Unit E: Hydraulics 1

Question 1

A ____ directional control valve is generally more economical to install.

Answer 1

Electrical

Question 2

Flaring can only be accomplished successfully on steel tube that has a wall thickness of less than ____ in/mm.

Answer 2

0. 109 in

2. 77 mm

Question 3

The baffle plate in a hydraulic oil reservoir slows the ____ of the return oil and it forces the ____ oil to flow along the reservoir walls.

Answer 3

Velocity

Return

Question 4

Gas charged accumulators are most commonly used in heavy equipment ____.

Answer 4

Hydraulics

Question 5

____ relates to the transmission of force and/or motion using liquid motion.

Answer 5

Hydrodynamics

Question 6

The measurement of the force per unit area required to move two parallel surfaces that are separated with a given film thickness of oil is ____.

Answer 6

Absolute viscocity

Question 7

Flow is produced by a pressure ____ across an orifice.

Answer 7

Drop

Question 8

Cavitation is a violent ____ of entrained gas bubbles.

Answer 8

Collapse

Question 9

Lines entering a hydraulic reservoir must terminate ____ the fluid level.

Answer 9

Below

Question 10

Tubing with a wall thickness of less than .065 in may distort or collapse if ____ type connectors are used.

Answer 10

Bite