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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 outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?
A Its evaporation loss
B Excessive corrosion
C Uneconomic LMTD
D Decrease in heat exchanger efficiency
Correct Answer: Excessive corrosion
The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?
A Forced convection
B Natural convection
C Transient conduction
D Steady state conduction
Correct Answer: Transient conduction
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?
A Cube
B Cylinder
C Sphere
D Equal for all the three
Correct Answer: Cube
Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
A Dittus-Boelter equation
B Sieder-Tate equation
C Nusselt equation
D None of these
Correct Answer: Sieder-Tate equation
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?
A hf = hd
B hf > hd
C hf < hd
D hf could be greater or smaller than hd
Correct Answer: hf < hd
Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________________?
A Eddies current
B Conduction
C Convection
D None of these
Correct Answer: Conduction
_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?
A Single pass, fixed tube sheet
B U-tube
C Three pass, fixed tube sheet
D None of these
Correct Answer: U-tube
Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?
A 0.4 – 0.6
B 1-1.3
C 1.8-2
D 2 – 2.4
Correct Answer: 1-1.3
Thermal conductivities of most of the liquids _______________ with rise in temperature?
A Increases
B Decreases
C Remains unchanged
D May increase or decrease; depends on the liquid
Correct Answer: Decreases
The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?
A Create vacuum
B Regulate the vapor flow
C Vent the non-condensable gases
D Arrest the entrained liquid
Correct Answer: Arrest the entrained liquid
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