Reta Test 1 UPDATED Exam Questions
and CORRECT Answers
what does temperature indicate - CORRECT ANSWER- intensity of heat energy in an object
what is required to move heat from one object to another - CORRECT ANSWER-
temperature difference
which of these is required to obtain a valid reading from a pressure temperature chart -
CORRECT ANSWER- the refrigerant must be in a saturated condition
which of these is an essential component of a mechanical refrigeration system - CORRECT
ANSWER- expansion device
what is a function of a compressor in a mechanical refrigeration system - CORRECT
ANSWER- to accept vapor from the evaporator and compress it to increase its pressure and
temperature
which of these accurately describes subcooled liquid - CORRECT ANSWER- liquid cooled
below at saturation pressure
what does the term compression ratio refer to - CORRECT ANSWER- the ratio of discharge
pressure to suction pressure in PSIA
which refrigerant is more forgiving to moisture in the refrigeration system - CORRECT
ANSWER- R-717
which of these is most likely to occur when air leaks into a refrigeration system - CORRECT
ANSWER- an increase in compressor discharge pressure
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 -
CORRECT ANSWER- rupture of the line if the liquid warms
, under what conditions do halocarbon refrigerants become most hazardous - CORRECT
ANSWER- when did we come in contact with an open flame
which of these conditions is indicated in an ammonia condenser operating with 180 PSIG
pressure at the drain outlet and 90 degrees Fahrenheit liquid temperature leaving the
condenser - CORRECT ANSWER- non condensables in the condenser
What Will Liquid refrigerant trap in a pipe do when heated - CORRECT ANSWER- expand
which industrial compressor would be direct drive at 3600 RPM - CORRECT ANSWER-
screw compressor
why is the discharge temperature of a screw compressor lower than the discharge temperature
of a reciprocating compressor - CORRECT ANSWER- significant quantities of oil flow into
the rotor section of a screw compressor
how does the intercooler help the low stage compressor and high stage compressor -
CORRECT ANSWER- by d superheating low stage compressor discharge temperature
which of these is the primary responsibility of a refrigeration system operator - CORRECT
ANSWER- to track system operations in logs and maintenance records
which of these functions are required by the operator to complete logs properly - CORRECT
ANSWER- Monitor and record system temperatures, pressures levels and product
temperatures.
which of these should be done first when a reciprocating compressor starts to pound or makes
an unusual loud noise. - CORRECT ANSWER- turn off the compressor.
which of these most accurately describes when hydraulic pounding in a reciprocating
compressor is taking place. - CORRECT ANSWER- when liquid refrigerant enters the
compression chamber.
and CORRECT Answers
what does temperature indicate - CORRECT ANSWER- intensity of heat energy in an object
what is required to move heat from one object to another - CORRECT ANSWER-
temperature difference
which of these is required to obtain a valid reading from a pressure temperature chart -
CORRECT ANSWER- the refrigerant must be in a saturated condition
which of these is an essential component of a mechanical refrigeration system - CORRECT
ANSWER- expansion device
what is a function of a compressor in a mechanical refrigeration system - CORRECT
ANSWER- to accept vapor from the evaporator and compress it to increase its pressure and
temperature
which of these accurately describes subcooled liquid - CORRECT ANSWER- liquid cooled
below at saturation pressure
what does the term compression ratio refer to - CORRECT ANSWER- the ratio of discharge
pressure to suction pressure in PSIA
which refrigerant is more forgiving to moisture in the refrigeration system - CORRECT
ANSWER- R-717
which of these is most likely to occur when air leaks into a refrigeration system - CORRECT
ANSWER- an increase in compressor discharge pressure
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 -
CORRECT ANSWER- rupture of the line if the liquid warms
, under what conditions do halocarbon refrigerants become most hazardous - CORRECT
ANSWER- when did we come in contact with an open flame
which of these conditions is indicated in an ammonia condenser operating with 180 PSIG
pressure at the drain outlet and 90 degrees Fahrenheit liquid temperature leaving the
condenser - CORRECT ANSWER- non condensables in the condenser
What Will Liquid refrigerant trap in a pipe do when heated - CORRECT ANSWER- expand
which industrial compressor would be direct drive at 3600 RPM - CORRECT ANSWER-
screw compressor
why is the discharge temperature of a screw compressor lower than the discharge temperature
of a reciprocating compressor - CORRECT ANSWER- significant quantities of oil flow into
the rotor section of a screw compressor
how does the intercooler help the low stage compressor and high stage compressor -
CORRECT ANSWER- by d superheating low stage compressor discharge temperature
which of these is the primary responsibility of a refrigeration system operator - CORRECT
ANSWER- to track system operations in logs and maintenance records
which of these functions are required by the operator to complete logs properly - CORRECT
ANSWER- Monitor and record system temperatures, pressures levels and product
temperatures.
which of these should be done first when a reciprocating compressor starts to pound or makes
an unusual loud noise. - CORRECT ANSWER- turn off the compressor.
which of these most accurately describes when hydraulic pounding in a reciprocating
compressor is taking place. - CORRECT ANSWER- when liquid refrigerant enters the
compression chamber.
