Worksheets12 input devices Quiz
Total questions: 21
Worksheet time: 11mins
What type of peripheral input device is a proximity sensor?
Digital
Analogue
Hybrid
Optical
Which of the following is an example of an analogue peripheral input device?
Proximity sensor
Mechanical switch
Temperature transducer
Light sensor
What does a thermocouple do?
Converts temperature difference into electrical output
Converts electrical input into mechanical motion
Stores electrical energy
Displays temperature readings
What is a transducer generally used for?
To convert a signal from one form to a different physical form
To amplify electrical signals
To store digital data
To display visual information
What must be done to analog signals before they can be input to PLC ports?
Convert them to digital signals
Amplify them
Store them in memory
Display them on a screen
Which of the following is an issue that input sensors may face?
Durability
Accuracy
Cost
Size
Input sensors may have problems with which of the following?
Response time
Temperature
Material
Design
Which issue is related to the ability of input sensors to detect small changes?
Sensitivity
Speed
Volume
Shape
How are mechanical switches specified?
By the color of the switch
By the number of poles and throws
By the size of the switch
By the weight of the switch
What is the primary function of a limit switch?
To detect the presence or passage of a moving part
To control the speed of a motor
To measure temperature changes
To regulate electrical voltage
Which type of proximity switch is suitable only for metallic objects?
Optical switch
Eddy current type
Capacitive switch
Ultrasonic switch
What is a reed switch composed of?
Two overlapping strips of a springy ferromagnetic material
Two touching strips of a non-magnetic material
A single strip of a springy ferromagnetic material
Two overlapping strips of plastic
What is a common use for a reed switch?
To control lighting systems
To detect when a door is opened
To regulate temperature
To measure humidity
What type of switch can be used with both metallic and nonmetallic objects?
Inductive proximity switch
Capacitive proximity switch
Mechanical switch
Optical switch
How is the proximity of an object detected by a capacitive proximity switch?
By a change in temperature
By a change in capacitance
By a change in color
By a change in sound
What does the resistance of a photoconductive cell depend on?
Temperature
Humidity
Intensity of light
Pressure
What is a simple form of temperature sensor that provides an on/off signal when a particular temperature is reached?
Thermocouple
Bimetal element
Thermistor
Infrared sensor
What is a thermocouple primarily used for?
Measuring pressure
Measuring temperature
Measuring humidity
Measuring light intensity
What causes the capacitance to change in capacitive displacement sensors?
Change in temperature
Change in plate separation or overlap
Change in voltage
Change in current
What happens to the resistance of a wire or strip of semiconductor when it is stretched?
It remains the same.
It decreases.
It increases.
It becomes zero.
What happens when a piezoelectric crystal is squeezed?
It changes color
It emits light
It becomes charged
It melts
