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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

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?
A Resistances in parallel
B Capacitors in series
C Resistances in series
D None of these
Correct Answer: Resistances in series
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
A 1
B 1
C
D None of these
Correct Answer: 1
Heat transfer by natural convection is enhanced in system with__________________?
A High viscosity
B High co-efficient of thermal expansion
C Low temperature gradients
D Low density change with temperature
Correct Answer: High co-efficient of thermal expansion
Reynold’s analogy states that (where, St = Stanton number f = friction factor) ?
A St = f/2
B St = f/4
C St = 4f
D St = f1/2
Correct Answer: St = f/2
A dephlegmator is a_____________________?
A Total condenser
B Vacuum evaporator
C Partial condenser
D Double pipe heat exchanger
Correct Answer: Partial condenser
Film boiling is usually not desired in commercial equipments, because____________________?
A The heat transfer rate is low in view of the large temperature drop
B It is difficult to maintain
C It is not economic
D None of these
Correct Answer: The heat transfer rate is low in view of the large temperature drop
The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?
A Heat sensitive material can be handled
B There is no additional cost of pumping
C Most concentrated liquid is at highest temperature
D Equal heat transfer co-efficients exist in various effects
Correct Answer: Most concentrated liquid is at highest temperature
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side ______________ the heat transfer rate?
A Increases
B Decreases
C Does not affect
D May increase or decrease, depends on the type of baffle
Correct Answer: Increases
With the increase of temperature, the Col-burn jH factor_____________________?
A Increases
B Decreases
C Remains unchanged
D May increase or decrease; depending on temperature
Correct Answer: Increases
Electromagnetic radiations propagate in vacuum with a velocity of _______________ metre/second?
A 3 × 105
B 3 × 108
C 3 × 1010
D 3 × 1012
Correct Answer: 3 × 108
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