A. Linear relation of emf to temperature
B. Corrosion resistance
C. Oxidation resistance
D. Non-linear relation of emf to temperature
CHEMICAL ENGINEERING
Low pressure Zeigler process of polythene manufacture____________________?
A. Employs a pressure of 30 kgf/cm2
B. Achieves an yield of 95-98% based on ethylene
C. Produces very low density polythene
D. Does not use any catalyst for polymerisation
Heat transfer co-efficient (h1) for liquids increases with__________________?
A. Increasing temperature
B. Decreasing temperature
C. Decreasing Reynolds number
D. None of these
Tar is a better fuel than furnace oil, because of its___________________?
A. Higher calorific value
B. Lower sulphur content
C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate
D. Both A. and B.
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
A. Wet grinding in low viscous suspension
B. Wet grinding in high viscous suspension
C. Dry grinding of large particles (upto 1.25 cms)
D. Dry grinding of large particles in un-baffed mills
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of ____________________?
A. Thermal cracking
B. Gum formation
C. Coking
D. Discoloration
In hot wire anemometer used for gas flow measurement, the wire is normally made of ______________________?
A. Copper
B. Platinum
C. Constantan
D. Chromium
Pick out the correct statement ?
A. In an isothermal system, irreversible work is more than reversible work
B. Under reversible conditions, the adiabatic work is less than isothermal work
C. Heat, work, enthalpy and entropy are all ‘state functions’
D. Matter and energy cannot be exchanged with the surroundings in a closed system
Thermal wells are used in the temperature measurement to____________________?
A. Guard against corrosive and oxidising action on thermocouple materials
B. Reduce measuring lag
C. Increase the fidelity
D. Increase the sensitivity
The unity of Planck’s constant ‘h’ in the equation, E = hv is____________________?
A. J/s
B. J.S
C. J/kmol
D. kmol/J
