2551. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.
Twice
Four times
Square root of
Square of
✅ The correct answer is option B.
Chemical Engineering
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2552. Research octane number refers to the
low octane number motor fuels.
high octane number motor fuels.
high octane number aviation fuels.
unleaded motor fuels.
✅ The correct answer is option D.
2553. Smoke point of a good burning kerosene may be around __________ mm.
0-5
20-25
60-75
100-120
✅ The correct answer is option B.
2554. Which of the following gasolines (unleaded) has the least octane number ?
Catalytically cracked gasoline
Straight run gasoline
Catalytically reformed gasoline
Polymer gasoline
✅ The correct answer is option B.
2555. Fqra cold viscous feed, backward feed gives __________ than forward feed.
A higher capacity
A lower capacity
Lower economy
None of these
✅ The correct answer is option A.
2556. Heat waves
Can not pass through vacuum
Travel in straight line
Can be reflected by a mirror
Both B and C
✅ The correct answer is option D.
2557. Crude petroleum oil is a __________ fuel.
primary
fossil
both (a) & (b)
secondary
✅ The correct answer is option C.
2558. 1 centistoke is equal to __________ Redwood I seconds.
1
4.08
0.408
40.8
✅ The correct answer is option B.
2559. Nitrogen in coal
Is present upto 1-2%
Comes from protein in parent vegetable matter
Is recovered as ammonia during its carbonisation
All of the above
✅ The correct answer is option D.
2560. In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
In low range of temperature differences
In high range of temperature differences
Because of its low cost
To prevent corrosion of the tube bundles
✅ The correct answer is option B.