Question 1

The type of timer program shown is a:

Accepted Answer

A)  retentive on-delay.
B)  retentive off-delay.
C)  nonretentive off-delay
D)  nonretentive on-delay.

Question 2

An RTO timer retains the present accumulated value when the rung goes false.

Accepted Answer

A) True 
 B)False

Question 3

For the timer relay contact shown,when the relay coil is de-energized,there is a time delay before the contact closes.

Accepted Answer

A) True 
 B)False

Question 4

The operation of a PLC retentive timer is similar to that of an:

Accepted Answer

A)  electromagnetic pneumatic timer.
B)  electromechanical motor-driven timer.
C)  off-delay timer.
D)  on-delay timer.

Question 5

For the timer program shown,output D is switched ON when:

Accepted Answer

A)  power is applied.
B)  input A is closed.
C)  the timer is accumulating time.
D)  the accumulated value equals the preset value.

Question 6

For the on-delay timer instruction shown the timer number is:

Accepted Answer

A)  0
B)  200
C)  T4:3
D)  0.1

Question 7

A lamp is to be switched off 10 s after a switch has been switched from it's on to off position.The most directly applicable timer to use would be the off-delay nonretentive timer.

Accepted Answer

A) True 
 B)False

Question 8

For the timer relay contact shown,when the relay coil is energized,there is a time delay before the contact closes.

Accepted Answer

A) True 
 B)False

Question 9

For the programmed timer circuit shown,when the switch is initially closed motor(s) _____ start(s) immediately.

Accepted Answer

A)  M1
B)  M2
C)  M3
D)  all of these

Question 10

Which one of the following timer parameters determines the time duration for the timing circuit?

Accepted Answer

A)  Accumulated time.
B)  Preset time.
C)  Timer address.
D)  Time base.

Question 11

For the hardwired timer circuit shown,contact TD-1 is the ____ contact and TD-2 is the ____ contact.

Accepted Answer

A)  ON,OFF
B)  OFF,ON
C)  instantaneous,timed
D)  timed,instantaneous

Question 12

To reset a retentive timer,the:

Accepted Answer

A)  AC time must be greater than the PR time.
B)  PR time must be greater than the AC time.
C)  AC time must equal the PR time.
D)  none of these.

Question 13

The relay contact drawn is designed to operate so that:

Accepted Answer

A)  when the relay coil is energized,there is a time delay in closing.
B)  when the relay coil is energized,there is a time delay in opening.
C)  when the relay coil is de-energized,there is a time delay before the contact opens.
D)  when the relay coil is de-energized,there is a time delay before the contact closes.

Question 14

Certain contacts of a mechanical timing relay are designed to operate at a preset time interval:

Accepted Answer

A)  after the coil is energized.
B)  after the coil is de-energized.
C)  after power is applied to the circuit.
D)  either a or b.

Question 15

For the timer program shown,output C is switched ON when:

Accepted Answer

A)  power is applied.
B)  input A is closed.
C)  the timer is accumulating time.
D)  the accumulated value equals the preset value.

Question 16

The on-delay timed period for the timer shown would be:

Accepted Answer

A)  3 seconds
B)  4 seconds
C)  20 seconds
D)  200 seconds

Question 17

Timer instructions are found on all PLCs manufactured today.

Accepted Answer

A) True 
 B)False

Question 18

The main difference between a TON and TOF timer is that the:

Accepted Answer

A)  TON timer can maintain its accumulated time on loss of power or logic continuity.
B)  TOF timer can maintain its accumulated time on loss of power or logic continuity.
C)  TOF timer begins timing when logic continuity to the timing rung is lost.
D)  TON timer begins timing when logic continuity to the timing rung is lost.

Question 19

Which one of the following timer parameters determines the accuracy of the timer?

Accepted Answer

A)  Accumulated time.
B)  Preset time.
C)  Timer address.
D)  Time base.

Question 20

For the program shown,the timer accumulated time is set to zero anytime:

Accepted Answer

A)  PB1 is closed.
B)  PB2 is closed.
C)  PB1 is open.
D)  PB2 is open.

Exam 7: Programming Timers

An RTO timer retains the present accumulated value when the rung goes false.

Correct AnswerverifiedShow Answer

For the programmed timer circuit shown,when the switch is initially closed motor(s) _____ start(s) immediately.

Correct AnswerverifiedShow Answer

The relay contact drawn is designed to operate so that:

Correct AnswerverifiedShow Answer

The operation of a PLC retentive timer is similar to that of an:

Correct AnswerverifiedShow Answer

The on-delay timed period for the timer shown would be:

Correct AnswerverifiedShow Answer

For the timer relay contact shown,when the relay coil is energized,there is a time delay before the contact closes.

Correct AnswerverifiedShow Answer

To reset a retentive timer,the:

Correct AnswerverifiedShow Answer

Which one of the following timer parameters determines the time duration for the timing circuit?

Correct AnswerverifiedShow Answer

For the timer program shown,output C is switched ON when:

Correct AnswerverifiedShow Answer

For the on-delay timer instruction shown the timer number is:

Correct AnswerverifiedShow Answer

For the hardwired timer circuit shown,contact TD-1 is the ____ contact and TD-2 is the ____ contact.

Correct AnswerverifiedShow Answer

A lamp is to be switched off 10 s after a switch has been switched from it's on to off position.The most directly applicable timer to use would be the off-delay nonretentive timer.

Correct AnswerverifiedShow Answer

The main difference between a TON and TOF timer is that the:

Correct AnswerverifiedShow Answer

For the timer relay contact shown,when the relay coil is de-energized,there is a time delay before the contact closes.

Correct AnswerverifiedShow Answer

Certain contacts of a mechanical timing relay are designed to operate at a preset time interval:

Correct AnswerverifiedShow Answer

The type of timer program shown is a:

Correct AnswerverifiedShow Answer

For the timer program shown,output D is switched ON when:

Correct AnswerverifiedShow Answer

Timer instructions are found on all PLCs manufactured today.

Correct AnswerverifiedShow Answer

Which one of the following timer parameters determines the accuracy of the timer?

Correct AnswerverifiedShow Answer

For the program shown,the timer accumulated time is set to zero anytime:

Correct AnswerverifiedShow Answer

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For the hardwired timer circuit shown,contact TD-1 is the contact and TD-2 is the contact.

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