147 + Interview Questions in Interfacing Of Sensors in Arduino Page 3 InterviewSolution

101.	How many pins are present in the ESP8266 WiFi Module?(a) 12(b) 10(c) 8(d) 50I have been asked this question during an interview.This question is from ESP8266 Wifi Module topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct ANSWER is (c) 8 The explanation is: The ESP8266 WiFi Module has 8 pins which includes the GPIO-0, GPIO-1, RX, TX, Vcc, GND and CH_EN. All these pins have very SPECIFIC functions and input patterns which need to be connected in PERFECT order in order for the module to function properly.

Discussion

102.	What is the optimum current that is required to operate the MPU 6050 Sensor?(a) 20 mA(b) 15 mA(c) 200 A(d) 1 AThe question was posed to me by my college professor while I was bunking the class.This question is from MPU6050 Sensor Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» RIGHT choice is (b) 15 mA The explanation: The current rating on any SENSOR is GIVEN so that users can know what is the optimum current that NEEDS to be fed to the active sensor such that the internal electronics is not destroyed by excess current.

Discussion

103.	What kind of sensor is the GSR Sensor?(a) Passive(b) Active(c) Radio(d) Pressure basedI got this question in an online interview.This question is from GSR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct choice is (b) ACTIVE The best explanation: The GSR sensor is an active sensor since it requires an active DC voltage source to function properly. On the CONTRARY, an LDR can be said to be a sort of a passive sensor since it does not require the INPUT of current from an external source for its WORKING.

Discussion

104.	Which of the formulae give us the angular velocity in the MPU 6050 along the X axis?(a) Angular velocity along the X axis = (Gyroscope X axis raw data/131) °/s(b) Angular velocity along the X axis = (Gyroscope X axis raw data/132) °/s(c) Angular velocity along the X axis = (Gyroscope X axis raw data/12) °/s(d) Angular velocity along the X axis = (Gyroscope X axis raw data/130) °/sI got this question in homework.This intriguing question originated from MPU6050 Sensor Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» CORRECT answer is (a) Angular velocity along the X axis = (Gyroscope X axis RAW data/131) °/s To EXPLAIN I would SAY: (Gyroscope X axis raw data/131) °/s gives the correct value of the angular velocity of the MPU 6050 sensor. Here all the three values read from the 3 data pins of the Gyroscope module in the MPU 6050 are to be REPLACED in the equation one by one in order to get the 3D Model.

Discussion

105.	What are the factors that affect the performance of the Ultrasonic Sensor during operation?(a) Distant Target Object(b) Target Object hidden by fog(c) Smoke(d) DustI got this question in semester exam.This interesting question is from Ultrasonic Sensor in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct option is (a) Distant Target Object The best explanation: The Ultrasonic SENSOR uses sound WAVES of very high FREQUENCY to locate and track objects that are in it’s range. The advantages of this technique is that since we are using sound Waves, other factors like most, or fog or anything that causes low VISIBILITY become immaterial. However, the only problem is since the sound Waves are propagated at every direction from the source, they become WEAK as the distance increases and so they are inefficient in dealing with long distance targets.

Discussion

106.	What is the resolution of the OV7670 Camera Module?(a) 640×480 VGA(b) 640×481 VGA(c) 640×1020 VGA(d) 640×12 VGAThis question was addressed to me in an interview.This intriguing question comes from OV7076 Camera Module topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct OPTION is (a) 640×480 VGA Easiest explanation: 640×480 VGA is the correct RESOLUTION of the OV7670 Camera Module. The resolution of a camera is the number of pixels that the camera output has,both HORIZONTAL and vertical that forms the IMAGE matrix, be it for STILL images or video outputs.

Discussion

107.	What is the use of the Vcc2 pin?(a) Input(b) Output(c) Activation(d) Power inputI have been asked this question in semester exam.The query is from Motor Driver (L293D) and Motors topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT answer is (d) POWER input Explanation: The Vcc2 PIN is used to input a high AMOUNT of voltage and is not INTERNALLY used by the IC. It is there to power the motors attached to it. This way the same IC can be used for controlling higher powered motors.

