrong statement ?
A In case of heat transfer by purely forced convection, GR/Re 2 ≤ 1
B The equivalent diameter of heat transfer for a duct of square cross-section (having each side as
C Distillation process is not the same as evaporation
D The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are
Correct Answer: The equivalent diameter of heat transfer for a duct of square cross-section (having each side as
Pick out the wrong statement?
A The capacity of an evaporator is reduced by the boiling point elevation
B Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger
C Steam jet ejector is used for vapor compression in a thermal recompression evaporator
D Heat sensitive materials should be concentrated in high pressure evaporators
Correct Answer: Heat sensitive materials should be concentrated in high pressure evaporators
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?
A Higher economy
B Lower capacity
C Both A. & B.
D Lower economy
Correct Answer: Higher economy
For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?
A Forward
B Backward
C Parallel
D None of these
Correct Answer: Backward
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?
A 15 min
B 22 min
C 44 min
D 51 min
Correct Answer: 51 min
Heat waves_____________________?
A Cannot pass through vacuum
B Travel in straight line
C Can be reflected by a mirror
D Both B. and C.
Correct Answer: Both B. and C.
If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?
A Increase
B Decrease
C Not affect
D Increase the condensing film co-efficient as well as
Correct Answer: Decrease
For a perfectly transparent surface (like gases), the____________________?
A Absorptivity = 0
B Transmissivity = 1
C Reflectivity = 0
D All A., B. & C.
Correct Answer: Transmissivity = 1
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