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Ammonia Refrigeration Final Exam 2024 Questions With 100% Correct Answers!!
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Ammonia Refrigeration Final Exam 2024 Questions With 100% Correct Answers!!
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Name: Score:177 Multiple choice questions
Term 1 of 177
What conditions are associated with high head pressures?
excessive energy use and compression wear
air, oil, and refrigerant breakdown
compressor suction pressure
it could cause a boil over of the evaporator
Term 2 of 177
An induced draft fan draws air through the ____
compressor
evaporator
condenser
coils
Definition 3 of 177
212°F
T or F: Evaporation takes place as the ammonia refrigerant flows through the compressor
An induced draft fan draws air through the ____
____'s are used to measure the quality of heat energy
100°C equals
,Term 4 of 177
What is specific heat ?
the measure of how acidic or basic a substance is
the temperature at which a substance boils
the rate at which a substance conducts electricity
the amount of heat transferred to change 1 lb of a substance 1°F
Term 5 of 177
What is the Permissible Exposure Limit (PEL) for ammonia?
1000 Ppm
500 PPM
100 Ppm
300 Ppm
Term 6 of 177
Evaporative condensers derive their heat rejection capability from the evaporation of ____
refrigerant
coolant
oil
water
,Term 7 of 177
Where should non-condensables be manually purged?
middle of condenser with condenser running
lowest point of condenser with condenser on
outside the condenser with condenser operating
highest point of condenser with condenser off or isolated
Term 8 of 177
Heat energy always flows from an object at ____
equal temperature to an object at a different temperature
random temperature to an object at a specific temperature
changing from a liquid to a vapor
higher temperature to an object at a lower temperature
Term 9 of 177
What are two dangers of slugging in a compressor?
state
reciprocating, rotary vane, and rotary screw
water
mechanical damage to the compressor and refrigerant loss
, Term 10 of 177
The term bottling refers to refrigerant held in the ____ due to the collapse of refrigerant vapor to
liquid in the condensing process
evaporator
receiver
compressor
condenser
Term 11 of 177
Does manual purging or refrigerated purging lose the least refrigerant?
change the pressure on the liquid
the pressure reduction device and the condenser
refrigerated purging loses the least refrigerant
increased refrigerating effect
Term 12 of 177
What effect does the presence of noncondensible gas have on the power required to produce
refrigeration?
noncondensables improve power efficiency
noncondensables have no effect on power use
the pressure reduction device and the condenser
noncondensables cause an increase in power use
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