Discussion

108.	What kind of device is the ESP8266 WiFi Module?(a) Passive Sensor(b) Active Sensor(c) Networking Device(d) Switching DeviceThis question was addressed to me during an interview.Asked question is from ESP8266 Wifi Module topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT answer is (c) Networking Device To explain: The ESP8266 WiFi Module is a networking device SINCE it’s MAIN FUNCTION in any system is to be able to connect to any nearby WiFi network for uploading or downloading data hence enabling IOT.

Discussion

109.	What is the use of the OUT1 and OUT2 pins?(a) Input(b) Output(c) Activation(d) Power inputI had been asked this question during an interview.My doubt stems from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right choice is (b) Output To ELABORATE: The OUT1 and OUT2 pins are used to CONTROL the MOTORS that are connected to the IC. They accept up to 5V USUALLY if the module has a 5V rating.

Discussion

110.	How many pins are present in the Relay (Dual Channel) Module?(a) 12(b) 220(c) 13(d) 50I got this question in examination.My question is taken from Relay (Dual Channel) Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct answer is (c) 13 To explain: The Relay (DUAL CHANNEL) Module has 13 pins which includes the 2 Vcc’s, 2 GND’s, IN1 and IN2 which are the two input channels, 2 NC’s, 2 NO’s and 2 COM’s. All these pins have very specific functions and input patterns which need to be connected in perfect order in order for the module to function properly.

Discussion

111.	What is the use of the EN3_4 pin?(a) Input(b) Output(c) Activation(d) Power inputI have been asked this question during an internship interview.This key question is from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct ANSWER is (c) Activation The explanation is: The EN3_4 PIN is used to enable a part of the IC which CONTROLS a segment of the motors connected to it. They accept 5V usually if the module has a 5V RATING.

Discussion

112.	What is the use of the Relay (Dual Channel) Module?(a) Monitors Motion(b) Evaluates air pressure(c) Monitors objects(d) Switches circuitsI had been asked this question in an interview for internship.Enquiry is from Relay (Dual Channel) Module in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT choice is (d) Switches circuits To explain: The Relay (Dual CHANNEL) Module is used for controlling a CIRCUIT by one signal or when many circuits MUST be controlled by one signal. Thus making it a primarily SWITCHING device.

Discussion

113.	What kind of sensor is the LDR Sensor?(a) Passive(b) Active(c) Radio(d) Pressure basedThe question was posed to me in an interview.My doubt stems from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct option is (a) Passive The EXPLANATION: The LDR sensor is a passive sensor since it requires no EXTERNAL supply of voltage in order for it to work. It simply acts as a VARIABLE RESISTOR and changes the resistance of itself while light of varying intensity falls on it.

Discussion

114.	How many pins are present in the MPU6050 Sensor?(a) 1(b) 4(c) 8(d) 5This question was posed to me during an interview.My question comes from MPU6050 Sensor Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right answer is (b) 4 Best explanation: The MPU 6050 SENSOR has 8 pins which includes the Vcc, GND, INT, AD0, XCL, XDA, SDA, and SCL. All these pins have very specific functions and INPUT patterns which NEED to be connected in PERFECT order in order for the sensor to function properly.

Discussion

115.	How many pins are present in the GSR Sensor?(a) 1(b) 4(c) 10(d) 5The question was asked in an online quiz.Query is from GSR Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» CORRECT answer is (b) 4 Easiest explanation: The GSR Sensor has 4 pins. These are the Vcc for powering the sensor, GND for completing the CIRCUIT, and SIG and NC being the data pins.

Discussion

116.	What is the use of the ADXL-335 sensor?(a) To measure acceleration(b) To measure heat(c) To measure temperature(d) To measure GPS LocationI have been asked this question in an internship interview.This is a very interesting question from ADXL335 Accelerometer Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» CORRECT answer is (a) To measure acceleration To explain I would say: The ADXL-335 is an accelerometer which can calculate the instantaneous acceleration. It can be used for many applications, most importantly in phones, since it can be ALSO used for CALCULATING the roll or TILT.

