Module 9

Question 1

a motor that converts pressure energy directly into mechanical energy

Answer 1

Pneumatic motor

Question 2

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

Answer 2

Positive-displacement motor

Question 3

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

Answer 3

Pressure rating

Question 4

the rotational force exerted on an object

Answer 4

Torque

Question 5

the turning force the motor exerts from a dead stop

Answer 5

Starting torque

Question 6

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

Answer 6

Running torque

Question 7

the force necessary to stop the motor once it is running

Answer 7

Stalling torque

Question 8

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

Answer 8

Mechanical Energy

Question 9

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

Answer 9

Operation

Question 10

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

Answer 10

Positive

Question 11

Name the three kinds of motor torque.

Answer 11

Starting Torque
Running Torque
Stalling Torque

Question 12

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

Answer 12

Shaft Speed

Question 13

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

Answer 13

Consumption

Question 14

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

Answer 14

Controlled

Question 15

Name the three types of pneumatic motor construction.

Answer 15

Vane
Radial-Piston
Axial-Piston

Question 16

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

Answer 16

Wobble Plate

Question 17

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

Answer 17

Rotating

Question 18

Pneumatic rotary actuators usually travel less than one _____.

Answer 18

Revolution

Question 19

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

Answer 19

Rack-and-Pinion

Question 20

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

Answer 20

Clutch

Question 21

Chipping hammers are usually powered by a reciprocating _____.

Answer 21

Piston

Question 22

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

Answer 22

Booster

Question 23

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

Answer 23

Small

Question 24

What type of energy is available from a pneumatic motor?

Answer 24

Mechanical kinetic energy

Question 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

Answer 25

a. Air consumption

Question 26

Pneumatic motors are classified according to their _____.

Answer 26

Driving elements and principle of operation

Question 27

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

Answer 27

Are more portable.

Question 28

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

Answer 28

Positive displacement.

Question 29

Which of the following is not a type of positive displacement motor?

a. Axial-piston
b. Radial-piston
c. Rotary-actuator
d. Vane

Answer 29

Rotary-actuator.

Question 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

Answer 30

d. Starting torque = 75% of stalling torque

Question 31

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

Answer 31

Reversing the airflow.

Question 32

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

Answer 32

Torque and speed.

Question 33

Vane motors are found mostly in _____.

Answer 33

Power drills and wrenches.