GCAP INDUSTRIAL AMMONIA REFRIGERATION ACTUAL
EXAM GUIDE STUDY QUESTIONS AND ANSWERS SURE
A+
✔✔In a baffled shell and tube heat exchanger - ✔✔Ammonia refrigerant flows through
the tubes
✔✔For each pound of water evaporated, an evaporative condenser rejects - ✔✔970 to
1057 BTUs
✔✔What kind of fan pushes air through coils - ✔✔Forced
✔✔If the power element of a thermostatic expansion valve and lost its charge the result
would be - ✔✔He starved evaporator
✔✔In a two-stage ammonia refrigeration system, which compressor should commonly
be started first - ✔✔The highside compressor
✔✔A surge drum of a flood system is used to - ✔✔Separate the vapor from the liquid for
the suction guess that returns to the compressor, except the flash gas from the make up
liquid.
✔✔In an ammonia let it evaporate or, oil could gather in the evaporator at the lowest
point, because? - ✔✔Oil is heavier in it has a higher boiling point than ammonia
✔✔What can happen when you isolate a pipe or vessel that is almost 100° full of liquid
refrigerant? - ✔✔If it has a relief valve, the valve may open to relieve overpressure from
exhorting heat with no room for expansion. A rupture may occur due to a hydrostatic
condition if the ammonia is orbs enough heat, if an explosion situation occurs you could
have a major emergency on your hands, plus possible injuries or fatalities
✔✔Heat flowing through a copper bar with one end in a fire is an example of heat flow
by - ✔✔Conduction
✔✔A cold storage room is 150 feet long by 80 feet wide by 35 feet high what is the
volume of this room - ✔✔150 x 80 x35 =420,000 cubic feet
✔✔If an ammonia receiver will hold 1000 pounds of liquid and 90°F went completely
filled, the mass capacity is for this receiver is - ✔✔800 pounds
✔✔What condition, which can be monitored in the engine room, indicates evaporator
temperature - ✔✔Suction pressure
, ✔✔It back pressure regulator is - ✔✔A pressure controller
✔✔To check a leak in ammonia piping system typically you use - ✔✔A sulfer stick or pH
paper
✔✔What is the common cause of liquid slop over in ammonia refrigeration system -
✔✔Overfeeding the liquid to a DX evaporator, a solenoid valve leaking to the make up
line, too great of a heat load on the evaporator too fast thermal shock
✔✔The pressure/temperature relationship for ammonia, obtain from a PT
pressure/temperature chart, is only valid when the ammonia in the section you are
metering is - ✔✔In a saturated condition
✔✔When using a screw compressor with an oil separator a heater should - ✔✔Shut on
and off as needed according to the oil temperature set point
✔✔An ammonia liquid line has liquid trapped and it's temperature is starting to rise how
much will the PSIG pressure rise for every 1°F of heat exposure? Hydrostatic pressure
increase - ✔✔100 to 150 pounds PSIG
✔✔Ammonia is on the EPA toxic chemical list - ✔✔True
✔✔A high-pressure cut out switch - ✔✔Should never be jumped
✔✔How are temperature and heat related - ✔✔Temperature is a measure of the
intensity of the heat in an object
✔✔What causes liquid SluggIng - ✔✔The compressor drawing in lubricating oil from the
suction line, the compressor drawing in liquid ammonia from the suction line, a rapid
lowering of suction pressure at the compressor, drawing in lubrication oil or ammonia.
✔✔What must the operating engineer do in the event of liquid slugging - ✔✔Shut off the
compressor.
