– PXI (PCI eXtensions for Instrumentation) is a rugged PC-based platform for measurement and automation, using PCIe for high throughput and specialized timing and synchronization. 7. What is the function of the “While Loop” structure in LabVIEW’s block diagram? A) Executes code a fixed number of times B) Executes code once and stops C) Continuously executes the code inside until a conditional terminal (e.g., stop button) becomes True D) Only runs if a specific error occurs
– VI leverages software (e.g., LabVIEW) and modular hardware to let users define their own instruments, rather than being limited by fixed-function traditional devices. 2. Which of the following best describes the fundamental difference between a traditional instrument and a virtual instrument? A) Traditional instruments are faster B) Virtual instruments have a fixed user interface (buttons/knobs), while traditional instruments are software-defined C) Traditional instruments have hardware-defined functionality, while virtual instruments are software-defined with the hardware providing acquisition/control D) Virtual instruments cannot measure real-world signals
– A DAQ board typically includes ADCs (Analog-to-Digital Converters) and DACs (Digital-to-Analog Converters), along with signal conditioning. 6. Which hardware communication bus/standard is specifically designed for modular, high-speed, low-latency virtual instrumentation, often used in PXI systems? A) RS-232 B) USB C) PCI Express / PXI Express D) Bluetooth virtual instrumentation mcq
– In a traditional instrument, functions are fixed by the manufacturer. In a VI, the software defines the processing, analysis, and display; the hardware (DAQ) only interfaces with the real world. 3. Which software platform is most commonly associated with Virtual Instrumentation? A) MATLAB B) LabVIEW (Laboratory Virtual Instrument Engineering Workbench) C) Python with PyVISA D) C++
– Data Acquisition refers to the process of sampling real-world physical signals and converting them into digital numeric values. 11. In LabVIEW, a “Shift Register” on a loop is used to: A) Shift bits in a binary number B) Pass data from one loop iteration to the next (e.g., store previous value) C) Register a shift in the user interface D) Change the loop’s iteration count – PXI (PCI eXtensions for Instrumentation) is a
– While other languages can be used, LabVIEW (graphical programming) is the industry standard for VI, especially from National Instruments (now NI). 4. In LabVIEW, a Virtual Instrument (VI) consists of two main parts: A) Block Diagram and Icon/Connector B) Front Panel and Block Diagram C) Toolbar and Controls Palette D) Functions Palette and Project Explorer
– Real-world sensors often produce weak, noisy, or non-linear signals. Signal conditioning (amplifiers, filters, excitation) makes them suitable for the DAQ board. 14. Which of the following is NOT a typical component of a virtual instrumentation system? A) Computer with VI software B) DAQ hardware C) Physical front-panel hard keys (like a dedicated oscilloscope knob) D) Sensors/transducers A) Executes code a fixed number of times
– In LabVIEW, the Block Diagram uses a dataflow model: a node (function) executes when data is available at all its inputs. 13. What is the role of “Signal Conditioning” in a VI system? A) To delete noise from digital signals B) To prepare raw sensor signals (e.g., amplify, filter, isolate, linearize) before ADC conversion C) To display signals on the front panel D) To save data to a hard drive