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MT 108 Chapter 4 > Module 2 > Flashcards

Flashcards in Module 2 Deck (31):
1

a compressor with mechanically separated inlet and discharge ports

Positive-displacement compressor

2

a compressor with no method of separating inlet and discharge ports; permit free passage of air when not running

Dynamic compressor

3

a type of compressor designed for high air volume rather than high pressure

Impeller (or blower)

4

actual cubic feet per minute; compressor capacity measured at the intake when installed

Acfm

5

standard cubic feet per minute; compressor capacity specified at standard intake conditions

Scfm

6

Name the five kinds of positive displacement rotary compressor.

Sliding Vane
Dry screw
Wet screw
Liquid ring
Impeller

7

A single-stage valve compressor can normally produce discharge pressures of _____ psi.

50

8

Dry rotary-screw positive-displacement compressors have how many rotors?

Two

9

Single-stage dry rotary-screw compressors normally produce discharge pressures of _____ psi.

50

10

The mating lobes of a wet rotary-screw compressor are driven by the power source _____ timing gears.

Without (One lobe powers the other).

11

The space where the air is compressed in a liquid-ring compressor is formed by _____.

Liquid

12

Because of its low discharge pressure, an impeller compressor is often referred to as a _____.

Blower

13

To prevent contact, the impellers of an impeller compressor are _____.

Timed by external gears

14

The compressing impellers of a three-stage centrifugal compressor are mounted on a(n) _____.

Speed Increaser

15

Most centrifugal compressors are equipped with _____ and _____ to prevent excessive air temperatures.

Intercoolers; Aftercoolers

16

To be efficient, the rotors in dynamic compressors must rotate at _____ speeds.

High

17

The discharge pressure of a multistage dynamic compressor is determined by the number of stages and the _____ per _____.

Pressure per Stage

18

The most efficient method of controlling the output of centrifugal compressors is by _____.

Speed Variation

19

The rotating blades of axial-flow compressors are positioned between stationary _____ blades.

Diffuser

20

In plants having different compressed air requirements, it may be advantageous to install the compressor(s) in _____ location(s).

Several

21

The term acfm may be referred to as _____ capacity.

Free air or Actual cubic feet per minute

22

What is the maximum discharge pressure of a single-stage sliding-vane compressor?

50 psi

23

What type of positive-displacement compressor is best suited for light-duty applications?

Diaphragm

24

What type of compressor will deliver large amounts of oil-free air at approximately 100 psi?

Dry rotary-screw

25

A centrifugal compressor is classified as a(n) _____ compressor.

Dynamic

26

The compressing lobes of a wet rotary-screw compressor are driven without _____.

Timing gears.

27

The impellers of centrifugal compressors rotate at high speeds to ensure _____.

Efficient operation

28

Impeller compressors are frequently referred to as _____.

Blowers

29

The most efficient method of controlling the output of a centrifugal compressor is by _____.

Speed variation

30

Impeller compressors use the same operating principle as _____.

Gear pumps

31

The term used to describe the measured capacity of a compressor after it is installed is _____.

Actual cubic feet per minute