Discussion

117.	How much time on an average does the LDR take for it’s resistance to change when light is incident?(a) 8 to 12 ms(b) 12 min(c) 30 s(d) 354 hrThe question was posed to me in quiz.The question is from LDR Sensor in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT option is (a) 8 to 12 ms To explain I would say: 8 to 12ms is the correct value of the TIME that an average LDR takes for its resistance to CHANGE in response to the light incident on it. It also takes about a second APPROXIMATELY for the resistance to rise back up to its initial value when no light is incident.

Discussion

118.	How many pins are present in the OV7670 Camera Module?(a) 18(b) 10(c) 8(d) 50The question was posed to me in homework.The query is from OV7076 Camera Module in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» RIGHT choice is (a) 18 To EXPLAIN I would say: The OV7670 CAMERA Module has 18 pins which includes the Vdd for Power supply, GND for grounding, SDIOC for SCCB clock, SDIOD for SCCB data, VSYNC for Vertical Sync, HREF for Horizontal Sync, PCLK for Pixel Clock, XCLK for System Clock, D0 to D7 pins are for Video output, RESET for resetting the module, and PDWN for POWERING down the module.

Discussion

119.	What is the datatype of the output given by the temperature module on the MPU 6050?(a) Signed Double(b) Unsigned Byte(c) Signed Int(d) Unsigned FloatI have been asked this question in examination.This intriguing question comes from MPU6050 Sensor Module in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct ANSWER is (c) Signed Int The explanation: The temperature module gives US a signed integer in ORDER to DEPICT the current temperature. This helps because then we can have the full RANGE of both the positive and the negative temperature scale.

Discussion

120.	How many pins are present in the ADXL-335?(a) 1(b) 4(c) 2(d) 5I had been asked this question in final exam.The question is from ADXL335 Accelerometer Sensor in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right answer is (d) 5 For explanation: The ADXL-335 Accelerometer has 5 pins which correspond to VCC for powering the DEVICE, GND for COMPLETING the circuit, and X,Y,Z pins which give the sensor’s output to be calculated with the help of a microcontroller.

Discussion

121.	What is the optimum current that is required to operate the Ultrasonic Sensor?(a) 20 mA(b) 15 mA(c) 200 A(d) 1 AI had been asked this question in homework.My question is from Ultrasonic Sensor in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right OPTION is (b) 15 mA The best explanation: The current rating on any SENSOR is given so that users can know the what is the optimum current that needs to be fed to the active sensor such that the internal ELECTRONICS is not DESTROYED by excess current.

Discussion

122.	What mode should we put the Arduino pin to, for object detection to work with the IR Sensor?(a) Analog(b) Digital(c) PCM(d) TDMThe question was asked during an online exam.The query is from IR Sensor in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct choice is (b) Digital For explanation: Having the input pin to digital on the Arduino, will give us a HIGH signal from the SENSOR whenever an object is detected to be in range of the sensor thus FULFILLING its need. So, for object detection we can ATTAIN the REQUIRED data simply by a digital HIGH or LOW signal.

Discussion

123.	What happens to the NO1 and NO2 pins when INT1 and INT2 is HIGH?(a) Gets connected to COM(b) Gets disconnected from COM(c) Gets connected to Vcc(d) Gets connected to GNDThe question was asked in final exam.My doubt is from Relay (Dual Channel) Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct option is (B) Gets disconnected from COM Easy explanation: A disconnected COM port gives the correct VALUE of the STATE of the NO1 and NO2 pins when 5V or logical HIGH signal is fed to the INT1 and INT2 pins. Conversely they also get connected to the COM when INT1 and INT2 pins are set to LOW.

Discussion

124.	Do LDR’s respond to all wavelengths of light?(a) Yes(b) NoThe question was asked by my school teacher while I was bunking the class.This interesting question is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct choice is (b) No The BEST I can explain: LDR’s are non LINEAR devices. Their SENSITIVITY varies with the WAVELENGTH of light that’s incident on them. Some LDR’s might not response to a certain range of wavelengths at all depending upon the KIND of material used in different devices, which consequently have different spectral response curves.

