Has the unit m² /sec
Is defined as K/ρ . Cp
Is the ratio of thermal conductivity to thermal capacity
All of the above
✅ The correct answer is option D.
Engineering
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2542. What is the unit of thermal conductivity ?
Kcal/hr. m² °C
Kcal/hr.m.°C
Kcal/hr.m
Kcal/hr. °C
✅ The correct answer is option B.
2543. Which of the following is used as a catalyst in fluidised bed catalytic cracking ?
Silica-magnesia
Silica-alumina
Bentonite clays
All (a), (b) and (c)
✅ The correct answer is option D.
2544. Presence of aromatics in
diesel increases its cetane number.
kerosene increases its smoke point.
petrol increases its octane number.
all (a), (b) and (c).
✅ The correct answer is option C.
2545. In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
sulphur increases
sulphur decreases
nitrogen decreases
none of these
✅ The correct answer is option A.
2546. In a forward feed multiple effect evaporator unit
Viscosity of liquid is highest in first effect
Transfer from effect to effect is done by pumps
No pump is required to withdraw the product from the last effect
None of these
✅ The correct answer is option D.
2547. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
Surrounding temperature
Average temperature of the fin
Temperature of the fin end
Constant temperature equal to that of the base
✅ The correct answer is option D.
2548. Aniline point test of an oil qualitatively indicates the __________ content of an oil.
paraffin
olefin
aromatic
naphthene
✅ The correct answer is option C.
2549. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F. gas and coke oven gas
✅ The correct answer is option A.
2550. In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is
Infinity
Zero
Same as average heat transfer co-efficient for tube side
None of these
✅ The correct answer is option A.