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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 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,
Pick out the wrong statement ?
A The controlling resistance in case of heating of air by condensing steam is in the air fil
B The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature
C In case of a 1 – 2 shell and tube heat exchanger, the LMTD correction factor value increases
D Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature
Correct Answer: In case of a 1 – 2 shell and tube heat exchanger, the LMTD correction factor value increases
Pick out the wrong statement?
A Orifice baffles are never used in a shell and tube heat exchanger
B Pressure drop on the shell side of a heat exchanger depends upon tube pitch also
C In a horizontal tube evaporator, surface blanketing by air is avoided
D Split ring type and pull through type floating heads are two commonly used floating heads is
Correct Answer: Orifice baffles are never used in a shell and tube heat exchanger
Pick out the wrong statement?
A Reciprocal of the resistance to heat flow is called thermal conductance
B Unit of thermal conductance is W/°K
C Thermal conductance of a wall of thickness ‘L’, thermal conductivity ‘k’ and heat flow area ‘A’ is kL/A
D None of these
Correct Answer: Thermal conductance of a wall of thickness ‘L’, thermal conductivity ‘k’ and heat flow area ‘A’ is kL/A
Pick out the wrong statement?
A Swenson-Walker crystalliser is a batch crystalliser
B Super saturation of the solution is the driving potential for a crystal growth
C The liquor left after the removal of crystals from a solution is called mother liquor
D The first stage of crystal formation is called nucleation
Correct Answer: Swenson-Walker crystalliser is a batch crystalliser
Pick out the wrong statement ?
A Heat transfer by radiation cannot occur across an absolute volume
B In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles
C Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light
D The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same
Correct Answer: Heat transfer by radiation cannot occur across an absolute volume
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