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Electronics Mechanic
OPTO ELECTRONICS
Set 5
Set 5
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Q4393
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What is the main application of photo resistor?
A
Voltage rectification
B
Demodulation purpose
C
Controls of street lighting systems
D
To generate oscillations
Q4394
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Which purpose the cadmium sulfide cells (CDS cells) are used?
A
Primary cells
B
Rechargeable cells
C
Light dependent resistor
D
Voltage dependent resistor
Q4395
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How the light sensitive photo transistor enclosed inside a tight package is activated?
A
By the bias voltage to the photo transistor
B
By the external signal to the transistor
C
By IR light produced inside the package
D
By the light sensitive receiver inside
Q4396
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Which measuring instrument is used to check the working condition of a photo resistor (LDR)?
A
Oscilloscope
B
Voltmeter
C
Ohmmeter
D
Ammeter
Q4397
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Which electronic device inversely changes its resistance with the amount of light falling on it?
A
Photo diodes
B
Photo resistors
C
Photo transistors
D
Photo voltaic cells
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