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CLD-R Question 6 paper 1

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Just going throught he sample exams

 

Am I missing something?

 

6. Which of the following statements about events is true?

a. The timeout event causes an event to fire every x ms where x is the value wired to the timeout terminal.

b. When you press and release a button with a mechanical action of Latch When Released it creates two value change events.

c. Setting the “lock front panel until the event case for this event completes” option on an event will ignore any events that occur during the processing of that event.

d. When processing a filter event, wiring a corresponding terminal from the Event Data Node to the Event Filter Node has the same effect as leaving the Event Filter Node unwired. 

 

To me both a and d are correct.  The only way I can think that a is not correct is if a negative number were wired to the timeout terminal.  However, wiring a negative number to a terminal wouldn't make sense so it seems reasonable to assume a is correct.  Is this the reason? It seems to be a bit tricky for a 40 question exam.

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Accepted by topic author SeanJ
08-27-2015 04:09 PM

A is not quite correct.  The timeout will be fired if x ms has passed since the last received event.  So each time you receive a new event, the timer is reset.

 

For example, if your timeout is 100 and you got a button value changed event at 99, it will be another 100 ms before the timeout can happend.  If you do the math, then the timeouts were almost 200ms apart.


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A. should be clarified. As it stands, it's generally true and a common use of that terminal. The text should be modified to say that the timeout will fire even if other events occur. That would make the answer obviously false if you were somewhat knowledgeable about LabVIEW

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@nanocyte wrote:

A. should be clarified. As it stands, it's generally true and a common use of that terminal. The text should be modified to say that the timeout will fire even if other events occur. That would make the answer obviously false if you were somewhat knowledgeable about LabVIEW


A.  Is obviously false (if you are somewhat knowledgeable about LabVIEW.)  

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