USCG Test #1 with all Correct & 100% Verified Answers |
Latest Version |Already Graded A+
A refrigerant used in a mechanical refrigeration system should have which of the following
characteristics?
a) High boiling point
b) High freezing point
c) Low specific heat
d) Low boiling point ✔Correct Answer-D
For safe storage, the maximum allowable temperature to which refrigerant bottles should be
exposed is ______.
a) 100°F
b) 125°F
c) 150°F
d) 175°F ✔Correct Answer-B
Inhalation of high concentrations of CFCs may have which of the following effects?
a) drowsiness
b) loss of concentration
c) cardiac arrhythmia's
d) all of the above ✔Correct Answer-D
Some chlorinated fluorocarbon refrigerants may decompose into a toxic irritating gas if it is
______.
a) stored at temperatures below 60 degrees Fahrenheit
b) charged into a system having copper fittings
c) allowed to mix with compressor oil
d) exposed to an open flame or hot surface ✔Correct Answer-D
In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants
decomposes and form ______.
a) petroleum crystals
b) phosgene gas
c) water vapor
d) carbon monoxide ✔Correct Answer-B
People familiar with ammonia refrigeration systems become accustomed to its odor and may
forget that the vapors ______.
a) in a low concentration can cause death
b) will dissolve in perspiration and cause caustic burns
c) will burn or explode
Latest Version |Already Graded A+
A refrigerant used in a mechanical refrigeration system should have which of the following
characteristics?
a) High boiling point
b) High freezing point
c) Low specific heat
d) Low boiling point ✔Correct Answer-D
For safe storage, the maximum allowable temperature to which refrigerant bottles should be
exposed is ______.
a) 100°F
b) 125°F
c) 150°F
d) 175°F ✔Correct Answer-B
Inhalation of high concentrations of CFCs may have which of the following effects?
a) drowsiness
b) loss of concentration
c) cardiac arrhythmia's
d) all of the above ✔Correct Answer-D
Some chlorinated fluorocarbon refrigerants may decompose into a toxic irritating gas if it is
______.
a) stored at temperatures below 60 degrees Fahrenheit
b) charged into a system having copper fittings
c) allowed to mix with compressor oil
d) exposed to an open flame or hot surface ✔Correct Answer-D
In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants
decomposes and form ______.
a) petroleum crystals
b) phosgene gas
c) water vapor
d) carbon monoxide ✔Correct Answer-B
People familiar with ammonia refrigeration systems become accustomed to its odor and may
forget that the vapors ______.
a) in a low concentration can cause death
b) will dissolve in perspiration and cause caustic burns
c) will burn or explode
