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paper of Electronics sensors Manipal

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Paper of sensors in Electronics

Course=Electronics
Subject=sensors

Question no-1
If we apply 90v Ac 50 Hz on the below device then


sensors
Optional Answers

(a)                  Offers 3183 ohms of impedance

(b)                  Pass 28.2mA current

(c)                  Capacitor will be damaged

Sollution

(c)                  Capacitor will be damaged

Question no-2
Heart beat sensor reads heart beat from finger tip


Optional Answers

(a)                  Works on the principle of light modulation by blood flow

(b)                  Works on the principle of electrical signal by blood flow

(c)                  Get electrical signal from skin

(d)                  None of the above

Sollution

(a)                  Works on the principle of light modulation by blood flow

Question no-3
Global Positioning System module communicates with controller using


Optional Answers

(a)                  USB communication

(b)                  NMEA protocol

(c)                  I2C communication

(d)                  SPI communication

Sollution

(b)                  NMEA protocol

Question no-4
Load cell measures


Optional Answers

(a)                  Mass of body

(b)                  Weight of body

(c)                  Temperature in atmosphere

(d)                  Density of body

Sollution

(b)                  Weight of body

Question no-5
Load cell gives output in the range of


Optional Answers

(a)                  Voltages

(b)                  Micro Volts

(c)                  Kilo Voltages

(d)                  KHz

Sollution

(b)                  Micro Volts

Question no-6
Peltier cooler can be used for


Optional Answers

(a)                  Heating of any object

(b)                  Generate frequency

(c)                  Measure preasure

(d)                  Generate sound

Sollution

(a)                  Heating of any object

Question no-7
Piezoelectric material can be use to


Optional Answers

(a)                  Sensor to measure weight

(b)                  Sensor to generate sound

(c)                  Both measure weight and generate sound

(d)                  None of the above

Sollution

(c)                  Both measure weight and generate sound

Question no-8
Three terminal 72XX integrated circuit works on


Optional Answers

(a)                  Peltier effect

(b)                  Thermal effect

(c)                  Hall effect

(d)                  none of the above

Sollution

(c)                  Hall effect

Question no-9
MQ6 is used as a


Optional Answers

(a)                  circuit for amplification

(b)                  LPG sensor

(c)                  Temperature sensor

(d)                  Noise Detector

Sollution

(b)                  LPG sensor

Question no-10
TSOP 1738 works with


Optional Answers

(a)                  30Khz

(b)                  10 Volts

(c)                  TV remote

(d)                  none of the above

Sollution

(c)                  TV remote

Question no-11
Read Switch works on


Optional Answers

(a)                  Magnetic field

(b)                  Electric field

(c)                  Atmospheric preasure

(d)                  none of the above

Sollution

(a)                  Magnetic field

Question no-12
Accuracy of DHT11 in terms of temperature


Optional Answers

(a)                  1 degree celsius

(b)                  2 degree celsius

(c)                  3 degree celsius

(d)                  4 degree celsius

Sollution

(b)                  2 degree celsius

Question no-13
HMC5883 is a


Optional Answers

(a)                  Is digital compass communicates based on I2C communication

(b)                  Is digital compass communicates based on SPI communication

(c)                  Is temperature sensor based on CAN

(d)                  None of the above

Sollution

(a)                  Is digital compass communicates based on I2C communication

Question no-14
Metal detector works on the principle


Optional Answers

(a)                  Thermal induction

(b)                  Electromagnetic induction

(c)                  Radiations

(d)                  none of the above

Sollution

(b)                  Electromagnetic induction

Question no-15
Sensor MQ3 is use to detect


Optional Answers

(a)                  Carbon dioxide

(b)                  LPG

(c)                  Alcohol

(d)                  Humidity

Sollution

(c)                  Alcohol

Question no-16
PIR sensor works on


Optional Answers

(a)                  Infra red radiation

(b)                  Magnetic fields

(c)                  Electric fields

(d)                  none of the above

Sollution

(a)                  Infra red radiation

Question no-17
PWM using P89V51RD2 can be generate


Optional Answers

(a)                  using Programmable counter array

(b)                  Using delay functions

(c)                  a and b both

(d)                  none of the above

Sollution

(c)                  a and b both

Question no-18
To measure distance using ultrasonic sensor


Optional Answers

(a)                  Give a pulse(generates ultrasonic wave) and calculate time when it bounce back

(b)                  Just give 15v supply

(c)                  Ultrasonic sensor can not measure distance

(d)                  It only send ultrasonic waves

Sollution

(a)                  Give a pulse(generates ultrasonic wave) and calculate time when it bounce back

Question no-19
Send SMS Command using GSM


Optional Answers

(a)                  AT+CMGS

(b)                  AT+CMGC

(c)                  AT+CMCG

(d)                  AT+CMGF

Sollution

(a)                  AT+CMGS

Question no-20
Brush less DC motor require in quadrotor because


Optional Answers

(a)                  It is cheap

(b)                  consumes very less current

(c)                  its RPM is high compared to stepper and DC

(d)                  we can also use other motors

Sollution

(c)                  its RPM is high compared to stepper and DC

Jai guru dev

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