Discussion

125.	What mode should the 3 axis pins of the ADXL-335 be read in, in an Arduino in order to obtain meaningful values?(a) Analog(b) Digital(c) PCM(d) TDMThis question was posed to me during an interview for a job.My question is from ADXL335 Accelerometer Sensor topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT choice is (a) Analog Explanation: The AXIS pins of the ADXL-335 Accelerometer give output in the form of analog signals. These should then be READ from the Arduino with the HELP of the “analogRead()” method so as to obtain the full voltage VALUE that they are putting out.

Discussion

126.	What will happen if we supply a voltage of 25V to the Vcc of the GSR Sensor?(a) Damage is caused(b) Module will shut down(c) Module will not respond for the time the voltage is applied(d) Module will function normallyI have been asked this question in my homework.My question is from GSR Sensor in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct option is (a) Damage is caused Explanation: The GSR Sensors are mostly built to work on a voltage RANGE of approximately 3.3V to 5V. Any voltage lower than that and the sensor will not be able to power on, but however any voltage SIGNIFICANTLY above that and the sensor MAY SUFFER permanent damage.

Discussion

127.	Which of the formulae give us the acceleration in the MPU 6050 along the X axis?(a) Acceleration along the X axis = (Accelerometer X axis raw data/16384) g(b) Acceleration along the X axis = (Accelerometer X axis raw data/1634) g(c) Acceleration along the X axis = (Accelerometer X axis raw data/1384) g(d) Acceleration along the X axis = (Accelerometer X axis raw data/1622) gThis question was posed to me by my college professor while I was bunking the class.The query is from MPU6050 Sensor Module in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct answer is (a) Acceleration ALONG the X AXIS = (Accelerometer X axis raw data/16384) g Easiest EXPLANATION: (Accelerometer X axis raw data/16384) gives the correct value of the acceleration of the MPU 6050 sensor. Here all the three values read from the 3 data pins of the Accelerometer module in the MPU 6050 are to be replaced in the equation one by one in order to get the 3D MODEL.

Discussion

128.	How many pins are present in the IR Sensor?(a) 1(b) 3(c) 2(d) 4The question was asked in an interview for internship.I need to ask this question from IR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right CHOICE is (b) 3 To elaborate: The pins that are PRESENT on the IR Sensor include, the GROUND, the Vcc and the Signal pins. The role of the Ground and the Vcc is to power the sensor. The Vcc ACCEPTS a maximum VOLTAGE of approximately 5V. The signal pin is present to convey the data from the sensor to the microcontroller or the microprocessor.

Discussion

129.	Which port on any Arduino board should be connected to the Key Port on the Adafruit FONA 3G+GPS Breakout?(a) Any Digital Pin(b) Vcc(c) Gnd(d) Any Analog PinThis question was posed to me during an interview.My question is from Adafruit FONA 3G+GPS Breakout topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct choice is (C) Gnd The explanation: TheAdafruit FONA 3G+GPS Breakout’s Key pin should be always connected to the Gnd Pin on any Arduino Board. This pin provides the function of the power on/off INDICATOR. When you would like to shutdown the board, CONNECT the pin to the Gnd of the Arduino Board for about 3 to 5 seconds. However for prolonged use usage of theAdafruit FONA 3G+GPS Breakout ONE needs to permanently connect this pin to the Gnd of the Arduino.

Discussion

130.	What is the type of waves that the ESP8266 WiFi Module detects?(a) Infrared Signal(b) Radio Signal(c) VL Signal(d) Hybrid SignalThe question was posed to me in a job interview.My question comes from OV7076 Camera Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right option is (C) VL Signal Explanation: The OV7670 Camera MODULE detects light WAVE patterns which fall in the visible spectrum, that is approximately 700 nm. This is roughly the light waves which are ALSO visible to the naked human eye.

Discussion

131.	What mode does the ESP8266 WiFi Module switch to when fed the sequence 0 1 to its GPIO-0 and GPIO-2 Pins?(a) UART Mode(b) Sleep Mode(c) Active Mode(d) Flash ModeThe question was posed to me in an online interview.The query is from ESP8266 Wifi Module in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT answer is (a) UART Mode Best explanation: UART Modegives the correct combination of input NEEDED for the module to program using Arduino or any SERIAL communication supplied to it externally.

