Which of the following properties would a good quality refrigerant oil include?
Non-corrosive and harmless quality to metals
Which of the following properties should refrigerating oil have?
1. No moisture content.
2. No wax content.
3. A high flash point.
How many kinds of lubricating oil are used in a horizontal double acting compressor
Two
What percentage of oil travels through the refrigerant system white it is operating?
10%
In a Freon compression system, a practical way to check for oil carry-over into the refrigerant circuit is to?
Spray refrigerant from the bottom of the receiver onto a piece of bond paper, then inspect the paper for an oil stain
What function does the oil lantern perform inside of a stuffing box type seal?
Act as a spacer to hold oil
A two cylinder, vertical, single stage compressor is equipped with a gear type oil pump. For good performance of this equipment, the oil discharge pressure should range approximately from?
10 to 30 psi above the suction pressure
The term viscosity refers to what property of refrigerant oil?
Internal friction
Oil foaming in the crankcase of a compressor is caused by?
A sudden drop in crankcase pressure.
A new compressor has just been installed in a refrigeration plant? What amount of oil should be charged into it?
Slightly more than normal
At what location in the refrigeration cycle should the oil separator be installed?
In the discharge line as far away from the compressor as possible.
It has been determined that the oil level in a particular refrigeration system is low. By which of the following methods should additional oil be charged into the system?
Pumping it into the compressor crankcase.
Which of the following statements regarding the flashpoint of refrigerant oil is most correct?
Should take place at a temperature which is higher than the compressor discharge temperature.
Of the following, the primary reason for the installation of a crankcase breather line is?
To allow refrigerant to return to the compressor suction
A refrigeration system has a reciprocating compressor. When is the oil heater energized?
As the compressor cycles off.
Which type of lubrication system is recommended for use on smaller capacity systems, but is usually unsatisfactory for modern high speed reciprocating compressors?
Splash type system.
If paraffin based oil was to foul an evaporator, how would you remove the wax?
Heating up the coil and pumping it out.
If an operator erroneously charged a refrigeration system with a paraffin based oil, how would it affect the system?
The evaporator would become fouled with wax.
When a reciprocating compressor is operating the crankcase pressure is closest to which of the following?
Evaporator pressure
In a compression refrigeration system, how would the evaporator be effected if it becomes oil logged?
Loss of refrigeration effect.