Compressors

What is the lowest percentage of full capacity that a digital scroll can be safely operated for extended periods?

• The digital scroll compressor can only operate at full capacity.

• The minimum capacity is 10% to ensure that the compressor gets proper lubrication.

• The compressor can be operated at 0% by simply leaving the unloading solenoid energized?

• The digital scroll compressor cannot be operated below 50% capacity.

Compressor cylinder unloading reduces the capacity of a reciprocating compressor by?

• Flooding the unloaded cylinders with oil.

• Blocking off the discharge port in the unloaded heads.

• Making the valves in the head inoperative.

• Disconnecting the pistons in the unloaded cylinders.

Rotary compressors are commonly used in:

• Window units.

• Commercial refrigeration systems.

• Chillers.

• Large central split systems.

The function of the compressor in the refrigeration cycle is to:

• Filter the refrigerant.

• Lower the pressure and temperature of the refrigerant.

• Raise the pressure and temperature of the refrigerant.

• Regulate the refrigerant flow.

A compressor that compresses gas between a fixed spiral and an orbiting spiral is a:

• Rotary Compressor

• Scroll Compressor

• Centrifugal Compressor

• Screw Compressor

All refrigeration compressors are designed to pump:

• Only Liquid

• Mostly liquid with small quantities of vapor

• Only Vapor

• Mostly vapor plus small quantities of liquid

Which of the following has the capacity range for a centrifugal compressor?

• Commercial AC

• Residential AC

• Appliance

• Refrigeration

What type of compressors contain the compressor and motor together inside a welded steel housing?

• Reciprocating

• Hermetic compressor

• Open compressor

• Semi-hermetic compressor

An advantage of open-drive compressors is that:

• They are smaller and more compact than hermetic compressors.

• The motor and compressor can be replaced separately.

• They require no type of regular maintenance.

• They are generally less expensive tan comparable semi-hermetic compressors.

An oil slinger is used with reciprocating compressors that are lubricated by:

• Oil slingers are used only with scroll compressors.

• Splash lubrication.

• Both splash and pressure lubrication.

• Pressure lubrication.