IoT Operating Systems ISE Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which type of operating system is specifically designed to meet strict timing deadlines?

   • AGeneral-purpose operating system
   • BNetwork operating system
   • CReal-time operating system (RTOS)
   • DLightweight embedded operating system
   Reveal Solution Discussion Select an answer first
2. 22expert · hard

   A battery-powered sensor node runs an RTOS and must transmit a reading every 10 seconds. The radio consumes 20 mA during transmission and 1 µA in sleep. The CPU consumes 10 mA active and 2 µA in deep sleep. The node must run for 5 years on a 1000 mAh battery. Which power management strategy is most likely to meet the battery life requirement?

   • AUse a low-frequency clock to keep the CPU in a low-power active state
   • BDisable the radio sleep mode to avoid wake-up latency
   • CPut both the CPU and radio into deep sleep between transmissions, waking only for the 10-second interval
   • DKeep the CPU active and the radio in sleep mode between transmissions
   Reveal Solution Discussion Select an answer first
4. 23expert · hard

   A company is developing a battery-powered industrial vibration sensor that must sample at 20 kHz, perform FFT analysis, and transmit results over Wi-Fi every 5 minutes. The device has 256 KB of RAM and a 200 MHz Cortex-M7 MCU. The team must choose an OS. Which OS choice best balances the conflicting requirements of real-time sampling, power consumption, and Wi-Fi connectivity?

   • AA bare-metal loop with a custom Wi-Fi driver
   • BA general-purpose OS with a real-time patch, such as PREEMPT_RT
   • CA full Linux distribution with a standard Wi-Fi driver
   • DA lightweight RTOS with a Wi-Fi stack and tickless idle mode
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What is the primary role of an operating system in an IoT device?

   • ATo replace the application firmware with a web-based interface
   • BTo exclusively handle network communication, leaving all other tasks to the application
   • CTo provide a direct user interface for every IoT device
   • DTo manage hardware resources and provide services to applications
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A medical IoT device runs on an RTOS with only 128 KB of RAM and must never reboot due to memory corruption. The team is deciding between static and dynamic memory allocation for its tasks. Which approach best supports the safety requirement?

   • AUse a single global heap shared by all tasks without protection
   • BDisable the memory protection unit to reduce overhead
   • CUse static allocation for all tasks and buffers, and enable the MPU to isolate task memory regions
   • DUse dynamic allocation with a memory pool and periodic defragmentation
   Reveal Solution Discussion Select an answer first