✔✔Where should you manually purge the noncondensibles from your system - ✔✔From
the highest point of the condenser, with the compressor off, or the condenser isolated
✔✔What is the principle of manage and disadvantage of ammonia as a refrigerant -
✔✔It is readily available but it is toxic
✔✔What is the difference between a unit cooler and a blast freezer - ✔✔Unit colors are
not installed and freezers, air velocity, more tonnage of equipment per square foot
EXAM GUIDE STUDY QUESTIONS AND ANSWERS SURE
A+
✔✔In a baffled shell and tube heat exchanger - ✔✔Ammonia refrigerant flows through
the tubes
✔✔For each pound of water evaporated, an evaporative condenser rejects - ✔✔970 to
1057 BTUs
✔✔What kind of fan pushes air through coils - ✔✔Forced
✔✔If the power element of a thermostatic expansion valve and lost its charge the result
would be - ✔✔He starved evaporator
✔✔In a two-stage ammonia refrigeration system, which compressor should commonly
be started first - ✔✔The highside compressor
✔✔A surge drum of a flood system is used to - ✔✔Separate the vapor from the liquid for
the suction guess that returns to the compressor, except the flash gas from the make up
liquid.
✔✔In an ammonia let it evaporate or, oil could gather in the evaporator at the lowest
point, because? - ✔✔Oil is heavier in it has a higher boiling point than ammonia
✔✔What can happen when you isolate a pipe or vessel that is almost 100° full of liquid
refrigerant? - ✔✔If it has a relief valve, the valve may open to relieve overpressure from
exhorting heat with no room for expansion. A rupture may occur due to a hydrostatic
condition if the ammonia is orbs enough heat, if an explosion situation occurs you could
have a major emergency on your hands, plus possible injuries or fatalities
✔✔Heat flowing through a copper bar with one end in a fire is an example of heat flow
by - ✔✔Conduction
✔✔A cold storage room is 150 feet long by 80 feet wide by 35 feet high what is the
volume of this room - ✔✔150 x 80 x35 =420,000 cubic feet
✔✔If an ammonia receiver will hold 1000 pounds of liquid and 90°F went completely
filled, the mass capacity is for this receiver is - ✔✔800 pounds
✔✔What condition, which can be monitored in the engine room, indicates evaporator
temperature - ✔✔Suction pressure
, ✔✔It back pressure regulator is - ✔✔A pressure controller
✔✔To check a leak in ammonia piping system typically you use - ✔✔A sulfer stick or pH
paper
✔✔What is the common cause of liquid slop over in ammonia refrigeration system -
✔✔Overfeeding the liquid to a DX evaporator, a solenoid valve leaking to the make up
line, too great of a heat load on the evaporator too fast thermal shock
✔✔The pressure/temperature relationship for ammonia, obtain from a PT
pressure/temperature chart, is only valid when the ammonia in the section you are
metering is - ✔✔In a saturated condition
✔✔When using a screw compressor with an oil separator a heater should - ✔✔Shut on
and off as needed according to the oil temperature set point
✔✔An ammonia liquid line has liquid trapped and it's temperature is starting to rise how
much will the PSIG pressure rise for every 1°F of heat exposure? Hydrostatic pressure
increase - ✔✔100 to 150 pounds PSIG
✔✔Ammonia is on the EPA toxic chemical list - ✔✔True
✔✔A high-pressure cut out switch - ✔✔Should never be jumped
✔✔How are temperature and heat related - ✔✔Temperature is a measure of the
intensity of the heat in an object
✔✔What causes liquid SluggIng - ✔✔The compressor drawing in lubricating oil from the
suction line, the compressor drawing in liquid ammonia from the suction line, a rapid
lowering of suction pressure at the compressor, drawing in lubrication oil or ammonia.
✔✔What must the operating engineer do in the event of liquid slugging - ✔✔Shut off the
compressor.
✔✔Where should you manually purge the noncondensibles from your system - ✔✔From
the highest point of the condenser, with the compressor off, or the condenser isolated
✔✔What is the principle of manage and disadvantage of ammonia as a refrigerant -
✔✔It is readily available but it is toxic
✔✔What is the difference between a unit cooler and a blast freezer - ✔✔Unit colors are
not installed and freezers, air velocity, more tonnage of equipment per square foot
