Module 9 Flashcards Preview

MT 108 Chapter 3 > Module 9 > Flashcards

Flashcards in Module 9 Deck (30):
1

a motor that converts the movement and pressure of hydraulic fluid into the energy of a rotating shaft

Hydraulic motor

2

a motor that has a mechanical seal between the inlet and outlet ports

Positive-displacement motor

3

the range of operating pressures from the minimum needed to turn a hydraulic motor to the maximum the motor can withstand without suffering damage.

Pressure range

4

the twisting effect that causes a piece of equipment to rotate

Torque

5

All hydraulic motors have _____ displacement.

Positive

6

The shaft speed of a fixed, positive-displacement motor can be changed by varying the _____ of the hydraulic fluid.

Flow rate

7

The pressure range for most hydraulic motors varies from _____ to _____ psi.

100; 5000

8

Name the three kinds of motor torque.

Starting torque
Running torque
Stalling torque

9

When selecting a replacement motor for a system, always make sure it is compatible with the system's _____.

Fluid

10

The service life of a hydraulic motor is measured in _____.

Hours

11

A hydraulic motor functions by changing the volume of its ____.

Fluid chamber

12

As fluid under pressure moves through the motor, its moving energy is transferred to the _____ of the motor.

Revolving shaft

13

Rotation in an internal gear motor is caused by fluid pressure acting on the _____.

Gear teeth

14

Gear motors may be supplied with _____ plates to help maintain the pressure and reduce internal leaks.

End or Wear

15

A vane motor made with two motor chambers is called a(n) _____ motor.

Balanced

16

A vane motor with a movable cam ring has a _____ displacement.

Variable

17

Variable-displacement vane motors have higher internal _____ than fixed-displacement motors.

Slippage

18

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

Cam Plate

19

For axial-piston motors, displacement is adjusted by changing the angle of the _____.

Swash Plate

20

Rotary actuators move in an arc that is less than a full _____.

Revolution

21

The speed of a hydraulic motor is determined by the fluid's

Flow rate

22

All hydraulic motors are _____ motors.

Positive-displacement

23

The maximum fluid pressure that a motor can withstand is defined by

Its pressure range.

24

The force exerted by a hydraulic motor while operating normally is called

Running torque

25

When a new hydraulic motor is installed in an existing system, its compatibility must be checked against all of the following except the
a. effect the fluid has on the seals
b. fluid's resistance to foaming
c. fluid's viscosity index
d. piping material

d. Piping material

26

The service life of a hydraulic motor is given in

Hours of operation

27

The pressure of the hydraulic fluid entering an internal gear motor acts on the

Gear teeth

28

Gear motors are frequently equipped with wear plates to prevent

Internal leakage.

29

Which of the following characteristics applies to variable-displacement hydraulic motors?
a. balanced design
b. compact size
c. economical operation
d. high slippage rates

d. High slippage rates.

30

How far can vane-type rotary actuators rotate?

Just under one revolution.