Deck 19: Proximity Detectors

Question 1

Figure 19-03


The accompanying figure shows a detector that uses a tank circuit tuned to the frequency of the oscillator. This type of sensor is a(n) ____________________.

Answer 1

small transformer

Question 2

Why are many capacitive proximity detectors being used to replace mechanical limit switches?

Answer 2

Many capacitive proximity detectors are being used to replace mechanical limit switches because they do not have to make contact with an object to sense its position.

Question 3

Some proximity detectors employ sound waves and can be used to detect the distance to an object or to determine the position of a object.

Answer 3

True

Question 4

Figure 19-02


In the accompanying diagram, when the current flow through the resistor is decreased, what happens to the voltage?

Question 5

If proximity detectors are used in areas that contain metal shavings or dust, an effort should be made to do what?

Question 6

Figure 19-05


In the circuit shown in the accompanying figure, what happens when a nonferrous metal, such as aluminum, copper, or brass, is placed near the sensor coil?

Question 7

Capacitive proximity detectors depend on metal to operate.

Question 8

Proximity detectors used to sense all types of metals will sense nonferrous metals better than ferrous metals.

Question 9

Figure 19-09


The accompanying figure shows ______________________________ detectors used as position sensors.

Question 10

Sensors should be mounted as close to other metals as possible.

Question 11

One disadvantage of capacitive proximity detectors is that they have a very limited ____________________.

Question 12

Figure 19-02


In the accompanying figure, the presence of metal is causing a(n) ____________________ of voltage across the register.

Question 13

Proximity detectors are used to sense the presence of an object without physically touching it.

Question 14

How do ultrasonic detectors operate and what can they determine?

Question 15

A(n) ____________________ is a device used to generate alternating current at a desired frequency.