What is the primary function of a sensor in an embedded system?
To process and store data
To control external devices
To measure and collect data from the environment
To execute program instructions
Answer : C
Explain : A sensor is a device that detects changes in the environment and responds to some output on another system. Sensors can detect physical stimuli such as: Light, Heat, Sound, Pressure, Motion and Moisture.
8051 is :
4-bit Microcontroller
8-bit Microcontroller
12-bit Microcontroller
16-bit Microcontroller
Answer : B
Explain : The 8051 is a single-chip microcontroller (MCU) series developed by Intel in 1980. 8051 is an 8-bit (data bus) microcontroller built with 40 pins DIP (dual inline package). 8051 has internal RAM (128 Bytes) and ROM (4K Bytes).
LDR Sensors are made of:
Semiconductor
PbS
Lead Sulfide
All of these
Answer : D
Explain : The Light-dependent resistors are made with photosensitive semiconductor materials like Cadmium Sulphides (CdS), lead sulfide, lead selenide, indium antimonide, or cadmium selenide.
The wireless battery free sensor designed to record environmental and material temperature is:
DHT11
ESP8266
RFM3200
LM35
Answer : C
Explain : The RFM3200 is a wireless, battery-free temperature sensor that can monitor the environment and material temperature in a variety of settings. The DHT11 is used for Temperature and humidity sensor. The ESP8266 is a low-cost Wi-Fi microchip, with built-in TCP/IP networking software, and microcontroller capability. LM35 is a temperature used to measure temprature in celcius.
The memory used while saving the data during „PROGMEM utility‟ is:
DRAM
Flash
SRAM
EEPROM
Answer : B
Explain : The PROGMEM utility in Arduino uses flash memory to store data. The PROGMEM keyword is a variable modifier that tells the compiler to store information in flash memory instead of SRAM. This is useful for storing large chunks of data without taking up RAM
The selection of Microcontrollers for IoT is based on:
Individual Characteristics
Stablity
Desirable output
All of these
Answer : D
Explain : The selection of Microcontroller is depend on output, characterstics and features.
IoT comprises of internet, physical devices, sensors, microcontroller, and _______:
Information
Actuators
Intranet
Electronics
Answer : B
Explain : Actuators in the Internet of Things (IoT) are devices that convert digital signals into physical actions. They are used to control or manipulate physical things.
LDR Sensors:
Light Dependent Resistor
2 pinned IC
Controls Light Intensity
All of these
Answer : A
Explain : LDR stands for Light Dependent Resistor. An LDR sensor module has four pins: AO: Analog output pin,DO: Digital output pin,GND: Ground,VCC: Voltage etx.
Microcontrollers are:
Embedded System
Application-specific
Harvard
All of these
Answer : D
Explain : An embedded system is a microprocessor- or microcontroller-based system of hardware and software designed to perform dedicated functions .Microcontrollers are based on the Harvard architecture where program and data busses are kept separate.
MQ135 Sensor is:
AI detector
Gas Sensor
Monitors Air Pollution
(B) and (C)
Answer : D
Explain : The MQ135 is an air quality sensor that detects, measures, and monitors gases in the air.
Humidity Sensor is related to:
DHT11
Hygrometer
Parts Per Million or Relative Humidity
All of these
Answer : D
Explain : The DHT11 is a commonly used Temperature and humidity sensor that comes with a dedicated NTC to measure temperature and an 8-bit microcontroller.
Which one is not a microcontroller in Embedded Ecosystem ?
PIC
8086
ARM
8051
Answer : B
Explain : PIC is a family of microcontrollers made by Microchip Technology. Here, Intel 8086 is a microprocessor. A microprocessor is a central processing unit (CPU). A microcontroller (MCU) integrates a CPU.
What is ESP8266 used in IoT applications?
Low-cost Wi-Fi module
Microprocessor on a chip
In-build HTTP software
High-cost Wi-Fi module
Answer : A
Explain : The ESP8266 is a Wi-Fi module that is used to develop Internet of Things (IoT) applications. It is a system on a chip (SOC) microchip that is produced by Espressif Systems. The ESP8266 is a standalone wireless transceiver that is available at a low price.
Microprocessors have following components embedded in them:
RAM
Memory
ROM
None of these
Answer : D
Explain : Basic components of microprocessor : ALU, CU and register.
In Microcontrollers, external access is used for:
Power supply
Latches
Memory Interfacing
Peripherals
Answer : C
Explain : In microcontrollers, external access is used to enable or disable external memory interfacing. The EA (External Access) pin is used for this purpose.