LED MCQs | LED Multiple Choice Questions and Answers

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Questions
1 Intrinsically _________________ are a very linear device.
A Injection lasers
B DH lasers
C Gain-guided
D LEDs

Answer: LEDs
2 The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature.
A Exponentially, decreasing
B Exponentially, increasing
C Linearly, increasing
D Linearly, decreasing

Answer: Exponentially, increasing
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3 To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important.
A Low-internal efficiency
B High-internal efficiency
C High-power potential
D Low-power potential

Answer: High-power potential
4 For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________
A 2.1 to 2.75 μm, increase
B 1.1 to 1.7 μm, increase
C 2.1 to 3.6 μm, decrease
D 3.5 to 6 μm, decrease

Answer: 1.1 to 1.7 μm, increase
5 4 resistors in ascending order are:
A 22R 270k 2k2 1M
B 4k7 10k 47R 330k
C 3R3 4R7 22R 5k6
D 100R 10k 1M 3k3

Answer: 3R3 4R7 22R 5k6
6 Name the three leads of a common transistor
A Collector Bias Omitter
B Base Collector Case
C Emitter Collector Bias
D Collector Base Emitter

Answer: Collector Base Emitter
7 A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:
A 5k5
B 35,200 ohms
C 55k
D None of the above

Answer: 35,200 ohms
8 What is 1,000p?
A 0.01n
B 0.0001u
C 0.1n
D 1n

Answer: 1n
9 A 100n capacitor can be expressed as:
A 0.1u u = microfarad
B 0.01u
C 0.001u
D All the above

Answer: 0.1u u = microfarad
10 If a 10k resistor is placed across a 10v supply, the current will be:
A 10mA
B 1mA
C 0.01mA
D 0.1mA

Answer: 1mA
11 A CRO is a
A Cathode Ray Oscillator
B Cathode Ray Oscilloscope
C Capacitor-Resistor Oscillator
D Capacitor-Resistor Output

Answer: Cathode Ray Oscilloscope
12 The tolerance bands: gold; silver; brown, represent:
A 10%, 5%, 1%
B 5%, 10%, 2%
C 5%, 10%, 1%
D 10%, 5%, 2%

Answer: 5%, 10%, 1%
13 The number "104" on a capacitor indicates:
A 0.1u
B 100n
C 1n
D A & B (Both)

Answer: A & B (Both)
14 The current requirement of a LED is:
A 1.7mA
B 25mA
C Between 3 and 35mA
D 65mA

Answer: Between 3 and 35mA
15 Arrange these in ascending order: n, p, u
A p, u, n,
B n, u, p
C p, n, u
D None of these

Answer: p, n, u
16 223 on a capacitor represents:
A 0.022u u = microfarad
B 22n n = nanofarad
C 22,000p p = picofarad
D All of the above

Answer: 22n n = nanofarad
17 These jargon terms mean: (Jargon = language peculiar to a 'mickey' 'electro' 'cap' 'puff'; trade)
A mighty, electronic, capper, picofarad
B microfarad, electronic, capacitor, picofarad
C microfarad, electrolytic, capacitor, picofarad
D microfarad, electrolyte, capping, blow

Answer: microfarad, electrolytic, capacitor, picofarad
18 A DC voltage . . .
A rises and falls
B is a sinewave
C remains constant
D is an audio waveform

Answer: remains constant
19 1,200mV is equal to:
A 12v
B 1.2v
C 0.12v
D 0.0012v

Answer: 1.2v
20 1mA is equal to:
A 0.001A
B 0.00001A
C 0.01A
D 0.1A

Answer: 0.001A

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