Ultrasonics

Predict the typical frequency range of ultrasonic waves used in industrial applications

• below 20 Hz

• 20Hz - 20KHz

• Above 20KHz to several MHz

Choose the principles in ultrasonic distance measurement sensors commonly used in robotics and automation?

• Resonance Absorption

• Laser Interference

• Time-of-Flight

In which application is ultrasonic welding commonly used in the electronics industry?

• join wired connections

• Etching copper tracks on PCBs

• Cutting silicon wafers

Select the material commonly used as a transducer in ultrasonic applications

• Germanium

• Silicon

• Quartz or Lead Zirconate Titanate (PZT)

Why ultrasonic testing (UT) widely used in the aerospace and manufacturing industries?

• To check for software bugs

• To clean surfaces

• To detect internal cracks and material defects without damaging the object

Select the primary reason for using ultrasonic sensors in automotive parking systems

• To measure engine temperature

• To detect nearby objects and obstacles

• To increase fuel efficiency

Identify the principle employed in ultrasound imaging for medical diagnostics.

• Magnetic deflection

• Echo reflection from tissue interfaces

• X-ray absorption

In industrial automation, ultrasonic sensors are preferred over IR sensors for object detection. Justify the reason.

• Ultrasonics work better in dark environments and with transparent objects

• IR is more accurate in all conditions

• Ultrasonics use optical signals

In a prototype car, you are testing ultrasonic-based blind spot detection modules. On highways, the system fails to detect motorbikes approaching at high speed. As an electronics engineer, how would you improve this system?

• Use Doppler-enabled ultrasonic sensors

• Reduce vehicle speed in software

• Add infrared LEDs

Select the audible frequency range of humans.

• 20Hz - 20KHz

• 0 Hz - 20Hz

• above 40KHz