Discussion

132.	What is the use of the IN1 and IN2 pin?(a) Input(b) Output(c) Ground(d) Power inputThis question was addressed to me in exam.Query is from Relay (Dual Channel) Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right option is (a) Input Best explanation: The IN1 and IN2 respectively are used for sending DIGITAL inputs to the MODULE. They ACCEPT 5V usually if the module has a 5V rating. Some modules also come with a 3.3V rating so it is important to check the rating of the module to be used.

Discussion

133.	What is the use of the LDR Sensor?(a) Monitors Motion(b) Monitors air pressure(c) Monitors Light Intensity(d) Monitors heartbeatI have been asked this question at a job interview.This is a very interesting question from LDR Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct ANSWER is (c) Monitors Light Intensity Best explanation: An LDR Sensor is used to measure the light intensity of the space surrounding it. Similar variations of these KINDS of sensors are used in phones which allow manufacturers to turn off the screen when you place your phone to your ear during a CALL.

Discussion

134.	What is the use of the GSR Sensor?(a) Monitors electrodermal activity(b) Monitors skin capacitance(c) Monitors skin temperature(d) Monitors heartbeatThis question was posed to me during an interview.My question is taken from GSR Sensor in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» RIGHT answer is (a) Monitors electrodermal activity The BEST I can explain: The GSR Sensor stands for Galvanic SKIN Response Sensor. This sensor can monitor the electrical conductance or the electrodermal activity and help us CLASSIFY the emotion of a person.

Discussion

135.	Does the OV7670 Camera Module support Lens Shading Correction?(a) Yes(b) NoI have been asked this question in examination.This key question is from OV7076 Camera Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct answer is (a) Yes To EXPLAIN I WOULD say: Lens SHADING correction helps SOFTWARE remove image structures that originate in the imaging system and don’t belong to the actual image information HENCE giving drastically more accurate images.

Discussion

136.	What will happen if we supply a voltage of 250 kV to the Vcc of the L293D module?(a) Damage is caused(b) Module will shut down(c) Module will not respond for the time the voltage is applied(d) Module will function normallyThis question was posed to me in an online quiz.My question is based upon Motor Driver (L293D) and Motors topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct choice is (a) DAMAGE is caused For explanation: The L293D modulesare mostly built to work on a voltage of approximately 5V. Any voltage LOWER than that and the module will not be able to power on, but however any voltage significantly above that and the SENSOR MAY suffer PERMANENT damage.

Discussion

137.	How many pins are present in the Motor Driver (L293D) Module?(a) 12(b) 16(c) 13(d) 50I had been asked this question in exam.The question is from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right choice is (B) 16 Easiest EXPLANATION: The L293D Motor Driver Module CONTAINS 16 pins which include 4 GND pins, 4 Vcc pins, 4 Output pins, 2 Enabling pins and 2 Voltage pins. All these pins have very specific functions and input patterns which need to be connected in perfect order in order for the module to function properly.

Discussion

138.	What is the formula for calculating the temperature in degrees celsius from the raw data gathered by the temperature module of the MPU 6050?(a) Temperature in degrees celsius = ((temperature sensor data)/340 + 36.53) °/c(b) Temperature in degrees celsius = ((temperature sensor data)/340 + 36) °/c(c) Temperature in degrees celsius = ((temperature sensor data) + 36.53) °/c(d) Temperature in degrees celsius = ((temperature sensor data)/340 * 36.53) °/cI got this question in my homework.The query is from MPU6050 Sensor Module in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» RIGHT CHOICE is (a) Temperature in degrees celsius = ((temperature sensor data)/340 + 36.53) °/c Explanation: ((temperature sensor data)/340 + 36.53) °/c GIVES the correct value of the temperature recorded by the MPU 6050 sensor. This is in the form of a signed int so as to DENOTE negative temperatures too thus giving us the FULL range.

