2ND 22

Question 1

Ram type cylinders are usually returned by _________ .

a) Revolution
b) Rotation
c) Gravity
d) Flow

Answer 1

c) Gravity

Question 2

Double-acting cylinders are returned by ___________ .

a) Revolution
b) Gravity
c) Hydraulics
d) Rotation

Answer 2

c) Hydraulics

Question 3

With a delivery of 3 GPM to the cap end of a two-inch cylinder, the speed is _________ inches/minute.

a) 2,207
b) 220.7
c) 2,206
d) 220.6

Answer 3

d) 220.6

Question 4

The force exerted by a three-inch diameter ram at 2000 PSI is ______ pounds.

a) 1,437
b) 14,136
c) 14,137
d) 14,237

Answer 4

c) 14,137

Question 5

What pressure is developed when exerting a 14,000 pound force over a piston area of seven square inches?

a) 1,500 PSI
b) 2,500 PSI
c) 2,000 PSI
d) 2,100 PSI

Answer 5

c) 2,000 PSI

Question 6

The displacement of a hydraulic motor is the amount of fluid in cubic inches to make one _________.

a) Operation
b) Revolution
c) Horsepower
d) Gallon

Answer 6

b) Revolution

Question 7

Torque ratings of hydraulic motors are usually given in pound-inches or pound-feet per ________ PSI.

a) 25
b) 50
c) 100
d) 110

Answer 7

c) 100

Question 8

A winch requires 50 pound-feet maximum torque to operate. What size hydraulic motor is needed if maximum pressure is limited to 1,500 PSI? ________ pound-inches per 100 PSI

a) 40
b) 50
c) 20
d) 70

Answer 8

a) 40

Question 9

A 20 pound-inch motor operates with a torque load of 500 pound-inches. What is the operating pressure?

a) 1,500 PSI
b) 2,000 PSI
c) 2,500 PSI
d) 2,200 PSI

Answer 9

c) 2,500 PSI

Question 10

Which of the following is not a class of hydraulic motors?

a) LMPG
b) HSLT
c) Torque actuator
d) LSHT

Answer 10

a) LMPG

Question 11

In “balanced” design motors the vanes are held out against the cam ring surface by the use of system ________.

a) RPM
b) Pressure
c) Stroke length
d) Thrust

Answer 11

b) Pressure

Question 12

In high performance vane motors, coil springs hold the vanes against the ring. The vanes are essentially in hydraulic ________.

a) Rotation
b) Flow
c) Balance
d) Revolution

Answer 12

c) Balance

Question 13

Torque is developed in the in-line piston motor through the angular relationship of the pistons to the ______.

a) Vane
b) Swash plate
c) Cam ring
d) Baffle

Answer 13

b) Swash plate

Question 14

When the displacement of a variable motor is increased, the torque availability is _______.

a) Decreased
b) Increased
c) Stabilized
d) Not changed

Answer 14

b) Increased

Question 15

The most efficient hydraulic motor is the ________ type.

a) Gear
b) Vane
c) Piston
d) Load

Answer 15

c) Piston

Question 16

Motor displacement is varied in response to workload changes by the ________ control.

a) Linear
b) Torque
c) Swash plate
d) Compensator

Answer 16

d) Compensator

Question 17

Devices which usually cannot rotate continuously in one direction are _______.

a) Torque actuators
b) Variable generators
c) Torque generators
d) Both A and C

Answer 17

d) Both A and C

Question 18

Internal gear motors fall into two categories: Direct drive and ____.

a) Indirect
b) Reverse
c) Orbiting
d) External

Answer 18

c) Orbiting

Question 19

A hydraulic motor which will not permit continuous rotation in either direction is a motor.

a) Rotating vane
b) Limited rotation
c) Reverse rotation
d) Rotary piston

Answer 19

b) Limited rotation