Mass Transfer aptitude tests on “Reboiler & Condenser Selection for Fractionator “.
1. Which of the following reboiler is considering as an additional tray?
a) Jacketed kettle
b) Internal reboiler
c) Kettle-reboiler
d) None of the mentioned
Answer: c
Clarification: Kettle boiler is the external boiler considered as an additional tray.
2. The internal reboilers are preferred for maintaining the economy of an industry.
a) True
b) False
Answer: b
Clarification: The internal reboilers need shutting down of distillation column for cleaning.
3. The vertical-syphon reboilers are not preferred because of
a) Fouling
b) Overheat
c) Large tubes
d) None of the mentioned
Answer: a
Clarification: Vertical-syphon has inside tubes fouls frequently.
4. Jacketed kettle is preferred for kettle type reboiler.
a) True
b) False
Answer: b
Clarification: Jacketed kettle needs fractionator shut down and has low heat transfer area.
5. The reboiler which is most preferred is
a) External
b) Internal
c) Middle
d) All of the mentioned
Answer: a
Clarification: External reboiler can easily replace and no need for shutting down of fractionator.
6. Find the condenser location.
a) X
b) Y
c) Z
d) No condenser
Answer: a
Clarification: Condenser is used to condense the high volatile vapour gas to liquid so it must present at the top.
7. Condenser or reboiler is consider as a trays or stage in a fractionator.
a) True
b) False
Answer: a
Clarification: Some separated units are present in condenser or reboiler so it also included in a number of trays.
8. The fuel fired furnace is preferred for high boiling point.
a) True
b) False
Answer: a
Clarification: The low volatile (high boiling point) components need more heat. So fuel fired furnace is preferred.
9. Will this arrangement is possible and effective.
a) True
b) False
Answer: b
Clarification: NO distillate forms. NO separation occurs. Since the more volatile component and low volatile component remains similar to feed condition.
10. Most reboilers are
a) Heat regulators
b) Heat exchangers
c) Heat analyser
d) Heat rectifiers
Answer: b
Clarification: Stream is economical for heat production so heat exchangers are preferred. Heat exchangers are easy to handle and replace.
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