LED Quiz | LED Objective Type Questions and Answers

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Questions
21 The current in a circuit is 45mA. This is:
A 0.045Amp
B 0.00045A
C 0.0045A
D 0.45A

Answer: 0.045Amp
22 To obtain a higher value of resistance, resistors are connected in:
A Reverse
B Forward
C Parallel
D Series

Answer: Series
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23 A 10k resistor in parallel with 10k produces:
A 10k
B 5k
C 20k
D Cannot be determined

Answer: 5k
24 What does LED stand for?
A Light Emitting Display
B Low Energy Display
C Light Emitting Diode
D Light Emitting Detector

Answer: Light Emitting Diode
25 A 100n capacitor in parallel with 10n produces:
A 90n
B 100n
C 110n
D Cannot be determined

Answer: 110n
26 The InGaAsP is emitting LEDs are realized in terms of restricted
A Length strip geometry
B Radiance
C Current spreading
D Coupled optical power

Answer: Length strip geometry
27 The active layer of E-LED is heavily doped with
A Zn
B Eu
C Cu
D Sn

Answer: Zn
28 Connecting a lead from the negative to the positive of a battery will produce:
A A high resistance circuit
B A short circuit
C A low current path
D An open circuit

Answer: A short circuit
29 What is the approximate characteristic voltage that develops across a red LED?
A 1.7v
B 3.4v
C 0.6v
D All the above

Answer: 1.7v
30 If two resistors are placed in series, is the final resistance:
A Higher
B Lower
C The same
D Cannot be determined

Answer: Higher
31 If the voltage on the base of a transistor increases, does it:
A Turn on
B Turn off
C Not enough information
D Remain the same

Answer: Not enough information
32 If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:
A The same
B Higher
C Lower
D All above

Answer: Higher
33 Which is not a "common" value of resistance?
A 2k7
B 1M8
C 330R
D 4k4

Answer: 4k4
34 A resistor with colour bands: red-red-red-gold, has the value:
A 22k 5%
B 2k2 5%
C 220R 5%
D 22R 5%

Answer: 2k2 5%
35 Mesa structured SLEDs are used
A To reduce radiance
B To increase radiance
C To reduce current spreading
D To increase current spreading

Answer: To reduce current spreading
36 The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber
A 0.03
B 0.05
C 0.3
D All of the above

Answer: 0.03
37 Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 μWof optical power launched into multimode step index fiber.
A 1.256*10-5
B 4.417*102
C 4.25*10-3
D 2.14*10-3

Answer: 4.25*10-3
38 Internal absorption in DH surface emitter Burros type LEDs is
A Cannot be determined
B Negligible
C High
D Very low

Answer: Very low
39 DH surface emitter generally give
A More coupled optical power
B Less coupled optical power
C Low current densities
D Low radiance emission into-fiber

Answer: More coupled optical power
40 In a multimode fiber, much of light coupled in the fiber from an LED is
A Increased
B Reduced
C Lost
D Unaffected

Answer: Lost

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