Discussion

139.	What will happen if we supply a voltage of 25V to the Vcc of the Nokia 5110 GDM?(a) Damage is caused(b) Module will shut down(c) Module will not respond for the time the voltage is applied(d) Module will function normallyThe question was asked in homework.The query is from Nokia 5110 Graphical Display Module topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct answer is (a) DAMAGE is caused Best EXPLANATION: The NOKIA 5110 Graphical Display Modules are mostly built to work on a voltage range of approximately 3.3V to 5V. Any voltage lower than that and the sensor will not be able to power on, but however any voltage significantly above that and the sensor may SUFFER permanent damage.

Discussion

140.	How many pins are present in the Ultrasonic Sensor?(a) 1(b) 3(c) 2(d) 4This question was posed to me in an interview for internship.This intriguing question originated from Ultrasonic Sensor topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct answer is (d) 4 For explanation: The pins that are present on the ULTRASONIC SENSOR include, the Ground, the Vcc and the Signal pins. The role of the Ground and the Vcc is to power the sensor. The Vcc ACCEPTS a maximum voltage of approximately 5V. The signal pins; Trigger and Echo are present to detect the OBSTACLE and convey the data from the sensor to the microcontroller or the microprocessor.

Discussion

141.	What is the use of the Adafruit FONA 3G+GPS Breakout?(a) To measure luminosity of something(b) To provide 3G Connectivity(c) To measure temperature(d) To measure Wi-Fi strengthI got this question in quiz.This intriguing question originated from Adafruit FONA 3G+GPS Breakout topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Correct option is (b) To provide 3G Connectivity Easy explanation: TheAdafruit FONA 3G+GPS BREAKOUT is a module that provides 3G network connectivity for all kinds of embedded SYSTEMS. It also has provisions for GPS tracking for providing on BOARD GEOLOCATION capabilities.

Discussion

142.	What happens when the sequence 1 1 1 is fed to the IN3, IN4 and EN3_4 pins respectively?(a) Clockwise Motor Rotation(b) Anticlockwise Motor Rotation(c) Stops Motor Rotation(d) Stalls Motor RotationI got this question in quiz.My doubt stems from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right choice is (C) Stops Motor ROTATION Best EXPLANATION: Stopping motor rotation altogether gives the correct logic sequence which enables the micro-controller to stop ONE SET of motors. This is true for the other set too.

Discussion

143.	What is the use of the TX pin?(a) Upload(b) Download(c) Ground(d) Power inputI got this question in a national level competition.My enquiry is from ESP8266 Wifi Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right option is (a) Upload To ELABORATE: The TX pin is used for connecting to RX pin of programmer micro-controllerto upload the PROGRAM usually. It can also be used as a GENERAL purpose Input/output pin.

Discussion

144.	What is the use of the EN1_2 pin?(a) Input(b) Output(c) Activation(d) Power inputThe question was asked in an internship interview.This question is from Motor Driver (L293D) and Motors in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct answer is (c) Activation For EXPLANATION: The EN1_2 pin is used to enable a PART of the IC which controls a SEGMENT of the MOTORS connected to it. They ACCEPT 5V usually if the module has a 5V rating.

Discussion

145.	What will happen if we supply a voltage of 250 kV to the terminal of the LDR Sensor?(a) Damage is caused(b) Module will shut down(c) Module will not respond for the time the voltage is applied(d) Module will function normallyI have been asked this question in an online interview.The doubt is from LDR Sensor in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT answer is (a) Damage is caused Explanation: The LDR Sensors are mostly built to work on a voltage range that is not too high and should not be used for high power USAGE as it will BURN up. Any voltage lower than that and the sensor will not be able to power on, but however any voltage significantly above that and the sensor may SUFFER PERMANENT damage.

Discussion

146.	How many pins are present in the LDR Sensor?(a) 1(b) 4(c) 2(d) 5I have been asked this question at a job interview.Question is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» Right OPTION is (C) 2 Easy explanation: The LDR is a PASSIVE sensor, which means it does not require any external voltage SUPPLY for it to run. So it only has two terminals which are to be connected in parallel for maximum performance and so that if the LDR becomes defunct, it does not affect the working of the entire circuit.

