1. Closed heaters are __________
a) horizontal
b) vertical
c) inclined
d) depends on the requirement
Ans. d
2. What do you mean by heater drip ?
a) condensate
b) heater failure
c) extract
d) maximum temperature
Ans. a
3. What are the advantages of open heater?
a) lower cost
b) high heat transfer capacity
c) high feedwater temperature
d) all of the mentioned
Ans. d
4. Why at least one open heater is used?
a) installed vertically
b) feedwater deaeration
c) less cost
d) increase efficiency
5. The value of TTD varies with __________
a) heater pressure
b) heater temperature
c) turbine inlet temperature
d) independent of all mentioned
Ans. a
6. Expand TTD ?
a) turbine temperature difference
b) total temperature difference
c) terminal temperature difference
d) turbine terminal difference
Ans. c
7. Closed heaters are also called __________
a) contact type heater
b) shell and heat exchanger
c) drip heaters
d) shell and tube heater
Ans. b
8. In open feedwater heater __________
a) the extracted steam is allowed to mix with feedwater
b) feedwater flows through tubes and steam is condensed outside
c) steam flows outside tubes and feedwater inside
d) steam flows inside tubes and outside inside
Ans. a
9. Feedwater heaters are of two types, they are ____________
a) natural and forced
b) saturated and non saturated
c) open and close
d) water driven and steam driven
Ans. c
10. Why are closed heaters sometimes made vertical?
a) to reduce weight of heaters
b) to reduce floor areas for installations
c) to minimize losses due to weight
d) none of the mentioned
Ans. b
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