Deck 21: Control and Controlled Devices

Question 1

What kind of switches are designed to switch higher voltages and currents?

A) standard duty
C) pilot duty
B) heavy duty
D) regular duty

Answer 1

B

Question 2

A retroreflective device transmits the light to a reflector and detects the reflected light at its receiver.

Answer 2

True

Question 3

The letters NO represent ____.

A) not open
C) normally off
B) not operated
D) normally open

Answer 3

D

Question 4

____________________ switches are noncontact-type switches that are used to sense the presence or absence of an object without actually contacting the object.

Question 5

A relay is a(n) ____________________ switch.

Question 6

Photoelectric switches have all but which of the following components?

A) transmitter
C) receiver
B) transformer
D) switching device

Question 7

The difference between a motor starter and a relay or contactor is that a motor starter also contains ____________________ protection for the motor.

Question 8

When a relay is in its de-energized state, a magnetic field exists in the coil.

Question 9

Pushbutton switches are manually operated and require a turning motion to operate.

Question 10

Which of the following is not a type of relay?

A) time-delay
C) double-throw
B) latching
D) diffuse

Question 11

What are the two versions of the inductive proximity switch?

Question 12

Some type of human intervention is needed to operate ____________________ devices.

Question 13

The make-before-break switch is used in circuits that cannot tolerate the brief open-circuit condition created by the break-before-make switch.

Question 14

A capacitive proximity switch senses conductive and non-conductive material.

Question 15

Inductive proximity switches will not detect ____.

A) aluminum
C) steel
B) iron
D) plastic

Question 16

Which of the following is not a part of a limit switch?

A) actuator
C) contact blocks
B) body
D) housing

Question 17

When a relay is de-energized, ____.

A) the contacts remain closed
B) the contacts are mechanically held
C) spring tension causes the contacts to open
D) cooling is required before the relay can be re-energized

Question 18

What are the three methods of operating a photoelectric switch?