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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

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?
A Lower tube side pressure drop
B Lower shell side pressure drop
C Higher tube side heat transfer co-efficient
D Higher shell side heat transfer co-efficient
Correct Answer: Higher tube side heat transfer co-efficient
The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?
A Von-Karman
B Reynolds
C Colburn
D Prandtl
Correct Answer: Prandtl
Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?
A Scaling
B Highly viscous
C Corrosive
D Salty
Correct Answer: Highly viscous
When warm and cold liquids are mixed, the heat transfer is mainly by_______________?
A Conduction
B Convection
C Radiation
D Both A. & C.
Correct Answer: Convection
At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?
A Decrease
B Increase
C Remain unchanged
D May increase or decrease; depends on the pressure
Correct Answer: Decrease
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?
A 2
B 20.8
C 20.2
D 20.5
Correct Answer: 2
It is not preferable to use superheated steam in evaporators, because of its very_________________?
A High temperature
B High pressure
C Low film co-efficient
D None of these
Correct Answer: Low film co-efficient
_____________ heat exchanger is used for chilling oil to be dewaxed?
A U-tube
B Double pipe
C Fixed tube
D Floating head
Correct Answer: Double pipe
If heat transfer rate varies with the time, it is termed as__________________?
A Forced convection
B Steady state conduction
C Monochromatic radiation
D None of these
Correct Answer: None of these
The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?
A 165.4
B 167.5
C 172.5
D 175
Correct Answer: 165.4
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