Discussion

147.	If 1 means an object is detected and 0 meaning no object is detected, then considering the sensor is stationary, what can be said about the movement of the object if the output by the sensor is 111000?(a) Object is stationary(b) Object is oscillating side by side(c) Object is continuously moving away(d) Object is continuously moving closerThe question was posed to me in final exam.My question is based upon IR Sensor in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The CORRECT answer is (c) Object is continuously moving away For explanation I WOULD say: The only explanation for such output from the SENSOR would be if the object is moving in such a path, that after a few CYCLES, the object becomes out of range of the sensor, THUS implying that it is moving away continuously from the sensor.

Discussion

Explore topic-wise InterviewSolutions in .

How many pins are present in the ESP8266 WiFi Module?(a) 12(b) 10(c) 8(d) 50I have been asked this question during an interview.This question is from ESP8266 Wifi Module topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

What kind of sensor is the GSR Sensor?(a) Passive(b) Active(c) Radio(d) Pressure basedI got this question in an online interview.This question is from GSR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the Vcc2 pin?(a) Input(b) Output(c) Activation(d) Power inputI have been asked this question in semester exam.The query is from Motor Driver (L293D) and Motors topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the OUT1 and OUT2 pins?(a) Input(b) Output(c) Activation(d) Power inputI had been asked this question during an interview.My doubt stems from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the Relay (Dual Channel) Module?(a) 12(b) 220(c) 13(d) 50I got this question in examination.My question is taken from Relay (Dual Channel) Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the EN3_4 pin?(a) Input(b) Output(c) Activation(d) Power inputI have been asked this question during an internship interview.This key question is from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

What kind of sensor is the LDR Sensor?(a) Passive(b) Active(c) Radio(d) Pressure basedThe question was posed to me in an interview.My doubt stems from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the MPU6050 Sensor?(a) 1(b) 4(c) 8(d) 5This question was posed to me during an interview.My question comes from MPU6050 Sensor Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the GSR Sensor?(a) 1(b) 4(c) 10(d) 5The question was asked in an online quiz.Query is from GSR Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

How much time on an average does the LDR take for it’s resistance to change when light is incident?(a) 8 to 12 ms(b) 12 min(c) 30 s(d) 354 hrThe question was posed to me in quiz.The question is from LDR Sensor in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the OV7670 Camera Module?(a) 18(b) 10(c) 8(d) 50The question was posed to me in homework.The query is from OV7076 Camera Module in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the ADXL-335?(a) 1(b) 4(c) 2(d) 5I had been asked this question in final exam.The question is from ADXL335 Accelerometer Sensor in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the optimum current that is required to operate the Ultrasonic Sensor?(a) 20 mA(b) 15 mA(c) 200 A(d) 1 AI had been asked this question in homework.My question is from Ultrasonic Sensor in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

What mode should we put the Arduino pin to, for object detection to work with the IR Sensor?(a) Analog(b) Digital(c) PCM(d) TDMThe question was asked during an online exam.The query is from IR Sensor in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

Do LDR’s respond to all wavelengths of light?(a) Yes(b) NoThe question was asked by my school teacher while I was bunking the class.This interesting question is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the IR Sensor?(a) 1(b) 3(c) 2(d) 4The question was asked in an interview for internship.I need to ask this question from IR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the IN1 and IN2 pin?(a) Input(b) Output(c) Ground(d) Power inputThis question was addressed to me in exam.Query is from Relay (Dual Channel) Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

Does the OV7670 Camera Module support Lens Shading Correction?(a) Yes(b) NoI have been asked this question in examination.This key question is from OV7076 Camera Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the Motor Driver (L293D) Module?(a) 12(b) 16(c) 13(d) 50I had been asked this question in exam.The question is from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the Ultrasonic Sensor?(a) 1(b) 3(c) 2(d) 4This question was posed to me in an interview for internship.This intriguing question originated from Ultrasonic Sensor topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the TX pin?(a) Upload(b) Download(c) Ground(d) Power inputI got this question in a national level competition.My enquiry is from ESP8266 Wifi Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

What is the use of the EN1_2 pin?(a) Input(b) Output(c) Activation(d) Power inputThe question was asked in an internship interview.This question is from Motor Driver (L293D) and Motors in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

How many pins are present in the LDR Sensor?(a) 1(b) 4(c) 2(d) 5I have been asked this question at a job interview.Question is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino