CFESA REFRIGERATION
CERTIFICATION TEST
1 . How do you check the suction valves on a compressor ? -
ANSWERS-front seat the service valve , run the compressor and see
if the compressor pulls down into a deep vacuum
2 . To check the discharge valves on a compressor : - ANSWERS-D.
front seat the suction service valve and pump the compressor into a
vacuum and shut off the compressor . The suction pressure should
remain the same .
3 . A bleed resistor is needed on a start capacitor because : -
ANSWERS-it prevents the capacitor from discharging across the
relay contacts causing them to burn
4 . Two 100 uf capacitors connected in parallel have a total
capacitance of : - ANSWERS-200 uf
5 . A major problem with POE oil is : - ANSWERS-it absorbs
moisture from the air very quickly
6 . When using the newer refrigerants always install driers for field
replacements that are - ANSWERS-one size larger than the size of the
drier used for the older refrigerant
,7 . The most effective place to remove moisture from refrigerant is in
: ( worth 5 points ) - ANSWERS-The liquid line
8 . The most effective place to remove acid from a system is in : (
worth 5 points ) - ANSWERS-The suction line
9 . A compressor burn out : ( worth 5 points ) - ANSWERS-A. will
read a resistance short from the terminals to ground
C. will require new refrigerant an oversized liquid line drier , a
suction line drier
10 . Most replacement compressors fail again prematurely because : -
ANSWERS-the cause of the original failure was not found and cured
11 . A fan delay thermostat is used on commercial freezers to : -
ANSWERS-B prevent the evaporator fans from blowing out hot air
C prevent the evaporator fans from blowing water droplets into the
box
12 . Dirty and clogged evaporator coils will result in : - ANSWERS-
A. Icing of the evaporator coil
B. Slugging of the compressor
13 . Icing around a freezer door frame may indicate : - ANSWERS-
An open circuit in the door frame heater
, 14 E.xcessive moisture in a reach in cooler indicates - ANSWERS-A
possible clogged evaporator drain pan
15 . Many commercial reach in boxes are designed with which line
running through the condensate evaporation pan to provide the heat to
evaporate the condensate - ANSWERS-The discharge line
16 . Most evaporator failures in reach in coolers are due to -
ANSWERS-Corrosion from certain acetic foods like cole slaw .
17 . A pump down solenoid valve is located in the : - ANSWERS-
Liquid line
18 . Most capillary failure ( partial or complete ) clogging is usually a
result of : - ANSWERS-Poor preventive maintenance resulting is
excessive head pressure
19 . Most leaks in the middle of a copper line are due to : -
ANSWERS-Lines vibrating against each other or a fixed surface
cooler units in lower 110 . Pressure controls cannot be used as a sole
source of temperature control on outdoor temperature climates
because the temperature may keep the pressure from rising enough to
trigger the control back on . In low temperature climates it is most
efficient to have : - ANSWERS-A pump down cycle
CERTIFICATION TEST
1 . How do you check the suction valves on a compressor ? -
ANSWERS-front seat the service valve , run the compressor and see
if the compressor pulls down into a deep vacuum
2 . To check the discharge valves on a compressor : - ANSWERS-D.
front seat the suction service valve and pump the compressor into a
vacuum and shut off the compressor . The suction pressure should
remain the same .
3 . A bleed resistor is needed on a start capacitor because : -
ANSWERS-it prevents the capacitor from discharging across the
relay contacts causing them to burn
4 . Two 100 uf capacitors connected in parallel have a total
capacitance of : - ANSWERS-200 uf
5 . A major problem with POE oil is : - ANSWERS-it absorbs
moisture from the air very quickly
6 . When using the newer refrigerants always install driers for field
replacements that are - ANSWERS-one size larger than the size of the
drier used for the older refrigerant
,7 . The most effective place to remove moisture from refrigerant is in
: ( worth 5 points ) - ANSWERS-The liquid line
8 . The most effective place to remove acid from a system is in : (
worth 5 points ) - ANSWERS-The suction line
9 . A compressor burn out : ( worth 5 points ) - ANSWERS-A. will
read a resistance short from the terminals to ground
C. will require new refrigerant an oversized liquid line drier , a
suction line drier
10 . Most replacement compressors fail again prematurely because : -
ANSWERS-the cause of the original failure was not found and cured
11 . A fan delay thermostat is used on commercial freezers to : -
ANSWERS-B prevent the evaporator fans from blowing out hot air
C prevent the evaporator fans from blowing water droplets into the
box
12 . Dirty and clogged evaporator coils will result in : - ANSWERS-
A. Icing of the evaporator coil
B. Slugging of the compressor
13 . Icing around a freezer door frame may indicate : - ANSWERS-
An open circuit in the door frame heater
, 14 E.xcessive moisture in a reach in cooler indicates - ANSWERS-A
possible clogged evaporator drain pan
15 . Many commercial reach in boxes are designed with which line
running through the condensate evaporation pan to provide the heat to
evaporate the condensate - ANSWERS-The discharge line
16 . Most evaporator failures in reach in coolers are due to -
ANSWERS-Corrosion from certain acetic foods like cole slaw .
17 . A pump down solenoid valve is located in the : - ANSWERS-
Liquid line
18 . Most capillary failure ( partial or complete ) clogging is usually a
result of : - ANSWERS-Poor preventive maintenance resulting is
excessive head pressure
19 . Most leaks in the middle of a copper line are due to : -
ANSWERS-Lines vibrating against each other or a fixed surface
cooler units in lower 110 . Pressure controls cannot be used as a sole
source of temperature control on outdoor temperature climates
because the temperature may keep the pressure from rising enough to
trigger the control back on . In low temperature climates it is most
efficient to have : - ANSWERS-A pump down cycle
