Motor Control

Question 1

True or false?
Timers enable a multitude of operations in a control circuit to be started and stopped at different intervals

Answer 1

True

Question 2

The ? timing relay typically uses a pneumatic device, and the slow release of air produces the delay.

Answer 2

Mechanical

Question 3

The ? timing relay offers time delays over a greater range and with far better accuracy than the other two types of timing relays.

Answer 3

Electronic

Question 4

An ? timer is a device with a preset time period between energizing the timer or applying the input signal and the action of the timer output contacts. During the timing period, no change occurs in the timer output contacts.

Answer 4

On-Delay

Question 5

What type of contacts activate when the timing relay is energized and return to their original state when the timing relay is de-energized?

Answer 5

Instantaneous

Question 6

Once initiated, ? contacts change state after a set time period has passed. Once the time has passed, all normally open timed contacts close and all normally closed timed contacts open.

Answer 6

DOE

Question 7

An ? timer is a device with a preset time period that starts after the input signal is removed. The timer output contacts change when the input signal or external trigger is applied, and the contacts remain in the changed state until after the timing period.

Answer 7

Off-Delay

Question 8

The off-delay timer function is also called a ? .

Answer 8

DODE

Question 9

Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact prior to power being applied to the coil?

Answer 9

Closed

Question 10

Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact immediately after power is applied to the coil?

Answer 10

Closed

Question 11

Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact 30 seconds after power is applied to the coil?

Answer 11

Open

Question 12

Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact as soon as power is removed from the coil?

Answer 12

Closed

Question 13

Which timer is appropriate for keeping a motor starter energized after power is removed from the timer’s power input?

Answer 13

DODE

Question 14

What is the abbreviation for delay on de-energize?

Answer 14

DODE

Question 15

Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact prior to power being applied to the coil?

Answer 15

Closed

Question 16

Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact immediately after power is applied to the coil?

Answer 16

Open

Question 17

Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact 20 seconds after power is removed from the coil?

Answer 17

Open

Question 18

Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact 30 seconds after power is removed from the coil?

Answer 18

Closed

Question 19

True or False?
Motor control drawings show their components in the “Normal” de-energized state.

Answer 19

True

Question 20

Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact prior to the input of the external trigger switch?

Answer 20

Open

Question 21

Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact immediately after an input signal is received from the external trigger?

Answer 21

Closed

Question 22

Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact immediately after the input signal is removed from the external trigger?

Answer 22

Closed

Question 23

Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact 10 seconds after the input signal is removed from the external trigger?

Answer 23

Open

Question 24

A conveyor may be required to run for a period of time after a stop circuit is activated to assure the product is cleared from the conveyor, this would be an application for which type of timing relay?

Answer 24

DODE

Question 25

After a start signal is received to start a pump motor, a time delay is required to allow time for pre-lube to the pump. This would be an application for which type of timing relay?

Answer 25

DOE

Question 26

The current carrying capacities for most timing relays is ? .

Answer 26

10A

Question 27

What are the 3 types of timer configurations?

Answer 27

-Dashpot Timer: Mechanical -Synchronous Timer: Electrical -Solid State Timer: Electronic

Question 28

Mechanical and electronic timers are often called?

Answer 28

Timing Relays

Question 29

? means that when the timer is turned on, the time delay starts. When the timed delay is complete, the contacts change from closed to open, When the timer is turned off, the contacts return to the closed position.

Answer 29

Normally Closed, timed open (NCTO)

Question 30

? means that when the timer is turned on, the timed delay starts. When the timed delay is complete, the contacts changed from open to closed. When the timer is turned off, the contacts return to the open position.

Answer 30

Normally open, timed closed (NOTC)

Question 31

? has power applied to the electronics and a trigger signal used to initiate the time and start the time delay. The contacts changed state after the trigger signal is active. They remain in the changed state after the trigger signal is deactivated for the duration of the set delay. After the delay period the contacts return to their original position.

Answer 31

Off delay electronic timer

Question 32

? is a timing device that opens and closes a contact depending on the position of the hands or dials on the clock.

Answer 32

Synchronous timer

Question 33

? are timing devices that provide a time delay by controlling the rate of fluid flow through a constricted orifice

Answer 33

Dashpot timers

Question 34

? is a timing device on which a set time delay is initiated when the timer is turned on. When the set delay elapse, the contacts change positions.

Answer 34

on delay timer