EP TYPE 2 EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which of the following statements about recycling and recovery equipment used
for stationary refrigeration is FALSE? - ANS-Purchases of such equipment must be
reported to the EPA.
Refrigerant has been recovered from an air-conditioning system and held in a
refillable cylinder, in order to replace the condenser coil, the refrigerant; - ANS-
May be charged back into the system.
What steps should be taken before using a recovery unit to remove a charge? -
ANS-Service valve positions and recovery oil level should be checked, when
applicable.
Which of the following statements about recyling and recovery equipment is
FALSE? - ANS-Purchases of such equipment must be reported to the EPA
AYou are changing out the compressor of a system containing 40 pounds of R-
404A. In addtion to isolating the compressor, which of the following procedures
should you follow? - ANS-Evacuate the isolated section of the system to 0 psig
and if system pressure does not rise after a few minutes, remove the compressor.
What should be done after reaching the required recovery vacuum on an
appliance? - ANS-Wait for at least a few minutes to see if the system pressure
rises.
Before making a major repair, technicians must evacuate an appliance or
component containing more than 200 pounds of R-410A to which of the following
levels? - ANS-10 inches of Hg vacuum
AWhen can appliances containing refrigerants be recovered to atmosperic
pressure? - ANS-Leaks in the appliance make recovery to the prescribed level
unattainable.
, Which of the following repairs would always be considered "major" under EPA's
regulations? - ANS-Replacement of an evaporator coil
When is it against EPA regulations to use system-dependant recovery equipment?
- ANS-When the appliance contains over 15 pounds of refrigerant.
What is a moisture indicating sight glass useful for? - ANS-Checking for moisture
in refrigerant.
Refrigerant cannot be recovered without isolating a parallel compressor system
because of: - ANS-an open equalization connection.
Which of the following refrigerants would be used in a low-pressure appliance? -
ANS-R-123
It is best practice to use dry nitrogen to break the vacuum when dehydrating by
the triple evacuation method. However, it; - ANS-requires a pressure regulator.
Every refrigerating system must be protected by which of the following? - ANS-A
pressure relief device.
Pressure relief valves can only be installed: - ANS-in parallel.
EPA regulations require that leaking industrial process refrigeration be
repaired(or retrofitted or retired) when the leak rate exceeds; - ANS-30% of the
charge per year.
Where is the rupture disk located on a centrifugal chiller? - ANS-Evaporator
A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate
threshold. Unless granted additional time, what must be completed in 30 days? -
ANS-Repair the appliance so that it leaks below the threshold and conduct the
initial verification test.
Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig
could cause which of the following to fail? - ANS-Rupture disc.
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which of the following statements about recycling and recovery equipment used
for stationary refrigeration is FALSE? - ANS-Purchases of such equipment must be
reported to the EPA.
Refrigerant has been recovered from an air-conditioning system and held in a
refillable cylinder, in order to replace the condenser coil, the refrigerant; - ANS-
May be charged back into the system.
What steps should be taken before using a recovery unit to remove a charge? -
ANS-Service valve positions and recovery oil level should be checked, when
applicable.
Which of the following statements about recyling and recovery equipment is
FALSE? - ANS-Purchases of such equipment must be reported to the EPA
AYou are changing out the compressor of a system containing 40 pounds of R-
404A. In addtion to isolating the compressor, which of the following procedures
should you follow? - ANS-Evacuate the isolated section of the system to 0 psig
and if system pressure does not rise after a few minutes, remove the compressor.
What should be done after reaching the required recovery vacuum on an
appliance? - ANS-Wait for at least a few minutes to see if the system pressure
rises.
Before making a major repair, technicians must evacuate an appliance or
component containing more than 200 pounds of R-410A to which of the following
levels? - ANS-10 inches of Hg vacuum
AWhen can appliances containing refrigerants be recovered to atmosperic
pressure? - ANS-Leaks in the appliance make recovery to the prescribed level
unattainable.
, Which of the following repairs would always be considered "major" under EPA's
regulations? - ANS-Replacement of an evaporator coil
When is it against EPA regulations to use system-dependant recovery equipment?
- ANS-When the appliance contains over 15 pounds of refrigerant.
What is a moisture indicating sight glass useful for? - ANS-Checking for moisture
in refrigerant.
Refrigerant cannot be recovered without isolating a parallel compressor system
because of: - ANS-an open equalization connection.
Which of the following refrigerants would be used in a low-pressure appliance? -
ANS-R-123
It is best practice to use dry nitrogen to break the vacuum when dehydrating by
the triple evacuation method. However, it; - ANS-requires a pressure regulator.
Every refrigerating system must be protected by which of the following? - ANS-A
pressure relief device.
Pressure relief valves can only be installed: - ANS-in parallel.
EPA regulations require that leaking industrial process refrigeration be
repaired(or retrofitted or retired) when the leak rate exceeds; - ANS-30% of the
charge per year.
Where is the rupture disk located on a centrifugal chiller? - ANS-Evaporator
A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate
threshold. Unless granted additional time, what must be completed in 30 days? -
ANS-Repair the appliance so that it leaks below the threshold and conduct the
initial verification test.
Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig
could cause which of the following to fail? - ANS-Rupture disc.
