Module 9 Flashcards Preview

MT 108 Chapter 4 > Module 9 > Flashcards

Flashcards in Module 9 Deck (33):
1

a motor that converts pressure energy directly into mechanical energy

Pneumatic motor

2

a motor with a mechanical seal somewhere between the inlet and outlet ports

Positive-displacement motor

3

a rating of a pneumatic motor's ability to withstand air pressure without damage or internal leakage

Pressure rating

4

the rotational force exerted on an object

Torque

5

the turning force the motor exerts from a dead stop

Starting torque

6

the turning force exerted when the motor is running, and which changes with any change in air pressure

Running torque

7

the force necessary to stop the motor once it is running

Stalling torque

8

A pneumatic motor converts kinetic energy and potential energy of compressed air into rotary _____.

Mechanical Energy

9

Pneumatic motors are classified both by their driving elements and by their principles of _____.

Operation

10

Unlike turbines or energy convertors, all pneumatic motors have _____ displacement.

Positive

11

Name the three kinds of motor torque.

Starting Torque
Running Torque
Stalling Torque

12

The horsepower output of an air motor is the product of the motor's torque and _____.

Shaft Speed

13

When selecting a pneumatic motor, always check the maximum air _____ required to drive it.

Consumption

14

Compared with hydraulic motors, pneumatic motors are more easily _____.

Controlled

15

Name the three types of pneumatic motor construction.

Vane
Radial-Piston
Axial-Piston

16

The reciprocating motion of the axial-piston motor is converted to rotary motion by the _____.

Wobble Plate

17

When a radial-piston motor is running, the entering compressed air is first directed to a _____ valve.

Rotating

18

Pneumatic rotary actuators usually travel less than one _____.

Revolution

19

Reciprocating rotary motion is delivered by a piston-type rotary actuator by means of a(n) _____ gear set.

Rack-and-Pinion

20

To control the amount of torque delivered to the tool, a pneumatic impact wrench usually has an adjustable _____ in its drive train.

Clutch

21

Chipping hammers are usually powered by a reciprocating _____.

Piston

22

A hydraulic system can be pressurized by a pneumatic system through the use of an air _____.

Booster

23

In an air booster, hydraulic fluid occupies the _____-diameter chamber.

Small

24

What type of energy is available from a pneumatic motor?

Mechanical kinetic energy

25

Which of the following is most important to consider when selecting a pneumatic motor?
a. Air consumption
b. Lubrication requirements
c. Mounting features
d. Output shaft size

a. Air consumption

26

Pneumatic motors are classified according to their _____.

Driving elements and principle of operation

27

The main advantage pneumatic motors have over hydraulic motors is that pneumatic motors _____.

Are more portable.

28

All pneumatic motors are constructed with a mechanical seal and operate on the principle of _____.

Positive displacement.

29

Which of the following is not a type of positive displacement motor?
a. Axial-piston
b. Radial-piston
c. Rotary-actuator
d. Vane

Rotary-actuator.

30

Which of the following relationships is most likely to be found in a pneumatic motor?
a. Running torque = 75% of stalling torque
b. Running torque = 75% of starting torque
c. Starting torque = 75% of running torque
d. Starting torque = 75% of stalling torque

d. Starting torque = 75% of stalling torque

31

The direction of rotation in a pneumatic motor is reversed by means of ______.

Reversing the airflow.

32

The horsepower output of a pneumatic motor is calculated on the basis of the motor's _____.

Torque and speed.

33

Vane motors are found mostly in _____.

Power drills and wrenches.