Reta Test 1
1. what does temperature indicate: intensity of heat energy in an object
2. what is required to move heat from one object to another:
temperature difference
3. which of these is required to obtain a valid reading from a
pressure temperature chart: the refrigerant must be in a saturated
condition
4. which of these is an essential component of a mechanical
refrigeration system: expansion device
5. what is a function of a compressor in a mechanical refrigeration system:
to accept vapor from the evaporator and compress it to increase its
pressure and temperature
6. which of these accurately describes subcooled liquid: liquid cooled
below at saturation pressure
7. what does the term compression ratio refer to: the ratio of discharge
pres- sure to suction pressure in PSIA
8. which refrigerant is more forgiving to moisture in the refrigeration
1/4
, system-
: R-717
9. which of these is most likely to occur when air leaks into a
refrigeration system: an increase in compressor discharge pressure
10.which of these is the greatest risk from closing valves on each end of a
liquid line between a liquid pump and an evaporator during maintenance
of an ammonia refrigeration system: rupture of the line if the liquid
warms
11.under what conditions do halocarbon refrigerants become most haz-
ardous: when did we come in contact with an open flame
12.which of these conditions is indicated in an ammonia condenser
operat- ing with 180 PSIG pressure at the drain outlet and 90 degrees
Fahrenheit liquid temperature leaving the condenser: non condensables
in the condenser
13.What Will Liquid refrigerant trap in a pipe do when heated: expand
14.which industrial compressor would be direct drive at 3600 RPM:
screw compressor
15.why is the discharge temperature of a screw compressor lower than the
2/4
1. what does temperature indicate: intensity of heat energy in an object
2. what is required to move heat from one object to another:
temperature difference
3. which of these is required to obtain a valid reading from a
pressure temperature chart: the refrigerant must be in a saturated
condition
4. which of these is an essential component of a mechanical
refrigeration system: expansion device
5. what is a function of a compressor in a mechanical refrigeration system:
to accept vapor from the evaporator and compress it to increase its
pressure and temperature
6. which of these accurately describes subcooled liquid: liquid cooled
below at saturation pressure
7. what does the term compression ratio refer to: the ratio of discharge
pres- sure to suction pressure in PSIA
8. which refrigerant is more forgiving to moisture in the refrigeration
1/4
, system-
: R-717
9. which of these is most likely to occur when air leaks into a
refrigeration system: an increase in compressor discharge pressure
10.which of these is the greatest risk from closing valves on each end of a
liquid line between a liquid pump and an evaporator during maintenance
of an ammonia refrigeration system: rupture of the line if the liquid
warms
11.under what conditions do halocarbon refrigerants become most haz-
ardous: when did we come in contact with an open flame
12.which of these conditions is indicated in an ammonia condenser
operat- ing with 180 PSIG pressure at the drain outlet and 90 degrees
Fahrenheit liquid temperature leaving the condenser: non condensables
in the condenser
13.What Will Liquid refrigerant trap in a pipe do when heated: expand
14.which industrial compressor would be direct drive at 3600 RPM:
screw compressor
15.why is the discharge temperature of a screw compressor lower than the
2/4
