In a two stage, duplex compressor refrigeration system, the condenser for the first stage is the ______ for the second stage.
Eliminator
Purger
Receiver
Evaporator
Liquid cooler
The major components of a high-pressure ammonia system are:
Compressor, condenser, oil purifier, high-pressure cutout, evaporator
Compressor, condenser, expansion valve, high-pressure cutout, evaporator
Compressor, condenser, expansion valve, oil purifier, evaporator
Compressor, condenser, expansion valve, high-pressure cutout, expansion valve
Compressor, condenser, expansion valve, liquid receiver, evaporator
A/An _____ is usually provided between the low-pressure discharge and high-pressure suction of a multi-stage refrigeration system.
Condenser
Intercooler
The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are:
1030 kPa and atmospheric pressure
30deg c condensing and -15 deg c evaporating
30 kPa and atmospheric pressure
-30deg C condensing and 15 deg c evaporating
30 kPa and atmospheric temperature
A reciprocating refrigerant compressor may have both a/an ______ and a/an ______.
Magnetic plug, integral air reciever
Reverse osmosis membrane, emergency connecting rod
Oil foam breaker, magnetic plug
Oil foam plug, magnetic foam breaker
Teflon drive coupling, reverse RPM indicator
There are _____ basic elements common to most compression refrigeration systems.
2
3
4
5
6
Most modern refrigeration systems make use of the principle of absorbing heat by:
Condensing refrigerant at low pressure
High evaporating pressures
The evaporation of a liquid, and then discarding the heat to the atmosphere
Evaporation of brine
High condensing temperature and pressure
The difference in enthalpy of ammonia as a fluid at saturation conditions at 1165.8 kPa abs and 236.2 kPa abs is found in the:
hf column and is 208.9kJ/kg
hf and hg columns and is 1311.6 kJ/kg
hf column and is 114.905 kJ/kg
hf column and is 0.508788 kJ/kg
hg column and is 658.519 kJ/kg
The liquid receiver in a refrigeration system is a/an:
Oil storage unit
Storage vessel for liquid brine
Contaminated liquid storage tank
Surge vessel for refrigerant
Pressure vessel
In a two-stage refrigeration system, the 1st stage compressor is also known as a _____ compressor.
Booster
Standby
Low volume
Extraction
Refrigerant
