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WorksheetsSensors and Transducers Quiz
Total questions: 20
Worksheet time: 10mins
What is the working principle of ultrasonic sensors?
They emit sound waves and measure the time it takes for them to return.
They detect infrared radiation.
They use light to measure distances.
They rely on heat changes to detect objects.
What are the advantages of ultrasonic sensors?
Non-contact measurement and versatility.
High cost and limited range.
Only suitable for smooth surfaces.
Requires physical contact with objects.
What is the formula for calculating distance using ultrasonic sensors?
Distance = Speed * Time
Distance = Time / Speed
Distance = Speed + Time
Distance = Speed - Time
What is the primary function of an IR sensor?
To detect infrared radiation.
To measure distances using sound.
To convert light into electrical signals.
To emit ultrasonic waves.
What are the types of IR sensors?
Active and passive infrared sensors.
Ultrasonic and laser sensors.
Optical and thermal sensors.
Mechanical and electrical sensors.
What is a photodiode?
A device that converts light energy into electric current.
A type of infrared sensor.
A mechanical device for measuring distances.
A type of ultrasonic sensor.
What is the conventional current flow direction in a diode under forward bias condition?
From anode to cathode
From cathode to anode
What are the types of photodiodes mentioned?
PN Photodiode
PIN Photodiode
Avalanche Photodiode
Schottky Photodiode
What is the main feature of a PIN photodiode compared to a PN photodiode?
Higher sensitivity
Lower capacitance
Both A and B
What is the working principle of a photodiode?
It generates current when light strikes
It amplifies current
It stores energy
What applications are photodiodes commonly used for?
Smoke detectors
Televisions
Medical applications
All of the above
What is the main difference between a phototransistor and a photodiode?
Phototransistor can amplify current
Photodiode is faster
Phototransistor is less sensitive
What is the effect of reverse bias on a photodiode?
Increases capacitance
Decreases response time
Increases depletion layer width
What is the main difference between a phototransistor and a normal transistor?
Phototransistor requires voltage at the base terminal.
Phototransistor does not require voltage at the base terminal.
Phototransistor has three terminals.
Phototransistor operates on a different principle.
What are the two terminals of a phototransistor?
Emitter and Collector
Base and Collector
Emitter and Base
Source and Drain
What are the two types of phototransistors?
BJT and FET
NPN and PNP
Silicon and Germanium
Active and Passive
What is the main principle behind the operation of a phototransistor?
Photovoltaic effect
Thermal effect
Magnetic effect
Capacitive effect
What is the response time of a phototransistor compared to a photodiode?
Faster
Slower
Equal
Variable
What is a photodarlington pair?
A phototransistor connected to another transistor.
A type of photodiode.
A circuit with multiple phototransistors.
A single phototransistor.
What is the main application of phototransistors?
Punch-card readers.
High voltage applications.
Mechanical switches.
Analog circuits.
