Deck 7: Temperature Sensing, Devices M Solenoid and Motor Operated Valves

Question 1

____________________ is a metal that remains in a liquid state at room temperature.

Answer 1

Mercury

Question 2

The term thermistor is derived from the words "____________________ resistor."

Answer 2

thermal

Question 3

Describe bimetal strips and how they work.

Answer 3

The bimetal strip is made by bonding two dissimilar types of metal together. Because these two metals are not alike, they have different expansion rates. This causes the strip to bend or warp when heated. A bimetal strip is often formed into a spiral shape. The spiral permits a longer bimetal strip to be used in a small space. A long bimetal strip is desirable because it exhibits a greater amount of movement with a change of temperature.

Question 4

Compare and contrast smart and standard temperature transmitters.

Question 5

In industrial applications, manually operated valves are generally used.

Question 6

The control system for MOVs is basically a forward/reverse control with the addition of a special limit switch and a torque switch.

Question 7

Solenoid valves contain two distinct parts, the ____ part and the valve part.

A) electrical
B) magnetic
C) float
D) pressure

Question 8

In a MOV, the ____ switch is generally used to stop the motor when the valve is closed.

A) pressure
B) torque
C) limit
D) float

Question 9

____________________-way valves are generally used to control the air supplied to double-acting cylinders.

Question 10

Motor operated valves are valves that employ a(n) ____________________ motor to open or close the valve.

Question 11

How are two-way solenoid valves used?

Question 12

MOV control systems are divided into what two sections?