Deck 5: Solenoids

Question 1

Spring return valves are not very common in industry.

Answer 1

False

Question 2

A solenoid designed to operate on alternating current can also be operated on direct current.

Answer 2

True

Question 3

When the coil of a solenoid is energized, a magnetic field produces a force that acts on the solenoid plunger. This force is called ____________________.

Answer 3

pull

Question 4

It is important that the plunger completes its stroke when the solenoid is energized. Otherwise, the current in the coil will be high, resulting in ____.

A) plunger slamming
B) damage to the coil
C) sluggish action
D) increased loading

Question 5

A solenoid-controlled valve cannot be used to control air or hydraulic circuits.

Question 6

Proportional solenoids can operate in ____ direction(s) of movement.

A) one
B) two
C) three (right, left, and center)
D) four

Question 7

Servo valves use a(n) ____________________ to indirectly position the main spool and are used mainly for high-performance, closed-loop control of speed or position.

Question 8

The current in amperes at the open position is called ____ current.

A) sealed
B) holding
C) magnetic
D) inrush

Question 9

Clamping circuits with a short stroke cylinder are potential applications for the use of a ____________________; especially if the loss of power to the clamps during machine operation could cause parts to be released and potentially injure an operator.