Chp 19

In rotating - vane compressors , the vanes may be brought into contact with the cylinder walls by spring pressure or by _____

Centrifugal, force

The scotch yoke type of reciprocating compressors do not use

Conecting rods

Attaches the piston to the crankshaft

Connecting rod

To prevent liquid, refrigerant, slugging, and all your slugging on compressors that operate in low ambient temperature, equip it with a

Crank case heater

Hey Chef section that is larger and has different centers from the rest of the shift

E centric

Sure false the shells of fully hermetic compressors are typically both together

F

True or False ? Due to its method of compression , a screw compressor does not provide discharge pressure that is as smooth or pulsation - free as that of a reciprocating compressor .

False

True or False ? In a scroll compressor , refrigerant vapor is compressed between two spinning scrolls .

False

True or false if the pulley on a open drive, compressor has a diameter three times greater than the pulley on the drive motor. The compressor shaft will rotate three times faster than the motor shaft

False

Compressor parts are both together usually contain___to prevent leaks

Gaskets

In a centrifugal compressor , the spinning ______flings refrigerant outward , compressing it against the casing .

Impeller

A__ring helps to lubricate the cylinder wall, and prevent excess lubricant from entering the cylinder

Oil

An internal unloaders typically operated by

Oil pressure controlled by soleniod valve

Moves up and down in the cylinder to draw air compressor discharge the refrigerant vapor

Piston

Connect pistons to connect rods

Piston pins

Creates a seal between the piston and cylinder wall

Piston ring

Adding refrigerant and lubricant , checking pressure , and other procedures require the use of

Seevice vaulves

An HVACR muffler uses a _______ to reduce noise caused by gas pulsations .

Set of baffels

In scroll compressors , refrigerant typically enters the scrolls from the ____ and exits out the____

Sides and center

wich of the following statements about splash lubrication systems is false

The crank case may be filled with oil up to the bottom of the main bearings

Which of the following best describes the way fully hermetic compressors are lubricated

They are lubricated by oil circulating with the refrigerant

The outer diameter of a piston ring is larger than the diameter of the cylinder

True

Located between the cylinder head and the cylinder block

Valve plate

A measure of an oil's ability to flow at given temperatures is its

Viscosity

An ________ prevents refrigerant leaks around the shaft of an open - drive compressor .

shaft seal