This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Deaerator – 1”.
1. Deaerator is an ___________
a) closed heater
b) open heater
c) surface heater
d) none of the mentioned
View Answer
Explanation: One of the feedwater heater is a contact type open heater, known as deaerator.
2. What is the purpose of deaerator?
a) to remove the dissolved oxygen and carbon dioxide
b) to remove the dissolved nitrogen
c) to remove the dissolved impurities
d) to supply more oxygen to feedwater
View Answer
Explanation: Purpose of deaerator is to remove the dissolved oxygen and carbon dioxide in water which makes water corrosive.
3. What do you mean by vent condenser?
a) a condensing unit
b) a temperature measuring instrument
c) a heat exchanger
d) dissolves oxygen
View Answer
Explanation: Feedwater is passed through a heat exchanger commonly called as vent condenser.
4. How dissolved oxygen and carbon dioxides are removed?
a) by allowing it to fall from height
b) by series of chemical reactions
c) by condensing feedwater
d) by heating feedwater to saturation temperature
View Answer
Explanation: The solubility of these gases decreases with an increase in temperature.
5. What chemicals are added for residual dissolved oxygen and carbon dioxide?
a) sodium sulphite
b) hydrazine
c) alum
d) all of the mentioned
View Answer
Explanation: Na2SO3 and N2H4 are used to remove residual gasses.
6. Why deaerator is installed at a certain height from the pump?
a) to provide a net positive suction head
b) to maintain less pressure
c) to avoid leakage
d) to maintain pressure
View Answer
Explanation: Deaerator is installed at a certain height from the pump so as to maintain a optimum pressure before suction.
7. Why deaerator is not used in water cooled and moderated nuclear power plant?
a) radioactivity
b) not economical
c) not safe
d) not mechanically possible
View Answer
Explanation: deaerator is not used in water cooled and moderated nuclear power plant because of the concern regarding radioactivity release with deaeration.
8. What is the location of high pressure heaters?
a) after the deaerator
b) before the deaerator
c) middle of deaerator
d) depends on pressure conditions
View Answer
Explanation: The feedwater heaters before the deaerator are often called high pressure heaters(h.p.).
9. What is the location of low pressure heaters?
a) after the deaerator
b) before the deaerator
c) middle of deaerator
d) depends on pressure conditions
View Answer
Explanation: The feedwater heaters after the deaerator are often called low pressure heaters(l.p.).
10. Steam used to heat water comes from?
a) boiler
b) turbine
c) condenser
d) external power source
View Answer
Explanation: Steam from turbine is at high pressure and temperature.
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