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COMMERCIAL SYSTEMS

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
What is commonly used to produce flake ice?
a.
electrical grids
c.
scraper on evaporator
b.
compression of ice
d.
Auger
 

 2. 
In a hot gas defrost system, which parts of the system are heated?
a.
Condenser
c.
Evaporator
b.
Drain Pan
d.
Both A & C
 

 3. 
What type of metal is used in an all metal pressure evaporator?
a.
Copper and cast aluminum
c.
Copper and Bronze
b.
Copper and cast iron
d.
Copper
 

 4. 
What is counterflow principle?
a.
Refrigerant passes in the opposite direction of the water
c.
The condenser uses a counterflow fan
b.
Refrigerant flows in the opposite direction of the water
d.
Refrigerant flows in the same direction of the water
 

 5. 
Why do liquid receivers have safety devices?
a.
To provide pressure release
c.
To provide a safety release
b.
To provide a thermal release
d.
All of the above
 

 6. 
What does the inner tube of a tube within a tube contain?
a.
Refrigerant
c.
Nitrogen
b.
Water
d.
Any of the above
 

 7. 
What is the advantage of forced circulation evaporators?
a.
They cool the cabinet quickly
c.
They take up little space
b.
They do not require baffles
d.
All of the above
 

 8. 
An evaporative condenser operates as follows:
a.
Water is sprayed onto the condenser
c.
Heat from the evaporator is absorbed
b.
Air is blow across the condenser
d.
All of the above
 

 9. 
What is the advantage of a water cooled condenser?
a.
It has lower operating head pressure
c.
It reduces wear and tear on the system’s moving parts
b.
It provides greater system capacity
d.
All of the above
 

 10. 
What is the advantage of an air-cooled condenser?
a.
It has lower operational costs
c.
It may be used where suffcient air is available
b.
It is easliy installed
d.
All of the above
 



 
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