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WorksheetsHA - Unit - I TYPES OF SENSORS
Total questions: 20
Worksheet time: 10mins
Which one of the following sensors is used for the automatic door opening system?
a) PIR
b) Ultrasonic
c) Temperature
d) Gas sensor
The operating principle of infrared sensors is ______________?
a) Doppler effect
b) Raman effect
c) Pyroelectric effect
d) Fluoresce effect
Which type of lens is generally used in the PIR sensors?
a) Concave lens
b) Convex lens
c) Bifocal lens
d) Fresnel Lens
The distance range of detection of the PIR sensor is ________
a) 5-10 cm
b) 5-7 m
c) Up to 12 m
d) 5-12 cm
PIR sensor detects the ________ of a person or object when it comes in close proximity
a) Distance
b) Heat
c) Location
d) Range
What is the use of the LDR Sensor?
a) Monitors motion
b) Monitors air pressure
c) Monitors light intensity
d) Monitors heartbeat
Photoconductivity is an optical phenomenon in which the material’s conductivity is increased when ________ is absorbed by the material.
a) Heat
b) Light
c) Motion
d) Sound
What is the frequency range of the ultrasonic sound waves used by the ultrasonic sensors?
a) 20000Hz to 25000Hz
b) 25KHz to 50KHz
c) 25Hz to 55Hz
d) 25Hz to 50Hz
Which of the following is the formula is used for calculating the distance (L) in ultrasonic sensors, where T – time and C – wave speed
a) L = T/2 × C
b) L = 1/2 × (T / C)
c) L = 1/2 × (C / T)
d) L = 1/2 × (T × C)
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 1010101?
a) Object is stationary
b) Object is oscillating side by side
c) Object is continuously moving away
d) Object is continuously moving closer
Thermocouple works on:
a) Peltier effect
b) Kelvin effect
c) Thomson effect
d) Seebeck effect
A ________ is thermally sensitive resistor that exhibits a large change in resistance.
a) Thermistor
b) Resistance Thermometer
c) Thermo couple
d) Semiconductor based sensor
The oxygen sensor signal is based on the amount of oxygen in the ________ gas.
a) Pressurized
b) Exhaust
c) Recirculating
d) Heated
A smoke sensor function is to detect ________.
I. Smoke II. Gas III. Fire IV. Temperature
a) I and II only
b) I, II and III only
c) II, III and IV only
d) I, II and IV only
MQ2 type sensor detection is based upon change of __________ of the sensing material
a) Capacitance
b) Temperature
c) Resistance
d) Sound
_________ is the most important material being sensitive towards combustible gases
a) Tin oxide
b) Carbon dioxide
c) Aluminium oxide
d) Zinc oxide
The main application of rain sensor is ___________
a) Irrigation system
b) Automotive system
c) Safety system
d) Warming system
Modern touch sensors applications are built with ______ type of touch sensor.
a) Capacitive
b) Resistive
c) Inductive
d) Magnetic
Which one of the following is not a method of transduction in tactile sensing
a) Piezoelectric
b) Piezoresistive
c) Capacitive
d) Magnetic
Which one of the following is not an advantages of capacitive touch sensor
a) More robust
b) High cost
c) Durable
d) User friendly
