HVAC EPA Exam – Core Questions and
Answers6
measuring a systems vacuum should be done with the system - ANSWERS -isolated and the
vacuum pump turned off
a system that will not hold a vacuum probably - ANSWERS -has a leak
disposable cylinders are used only with _____ refrigerant and may NEVER be used for
_________ - ANSWERS -virgin; recovery
refrigerants must not be filled above __% of its capacity weight - ANSWERS -80%
when leak checking a system, NEVER pressurize the system with - ANSWERS -oxygen or
compressed air
when using recovery cylinders and equipment with Schrader valves, - ANSWERS -inspect the
Schrader valve core for leaks, bends and breakages
An ozone molecule consists of - ANSWERS -3 oxygen atoms
Depletion of Ozone in the stratosphere causes: - ANSWERS -1. Crop loss
2. Increase in eye disease
3. Skin cancer
4. Reduced marine life
5. Deforestation
, 6. Increased ground level ozone
When released into the atmosphere deplete the Ozone layer - ANSWERS -CFC and HFC
What happens when a chlorine atom meets with an Ozone molecule? - ANSWERS -it takes 1
oxygen atom away from the Ozone, forming Chlorine Monoxide
___ chlorine atom can destroy ________ ozone molecules - ANSWERS -one chlorine; 100,000
Ozone molecules
the chlorine in CFC's will neither dissolve in water nor - ANSWERS -break down into compounds
that dissolve in water
measurement of CFC's and HCFC's ability to destroy ozone is - ANSWERS -Ozone Depletion
Potential
the compound gauge (blue) and the high pressure gauge (red) are connected to the manifold -
ANSWERS -the manifold is connected by hoses to access ports to measure system pressures
EPA regulations require that hoses be equipped with - ANSWERS -low loss fittings that will
minimize refrigerant loss when hoses are disconnected
(1) the metering device causes a reduction in pressure, and therefore.. - ANSWERS -a reduction
in saturation temperature
(2) Heat is absorbed in the evaporator and causes the refrigerator to - ANSWERS -boil from
liquid to vapor
Answers6
measuring a systems vacuum should be done with the system - ANSWERS -isolated and the
vacuum pump turned off
a system that will not hold a vacuum probably - ANSWERS -has a leak
disposable cylinders are used only with _____ refrigerant and may NEVER be used for
_________ - ANSWERS -virgin; recovery
refrigerants must not be filled above __% of its capacity weight - ANSWERS -80%
when leak checking a system, NEVER pressurize the system with - ANSWERS -oxygen or
compressed air
when using recovery cylinders and equipment with Schrader valves, - ANSWERS -inspect the
Schrader valve core for leaks, bends and breakages
An ozone molecule consists of - ANSWERS -3 oxygen atoms
Depletion of Ozone in the stratosphere causes: - ANSWERS -1. Crop loss
2. Increase in eye disease
3. Skin cancer
4. Reduced marine life
5. Deforestation
, 6. Increased ground level ozone
When released into the atmosphere deplete the Ozone layer - ANSWERS -CFC and HFC
What happens when a chlorine atom meets with an Ozone molecule? - ANSWERS -it takes 1
oxygen atom away from the Ozone, forming Chlorine Monoxide
___ chlorine atom can destroy ________ ozone molecules - ANSWERS -one chlorine; 100,000
Ozone molecules
the chlorine in CFC's will neither dissolve in water nor - ANSWERS -break down into compounds
that dissolve in water
measurement of CFC's and HCFC's ability to destroy ozone is - ANSWERS -Ozone Depletion
Potential
the compound gauge (blue) and the high pressure gauge (red) are connected to the manifold -
ANSWERS -the manifold is connected by hoses to access ports to measure system pressures
EPA regulations require that hoses be equipped with - ANSWERS -low loss fittings that will
minimize refrigerant loss when hoses are disconnected
(1) the metering device causes a reduction in pressure, and therefore.. - ANSWERS -a reduction
in saturation temperature
(2) Heat is absorbed in the evaporator and causes the refrigerator to - ANSWERS -boil from
liquid to vapor
