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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

Pick out the wrong statement ?
A In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2
B Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number
C Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger
D Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side
Correct Answer: Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger
Pick out the wrong statement/
A The emissivity of a surface decreases, if it gets corroded by atmospheric environment
B The emissivity of a surface increases with increase in surface roughness
C The emissivity of a polished surface is quite low
D The emissivity of a non-metallic surface decreases with increase in the temperature
Correct Answer: The emissivity of a surface decreases, if it gets corroded by atmospheric environment
Pick out the wrong statement?
A In process heat exchangers, saturated steam is preferred over the superheated steam
B The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength
C When a vertical plate is heated in infinite air environmental under natural convection
D A body at 925 K emits an energy of 1.42 x 1011ζW/m2 (ζ is the Stefan-Boltzmann constant) in
Correct Answer: The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength
Pick out the correct equation ?
A jH = (St)(Pr)2/3 = f/2
B jH = (St)(Pr)1/3 = f/2
C jH = (St)2/3(Pr) = f/2
D jH = (St)1/3(Pr) = f/2
Correct Answer: jH = (St)(Pr)2/3 = f/2
Pick out the wrong statement ?
A Economy of a multiple effect evaporator is not influenced by the boiling point elevation
B Two identical cubes of iron and copper will have the same heat content under the same
C Double pipe heat exchangers are mostly used in the field of refrigeration
D Finned tube heat exchangers are suitable for heating air by steam
Correct Answer: Two identical cubes of iron and copper will have the same heat content under the same
Pick out the correct statement ?
A Higher is the temperature of the radiating body, higher is the wavelength of radiation
B Logarithmic mean area is used for calculating the heat flow rate through a thick walled
C The wavelength corresponding to maximum mono-chromatic emissive power increases with
D Solid angle subtended by the finite surface at the radiating element is called the angle of
Correct Answer: Logarithmic mean area is used for calculating the heat flow rate through a thick walled
Pick out the wrong statement ?
A ‘Solvates’ are chemical compounds formed by solute with their solvents. When water is the
B In heat exchanger calculations (Δt) weighted is used in place of Δt, when it involves more
C Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted
D In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the
Correct Answer: Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted
Choose the correct equation ?
A Nu = (Re) (Pr) (Gz)
B Nu = (Re) (Pr) (St)
C Nu = (Re) (Pr)
D Nu = (Pr) (St)
Correct Answer: Nu = (Re) (Pr) (St)
Pick out the wrong statement ?
A With change in temperature, the radiant energy emitted by a black body remains unchanged
B Absorptivity of a body approaches unity in case of diffuse reflection
C Absorptivity of a perfectly black body is unity
D Value of Stefan-Boltzmann constant is 4.876 × 10-8 KCal/m2.hr.°K4
Correct Answer: With change in temperature, the radiant energy emitted by a black body remains unchanged
Pick out the wrong statement ?
A The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation
B Film co-efficient for vaporisation decreases as a result of vapor binding
C In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile
D Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film coefficient,
Correct Answer: Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film coefficient,
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