Quiz 15
Where is the receiver located in an acr system
Liquid line
If the system you are charging is a self contained system, and the manufactures tag is still on the unit you should charge unit by ___
Refrigerant weight
The queen valve is located at the inlet of the receiver
True
When estimating what condenser pressure should be for an air cooled condenser you should add ___ to the ambient temp
30-35f
Which of the following best describes the compression action in a screw compressor?
A pair of helical rotors trap and compress vapor between the lobes in one rotor and the grooves in the other rotor
Which of the statements regarding centrifugal compressors is not true
As the speed of a centrifugal compressor increases its efficiency decreases
An ___ connects the piston to the crankshaft in a reciprocating compressor
Connecting rod
What line is the oil separator installed in
Discharge line
What line should a filter drier never be installed in?
Discharge line
The king valve is located at the inlet of the receiver
False
Which of the following statements regarding scroll compressors is not true
In a scroll compressor vapor is compressed by a series of Pistons that travel in a spiral pattern though a fixed scroll
Which of the following statements regarding rotary compressors is not true?
Rotary compressor have low volumetric efficiency
A reciprocating compressor that has a long piston with an elliptical slot in the bottom of the piston skirt and no connecting rod is referred to an ___
Scotch yoke design
When you are charging a txv system you charge by the ___ method
Sub cooling
What line is the accumulator installed in
Suction line
When you are charging a fixed orifice system you use ___ method
Superheat
Which of the following best describes a direct drive compressor?
The compressors crankshaft is connected to the motors drive shaft by a coupling
Which of the following is a trait of stationary blade rotary compressor?
The impeller is mounted on an eccentric shaft
The primary purpose of a crankcase heater is ___
To minimize the amount of liquid refrigerant in the compressor oil
Which of the following statements is a common method of cooling compressors
Using cool suction vapor and oil to cool the compressors motor Running water through water jackets in the compressor Blowing air across cooling find on the compressors exterior
