Deck 16: Limit Switches

Question 1

What is the function of limit switches?

Answer 1

Limit switches are used to detect when an object is present or absent from a particular location.

Question 2

Figure 16-01
In the accompanying figure, the ____________________ detects position of boxes on a conveyer line.

Answer 2

limit switch

Question 3

The basic micro switch can be obtained with a variety of different activating arms.

Answer 3

True

Question 4

A subminiature microswitch employs a similar spring contact arrangement as the basic micro switch.

Question 5

Figure 16-11
In the accompanying figure, if the UP push button is pressed, what will happen?

Question 6

Figure 16-10
In the accompanying figure, when the platform is to travel from the upper floor to the lower floor, a(n) ____________________ opens and permits oil to return to a holding tank.

Question 7

When a bumper arm is impacted, it will not cause the contacts to change position.

Question 8

The ____________________ switches are approximately one-half to one-quarter the size of the basic switch.

Question 9

Generally, limit switches are used as ____________________ devices that control the coil of relays and motor starters in control circuits.

Question 10

Name two characteristics of a micro limit switch.

Question 11

Figure 16-11
In the accompanying figure, what happens when the DOWN button is pressed?

Question 12

Figure 16-10
In the accompanying figure, a platform is used to raise material from the bottom floor to an upper floor. A(n) ____________________ is used to raise the platform.

Question 13

Limit switches are momentary contact (spring returned), but not maintained contacts.

Question 14

Limit switches contain only a single set of contacts.

Question 15

Figure 16-04
In the accompanying figure, what does the wedge drawn under the switch symbol represent?