Data Acquisition Systems — MCQs – EE

1. What does Data Acquisition (DAQ) refer to?
(A) The process of converting data into images
(B) The process of measuring and digitizing real-world signals
(C) The process of storing digital files
(D) The process of transmitting data wirelessly

2. The main purpose of a Data Acquisition System (DAS) is to:
(A) Acquire, process, and store data from sensors
(B) Control electric motors
(C) Display analog signals only
(D) Convert digital signals into audio

3. The first step in a data acquisition system is:
(A) Signal sensing
(B) Data storage
(C) Analog-to-digital conversion
(D) Signal display

4. A typical Data Acquisition System includes:
(A) Sensors, signal conditioning, ADC, and computer
(B) Only sensors and display units
(C) Amplifiers and power supply
(D) CPU and printer

5. The sensor in a DAQ system:
(A) Detects physical parameters and converts them into electrical signals
(B) Stores data in memory
(C) Controls signal flow
(D) Displays results

6. The signal conditioning unit in a DAQ system performs:
(A) Amplification, filtering, and isolation
(B) Data storage
(C) Signal display
(D) Mechanical conversion

7. The Analog-to-Digital Converter (ADC) in a DAQ system:
(A) Converts analog signals into digital form
(B) Converts digital signals into analog form
(C) Filters signals
(D) Stores data

8. The sampling rate of a DAQ system refers to:
(A) The number of samples taken per second
(B) The total memory capacity
(C) The number of output channels
(D) The voltage range of input signals

9. According to the Nyquist theorem, the sampling frequency should be:
(A) At least twice the highest frequency of the signal
(B) Equal to the signal frequency
(C) Half the signal frequency
(D) One-fourth of the signal frequency

10. A multiplexer (MUX) in a DAQ system is used to:
(A) Select one signal from multiple inputs
(B) Amplify the input signal
(C) Convert digital to analog signals
(D) Store data

11. The resolution of an ADC determines:
(A) The smallest voltage change it can detect
(B) The sampling rate
(C) The maximum input frequency
(D) The power consumption

12. A 12-bit ADC can represent how many discrete levels?
(A) 4096
(B) 1024
(C) 2048
(D) 8192

13. The accuracy of a DAQ system depends mainly on:
(A) Resolution, noise level, and calibration
(B) Signal color and type
(C) System size
(D) Operating voltage only

14. A sample-and-hold circuit in a DAQ system:
(A) Holds the analog signal constant during conversion
(B) Stores digital data
(C) Amplifies the signal
(D) Filters noise

15. The aliasing effect occurs when:
(A) Sampling frequency is too low
(B) ADC resolution is too high
(C) Signal is amplified excessively
(D) Signal is filtered properly

16. To prevent aliasing, a low-pass filter is used as:
(A) An anti-aliasing filter
(B) A signal inverter
(C) A feedback circuit
(D) A voltage limiter

17. The digital data from the ADC is usually processed by:
(A) A microprocessor or computer
(B) A rectifier
(C) A DC motor
(D) A resistor network

18. A data logger is:
(A) A self-contained DAQ system that records data over time
(B) A power amplifier
(C) A display unit
(D) A control valve

19. The interface between the DAQ hardware and the computer is usually:
(A) USB, PCI, or Ethernet
(B) Mechanical linkage
(C) Hydraulic coupling
(D) Optical fiber only

20. Real-time data acquisition means:
(A) Data is collected and processed as events occur
(B) Data is processed after collection
(C) Data is simulated
(D) Data is transmitted in batches only

21. The main advantage of computer-based DAQ systems is:
(A) High-speed and flexible data processing
(B) Lower data storage
(C) Complex wiring
(D) High power consumption

22. The DAQ software is responsible for:
(A) Controlling acquisition, analysis, and display of data
(B) Amplifying analog signals
(C) Cooling the system
(D) Synchronizing mechanical parts

23. The resolution of a DAQ card is typically expressed in:
(A) Bits
(B) Hertz
(C) Volts
(D) Seconds

24. A 16-bit DAQ system provides higher:
(A) Resolution and accuracy
(B) Sampling frequency only
(C) Power efficiency
(D) Temperature stability

25. The gain in a signal conditioning circuit is adjusted to:
(A) Match sensor output with ADC input range
(B) Filter noise
(C) Reduce bandwidth
(D) Store data efficiently

26. Quantization error in ADC occurs due to:
(A) Finite resolution of digital conversion
(B) Signal amplification
(C) Noise filtering
(D) Temperature drift

27. Synchronous sampling means:
(A) Multiple signals are sampled in coordination with a clock signal
(B) Signals are sampled randomly
(C) One signal is sampled per minute
(D) Data is sampled without timing reference

28. Analog multiplexing allows:
(A) Multiple analog signals to share one ADC channel
(B) Faster ADC conversion
(C) Digital data storage
(D) Noise removal

29. The main role of the computer in a DAQ system is to:
(A) Control, analyze, and visualize data
(B) Generate analog signals
(C) Replace sensors
(D) Act as a multiplexer

30. A Distributed Data Acquisition System is used when:
(A) Sensors are located far apart across different locations
(B) Only one sensor is used
(C) Data is collected manually
(D) System operates without communication