Linear Opto Isolator multiple choice questions
Linear Opto Isolator
1. A device which is made of isolators and follows a closed loop path is called as a ____
a) Circulator
b) Gyrator
c) Attenuator
d) Connector
Answer: Circulator
2. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.
a) Fiber slice
b) Optical fiber connector
c) Optical isolator
d) Optical coupler
Answer: Optical isolator
3. Magneto-optic devices can be used to function as isolators.
a) True
b) False
Answer: True
4. A combination of a FBG and optical isolators can be used to produce non-blocking optical wavelength division add/draw multiplexers.
a) True
b) False
Answer: False
5. How many implementation methods are available for optical isolators?
a) One
b) Four
c) Two
d) Three
Answer: Three
6. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33μm.
a) 0.51 μm
b) 0.58 μm
c) 0.61 μm
d) 0.49 μm
Answer: 0.51 μm
7. The commercially available circulators exhibit insertion losses around ____________
a) 2 dB
b) 0.7 dB
c) 0.2 dB
d) 1 dB
Answer: 1 dB
8. Which feature of an optical isolator makes it attractive to use with optical amplifier?
a) Low loss
b) Wavelength blocking
c) Low refractive index
d) Attenuation
Answer: Wavelength blocking
9. A phototransistor produces more current than a photodiode because
a) the phototransistor can be more heavily doped than the photodiode.
b) the photo transistor accepts a wider spectrum of light than the photodiode.
c) the current produced by photons is amplified by the hfe of the transistor.
d) the photodiode is normally used in low light conditions.
Answer: the current produced by photons is amplified by the hfe of the transistor.
10. Which of the following operation modes do photo proximity detectors normally use?
a) Linear Mode.
b) Saturation Mode.
c) Analogue Mode.
d) Direct Mode.
Answer: Saturation Mode.
11. An optocoupler having a maximum input current (IF) of 50mA is chosen to be driven by a current of 20mA. Which of the following answers would be a valid reason for this?
a) To allow for input surge currents.
b) To reduce input noise.
c) To allow for LED ageing.
d) To allow for the occurrence of voltage spikes at the input.
Answer: To allow for LED ageing.
12. Compared to a photo-diode, which of the listed advantages and disadvantages would be expected of a photo-transistor
a) Faster response and greater sensitivity.
b) Faster response and less sensitivity.
c) Slower response and greater sensitivity.
d) Slower response and less sensitivity
Answer: Slower response and greater sensitivity
a) Circulator
b) Gyrator
c) Attenuator
d) Connector
Answer: Circulator
2. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.
a) Fiber slice
b) Optical fiber connector
c) Optical isolator
d) Optical coupler
Answer: Optical isolator
3. Magneto-optic devices can be used to function as isolators.
a) True
b) False
Answer: True
4. A combination of a FBG and optical isolators can be used to produce non-blocking optical wavelength division add/draw multiplexers.
a) True
b) False
Answer: False
5. How many implementation methods are available for optical isolators?
a) One
b) Four
c) Two
d) Three
Answer: Three
6. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33μm.
a) 0.51 μm
b) 0.58 μm
c) 0.61 μm
d) 0.49 μm
Answer: 0.51 μm
7. The commercially available circulators exhibit insertion losses around ____________
a) 2 dB
b) 0.7 dB
c) 0.2 dB
d) 1 dB
Answer: 1 dB
8. Which feature of an optical isolator makes it attractive to use with optical amplifier?
a) Low loss
b) Wavelength blocking
c) Low refractive index
d) Attenuation
Answer: Wavelength blocking
9. A phototransistor produces more current than a photodiode because
a) the phototransistor can be more heavily doped than the photodiode.
b) the photo transistor accepts a wider spectrum of light than the photodiode.
c) the current produced by photons is amplified by the hfe of the transistor.
d) the photodiode is normally used in low light conditions.
Answer: the current produced by photons is amplified by the hfe of the transistor.
10. Which of the following operation modes do photo proximity detectors normally use?
a) Linear Mode.
b) Saturation Mode.
c) Analogue Mode.
d) Direct Mode.
Answer: Saturation Mode.
11. An optocoupler having a maximum input current (IF) of 50mA is chosen to be driven by a current of 20mA. Which of the following answers would be a valid reason for this?
a) To allow for input surge currents.
b) To reduce input noise.
c) To allow for LED ageing.
d) To allow for the occurrence of voltage spikes at the input.
Answer: To allow for LED ageing.
12. Compared to a photo-diode, which of the listed advantages and disadvantages would be expected of a photo-transistor
a) Faster response and greater sensitivity.
b) Faster response and less sensitivity.
c) Slower response and greater sensitivity.
d) Slower response and less sensitivity
Answer: Slower response and greater sensitivity
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