Question 1

Spring return valves are not very common in industry.

Accepted Answer

Spring return valves are actually quite common in industry. They are used in applications where the valve needs to return to a closed position automatically in case of power or air failure. Examples of industries that use spring return valves include oil and gas, chemical, and pharmaceutical.

Question 2

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

Accepted Answer

This is because a solenoid operates by creating a magnetic field through the flow of current through wire coils. The direction of the current determines the direction of the magnetic field. In alternating current, the direction of the current changes constantly, which causes the magnetic field to also alternate. In direct current, the current flows in one direction only, but the magnetic field will still be created in the same direction as long as the current is flowing through the wire coils. Therefore, a solenoid designed for alternating current can also be operated on direct current.

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 ____________________.

Accepted Answer

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 ____.&#10;A) plunger slamming&#10;B) damage to the coil&#10;C) sluggish action&#10;D) increased loading

Accepted Answer

When the plunger does not complete its stroke, the solenoid coil does not achieve its intended magnetic circuit, leading to a higher current flow through the coil. This excessive current can cause overheating and potentially damage the coil.

Question 5

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

Accepted Answer

Solenoid-controlled valves can be used to control both air and hydraulic circuits.

Question 6

Proportional solenoids can operate in ____ direction(s) of movement.&#10;A) one&#10;B) two&#10;C) three (right, left, and center)&#10;D) four

Accepted Answer

Proportional solenoids can move in one direction only, meaning that they can push or pull a component either towards or away from the solenoid's core. They cannot move in multiple directions or to a specific position like a servo motor would.

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.

Accepted Answer

The answer of Servo valves use a(n) ____________________ to indirectly...

Question 8

The current in amperes at the open position is called ____ current.&#10;A) sealed&#10;B) holding&#10;C) magnetic&#10;D) inrush

Accepted Answer

The current at the open position is called inrush current, which is the initial surge of electrical current that flows into a device when it is first turned on. This is because at the open position, there is no resistance in the circuit which allows the current to freely flow into the device, causing a surge in current.

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.

Accepted Answer

The answer of Clamping circuits with a short stroke cylinder...

Deck 5: Solenoids