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Study MCQ
Electronics Mechanic
OPTO ELECTRONICS
Set 4
Set 4
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Q4388
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Which is the combination of photo transistor?
A
LASER diode and pin diode
B
Photo transistor and DIAC
C
Photo diode and transistor
D
Photo resistor and TRIAC
Q4389
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What is the advantage of photo transistors over photo diodes?
A
Considerably lower sensitivity
B
Limit voltage handling capacity
C
Considerable greater sensitivity
D
Vulnerable to electrical sources
Q4390
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What is the use of photo transistor?
A
Used in comparator circuit
B
Used as light controlled switch
C
Used as oscillator
D
Used as demodulator
Q4391
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What is the drawbacks of LDR?
A
More sensitive
B
Available different sizes and specifications
C
Cannot be used to determine precise light levels
D
Made of low resistance material with few holes
Q4392
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Which material is used to make photo resistors (LDR)?
A
Silicon
B
Germanium
C
Aluminium
D
Cadmium sulfide
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