The relay contact drawn is designed to operate so that a. when the relay coil is

Question

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 in closing d. when the relay coil is the energized, there is a time delay in opening In general, the three different types of PLC timers are a TON, TOF, and RTO b. TON, TOF, and PRE c. TON, ACC, and RTO d. TT, EN, and DN Which of the following is NOT a quantity associated with the timer instruction? A. preset time b. accumulated time c. time of day d. time base A common application or an MCR zone control involves examining one or more fault bits as part of the ____ and enclosing the portion of the program you want de-energized in case of a fault in the MCR zone. a. start fence b. end fence c. subroutine d. temporary end instruction A subroutine is a section of program that is not scanned unless there is a. a fault b. a need to execute a section of the program on a time basis rather than on an event basis c. a request for the scan to go to that particular subroutine d. a forced input or output condition

Explanation / Answer

answers

for 1]: ans is a

In the given question the symbol of relay indicates that the relay is open (as open switch i.e. NOTC relay)

So the answer is a that is when the relay coil is energized there is time delay in closing.

Because, In time delay relay system, the contacts might not open or closed until some time interval after the coil has been energized.This is called delay on operate. ON delay timing relay have special names as NOTC normally open time closed and NCTO normally closed time open

for 2]: ans is a

TON : On delay timer

TOF : Off delay timer

RTO : Retentive timer

for 3]: ans is c

The four parameters are required for timer which associated with the timer instruction tha are

1. Timer Number

2. Time Base

3. Preset Time/Value

4. Accumulated Time/Value

for 4]: ans is a

When the MCR (Master control reset) in the start fence is false all rungs within the Zone are treated as false

All non retentive outputs within the zone are de-energized and the scan ignore all of the inputs within the zone

for 5]: ans is c

A subroutine is a section of program that is not scanned unless thereis a request for the scan to go to that particular subroutine.

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