CLAD LabVIEW Programming Fundamentals 3 — Questions and Answers
Question 1: What is the default behavior of Auto-Indexing on a For Loop output tunnel?
- Auto-Indexing is enabled by default, accumulating values into an array (Correct answer)
- Auto-Indexing is disabled by default, passing only the last value
- Auto-Indexing is enabled by default, but only for numeric types
- Auto-Indexing must be manually enabled each time it is used
Correct answer: Auto-Indexing is enabled by default, accumulating values into an array
For Loop output tunnels have auto-indexing enabled by default, collecting each iteration's value into an array.
Question 2: Which function correctly initializes a 1D array of 10 zeros in LabVIEW?
- Initialize Array with element=0 and dimension size=10 (Correct answer)
- Build Array with 10 individual zero constants wired
- Array Size with a constant 10 wired to it
- Reshape Array with a constant zero and size 10
Correct answer: Initialize Array with element=0 and dimension size=10
Initialize Array creates an n-dimensional array filled with a specified element value; wiring 0 and 10 creates a 1D array of ten zeros.
Question 3: What color is a string wire in LabVIEW's block diagram?
- Pink (magenta) (Correct answer)
- Green
- Orange
- Blue
Correct answer: Pink (magenta)
String data types are represented by pink (magenta) wires on the LabVIEW block diagram.
Question 4: Which terminal type on a SubVI connector pane indicates that an input is required?
- A terminal that causes the VI to be broken if left unwired (Correct answer)
- Any terminal displayed in bold on the connector pane
- Only terminals located on the left side of the connector pane
- Terminals with a yellow background in the connector pane editor
Correct answer: A terminal that causes the VI to be broken if left unwired
Required inputs are set in the connector pane editor; leaving them unwired breaks the calling VI, signaling that the input is mandatory.
Question 5: What is the function of the 'Wait Until Next ms Multiple' function compared to 'Wait (ms)'?
- It synchronizes loop timing to a multiple of the system clock, reducing timing drift over many iterations (Correct answer)
- It waits longer than 'Wait (ms)' by doubling the specified time
- It pauses execution until the next rising edge of a digital signal
- It is identical to 'Wait (ms)' but accepts seconds instead of milliseconds
Correct answer: It synchronizes loop timing to a multiple of the system clock, reducing timing drift over many iterations
'Wait Until Next ms Multiple' aligns delays to a multiple of the clock tick, preventing accumulated timing drift in loops compared to 'Wait (ms)'.
Question 6: In LabVIEW, a broken VI (broken Run arrow) means:
- The block diagram contains errors that prevent the VI from running (Correct answer)
- The VI is currently running and cannot be edited
- The VI front panel has no controls or indicators
- The VI requires administrator privileges to execute
Correct answer: The block diagram contains errors that prevent the VI from running
A broken arrow on the Run button indicates one or more block diagram errors, such as unconnected required terminals or type mismatches, that prevent execution.
Question 7: Which LabVIEW structure is best suited for implementing a state machine?
- A While Loop containing a Case Structure with an enum shift register (Correct answer)
- A Sequence Structure with one state per frame
- A For Loop with a case structure inside
- A Flat Sequence Structure with Boolean tunnels between frames
Correct answer: A While Loop containing a Case Structure with an enum shift register
The canonical LabVIEW state machine uses a While Loop, an enum-typed shift register to track state, and a Case Structure that executes the logic for each state.
CLAD LabVIEW Programming Fundamentals 3
What is the default behavior of Auto-Indexing on a For Loop output tunnel?