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CLAD Ambiguous Questions

Hi all

The two questions below are taken from an example CLAD exam paper currently downloadable from this site. At first glance the two questions contradict each other i.e question 3 (d)  "Property Nodes can be used to programmatically generate a Value Change event" stated as being a correct answer and question 19 (b) "Changing a Front Panel control’s Value property via a property node" stated as being incorrect.

 

I realise that a (Signalling) property node is to be used when generating an event but why is that statement not made in question 3 instead of the more generic statement "Property Nodes"? Confusing almost to the point of being deliberate.

 


3. Which of the following apply to Property Nodes? (More than one answer may apply.)
 a. Property Nodes allow attributes of front panel objects to be programmatically manipulated.
 b. Property Nodes can be used to update the values contained in a front panel object.
 c. More than one Property Node can be used for a single front panel object.
 d. Property Nodes can be used to programmatically generate a Value Change event.

 

Correct Answer: A, B, C, D
Topic: Property Nodes Justification: All of the statements are true for Property Nodes. References: Property Node

 

19. Which of the following will cause an event to be captured by the LabVIEW Event Structure?
 a. Changing a Front Panel control’s Value via a mouse click on the control
 b. Changing a Front Panel control’s Value property via a property node
 c. Changing a Front Panel control’s Value via a control reference
 d. Changing a Front Panel control’s Value via a local variable

 

Correct Answer: A Topic: Event Structures Justification: Each possible answer refers to a Value Change event. Value Change events are either generated by user interaction on the front panel, or by calling a Value (Signaling) Property Node. Calling a Value Property Node does not generate an event. References: Available Events, Using Events in LabVIEW

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Both are correct.  But there is a slight difference.  The property "Value" does not cause an event to fire.  But the property "Val(sig)" (Value Signaling) does trigger an event.


GCentral
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Answer 3d talks about property nodes in general. Answer D is definitely true, all you need is pick the right property to do it.

Answer 19b specifically talks about a "Value property", which cannot trigger an event.

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One other point to consider, (And I know you'll hate this)  Some features of LabVIEW are newer than some of the test distractors (Wrong answers) in the examples.   The Value(Signaling) Property showed up a few versions behind the property node itself.  So, there are versions of LabVIEW where no property can fire a value change event.

 

Fortunately the number of questions where this type of inconsistancy occurs is rare and getting rarer.  You don't need to ace the test to pass.  You merely need to demonstrate that you are familliar with the concepts covered.  If you are familliar with all of the concepts covered in Core I and II you will pass.


"Should be" isn't "Is" -Jay
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Which DAQ board will allow for the detection of a 2.6 mV change in a signal if a 0-10 volt range was selected?

 

A   12-bit board

B   16-bit board

C   Both A. and B.

D   None of the above.

 

GIVE ANSWER FOR THIS WITH EXPLAINATION

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Please give your assesment of what the answer should be too. :manhappy:

Mark Ramsdale
Program Manager & CLA
Global Demo and Equipment at National Instruments
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