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


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

E) A) and D)
F) A) and B)

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For the program shown, the timer accumulated time is set to zero anytime: For the program shown, the timer accumulated time is set to zero anytime:   A) PB1 is closed. B) PB2 is closed. C) PB1 is open. D) PB2 is open.


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

E) A) and B)
F) A) and C)

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


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.

E) All of the above
F) None of the above

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

A) True
B) False

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For the hardwired timer circuit shown, contact TD-1 is the ____ contact and TD-2 is the ____ contact. For the hardwired timer circuit shown, contact TD-1 is the ____ contact and TD-2 is the ____ contact.   A) ON, OFF B) OFF, ON C) instantaneous, timed D) timed, instantaneous


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

E) A) and D)
F) B) and C)

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When the timing of a device is not reset on a loss of power, the timing is said to be:


A) continuous
B) holding
C) retentive
D) saved

E) A) and C)
F) C) and D)

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The on-delay timer (TON) starts timing when the timer's:


A) ladder rung switches from false to true.
B) ladder rung switches from true to false.
C) accumulated value equals its preset value.
D) accumulated value is greater than its preset value.

E) B) and C)
F) All of the above

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For the programmed timer circuit shown, the pilot light should come on: For the programmed timer circuit shown, the pilot light should come on:   A) as soon as the switch is closed. B) before the switch is closed. C) for 15 seconds after the switch is opened. D) as soon as the switch is closed and for 15 seconds after the switch is opened.


A) as soon as the switch is closed.
B) before the switch is closed.
C) for 15 seconds after the switch is opened.
D) as soon as the switch is closed and for 15 seconds after the switch is opened.

E) All of the above
F) C) and D)

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RES instructions are used with:


A) TOF timers
B) TON timers
C) RTO timers
D) all of these

E) All of the above
F) A) and C)

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The relay contact drawn is designed to operate so that: The relay contact drawn is designed to operate so that:   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.


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.

E) B) and C)
F) All of the above

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