Modern Chap 19/20 Flashcards Preview

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Flashcards in Modern Chap 19/20 Deck (99)
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1

Compressors are driven by an ______ motor

electric

2

Compressors that are driven by an external motor are called ___________ compressors

open drive

3

compressors that are driven by an integrated motor are called _________ compressors

hermetic

4

There are two ways of joining a motor to an open drive compressor ______ drive and _____ driven

direct drive and belt driven

5

A direct drive compressor is driven by a _______ connecting the shaft of an electric motor directly to the compressor shaft

coupling

6

On a _________ compressor, a belt connects a pulley on the drive motor to a pulley on the compressor shaft

belt driven

7

On most compressors, the compressor pulley is larger than the ______ pulley which causes the compressor to turn more slowly than the motor

motor

8

Refrigeration compressors can also be driven by ________________ engines

internal combustion

9

Fully hermetic compressors are built in sizes from ____hp to ___hp

1/6hp to 20hp

10

A ______ ring is a split metal ring that is installed in a groove that encircles the piston

piston

11

Name the two types of piston rings;

compression rings and oil rings

12

Upper piston rings are known as compression rings, their purpose is to prevent pressurized _________ from blowing past the piston

refrigerant

13

The lower oil ring is designed to help ________ the cylinder wall while simultaneously preventing excess lubricant from entering the cylinder

lubricate

14

__________ are metal cylinders that connect the pistons to the connecting rods

piston pins

15

Compressor cylinders are usually made of

cast iron

16

As the piston moves down it creates a ______

vacuum

17

Although the refrigerant in the intake manifold is at a low pressure, it is still a greater pressure than the _______ in the cylinder when the piston is moving down

vacuum

18

As the piston moves upward in the cylinder, the increased pressure ______ the intake valve

seals

19

Poppet valves are only suitable for ____ speed compressors because they operate slowly

low speed

20

The _______ head serves as a pressure plate, sealing the top of the cylinder so the refrigerant can be compressed

cylinder head

21

A cylinder head also provides ______ passages into and out of the compressor

vapour

22

The portion of the compressor housing that supports the crankshaft is called the _______

crankcase

23

The portion of the housing that contains the cylinders is generally called the ________ block

cylinder

24

Adding more cylinders increases the _______ capacity for each revolution of the crankshaft

pumping

25

Compressors can have from one to _____ cylinders

twelve

26

Name some different cylinder arrangements:

Vertical, V, X, Y, Z, or radial

27

In a ________ design there is no connecting rod

scotch yoke

28

Scotch yoke is popular in _____ high ______ compressors

small high speed

29

In a scotch yoke design the piston and cylinder are _____

long

30

A rotary compressor is a compressor in which vapour compression takes place in spaces between the __________ and sides of an off-centre rotor that spins inside the cylinder

cylinder wall