Power Engineering Chapter 124
Showing posts with label Power Engineering Chapter 124. Show all posts
Showing posts with label Power Engineering Chapter 124. Show all posts

The automatic purge system does not require?

The automatic purge system does not require?





a. Vacuum pump
b. Suction chamber
c. Return chamber
d. Storage chamber
e. A and D






Answer: A

Which of the following are elements of a mechanical purging system? i) purge pickup tube ii) purge chamber iii) manual shutoff valve iv) safety solenoid valve v) oil trap vi) vacuum pump

Which of the following are elements of a mechanical purging system?
i) purge pickup tube
ii) purge chamber
iii) manual shutoff valve
iv) safety solenoid valve
v) oil trap
vi) vacuum pump



a) i and ii only
b) i, ii, and v only
c) iv and vi only
d) i, iii, and v only
e) all of the elements






Answer: E

Concentration of the Lithium Bromide can be most easily controlled by which of the following means?

Concentration of the Lithium Bromide can be most easily controlled by which of the following means?





a) Controlling the volume of water sprayed into the absorber.
b) Controlling the temperature in the cooling tower.
c) Controlling the amount of weak Lithium Bromide pumped into the generator.
d) Controlling the pressure in the vacuum between the evaporator and the absorber.
e) Controlling the temperature in the generator.







Answer: E

In a closed tank that is partially filled with a salt solution at a temperature well below the boiling point of the solution:

In a closed tank that is partially filled with a salt solution at a temperature well below the boiling point of the solution:




a. Some molecules of water vapour will actually escape from the solution
b. There will be a steady stream of water vapour molecules leaving and entering the solution
c. No molecules of water vapour will be able escape from the solution
d. No molecules of water vapour will be absorbed back into the solution
e. Some molecules of water vapour will actually be absorbed back into the solution








Answer: B

During seasonal start-up, when should the purge pump be started?

During seasonal start-up, when should the purge pump be started?




a. Simultaneously with the absorption unit
b. One half hour before the absorption unit is started
c. At least 24 hours after the compressor is started
d. About one half hour after the absorption unit is started
e. Only when non-condensable gases are detected in the system





Answer: D

In a closed tank the salt solution is said to be in equilibrium

In a closed tank the salt solution is said to be in equilibrium





a. when the ratio of water and salt does not change
b. just before crystallization occurs
c. when the solution is saturated
d. when the salt precipitates
e. when the ratio of water in the solution increases







Answer: A

When the temperature of a solution increases, which of the following statements is true?

When the temperature of a solution increases, which of the following statements is true?





a. The vapour pressure above the solution increases
b. Less water molecules leave the solution
c. The solubility of the salt decreases
d. The concentration of the solution decreases
e. The equilibrium constant decreases






Answer: A

Octal alcohol is added to the lithium bromide solution to:

Octal alcohol is added to the lithium bromide solution to:






a. Act as a drying agent
b. Act as a wetting agent
c. Prevent crystallization
d. Help the lithium bromide solution absorb non-condensables
e. Act as a dispersing agent





Answer: B

When the temperature of a strong but still unsaturated lithium bromide solution is lowered so far that its salt concentration exceeds the maximum concentration possible at the lower temperature, ________________ will occur.

When the temperature of a strong but still unsaturated lithium bromide solution is lowered so far that its salt concentration exceeds the maximum concentration possible at the lower temperature, ________________ will occur.



a. Fractionation
b. Distillation
c. Crystallization
d. Vaporization
e. Neutralization






Answer: C
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