CLAD CLAD User Interface & Event Handling

Question 1

What is the primary purpose of the Event Structure in LabVIEW?

Accepted Answer

To respond to user interface interactions and programmatic events without polling

Answer

To handle file I/O events

Answer

To create timed loops

Answer

To manage hardware interrupts

Question 2

Which type of event in LabVIEW is generated before the control value changes and can be discarded?

Accepted Answer

Filter event

Answer

Value Change event

Answer

Mouse Down event

Answer

Notify event

Question 3

How do you prevent a LabVIEW front panel control from being modified by the user while the VI is running?

Accepted Answer

Use the 'Disable' property node to set the control's disabled state

Answer

Set the control to indicator type

Answer

Right-click the control and select 'Key Navigation > Tab Stop: Off'

Answer

Change the control's mechanical action to 'Latch When Pressed'

Question 4

What is the difference between a Control and an Indicator on a LabVIEW front panel?

Accepted Answer

Controls accept user input and provide data to the block diagram; indicators display output data

Answer

Controls are only numeric; indicators are only Boolean

Answer

Controls run faster than indicators

Answer

There is no functional difference

Question 5

Which LabVIEW structure is commonly used together with an Event Structure to build a responsive GUI application?

Accepted Answer

While Loop

Answer

Sequence Structure

Answer

For Loop

Answer

Case Structure

Question 6

What does the 'Lock Front Panel' option in an Event Structure do?

Accepted Answer

Blocks other events from being processed while the current event case is executing

Answer

Prevents the user from resizing the front panel

Answer

Saves the front panel layout

Answer

Locks all controls to their current values