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Free download in PDF LED Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
Intrinsically _________________ are a very linear device.
[A]
Injection lasers
[B]
DH lasers
[C]
Gain-guided
[D]
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
(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
(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
(8)
What is 1,000p?
[A]
0.01n
[B]
0.0001u
[C]
0.1n
[D]
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
(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%
(13)
The number "104" on a capacitor indicates:
[A]
0.1u
[B]
100n
[C]
1n
[D]
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
(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
(19)
1,200mV is equal to:
[A]
12v
[B]
1.2v
[C]
0.12v
[D]
0.0012v
(20)
1mA is equal to:
[A]
0.001A
[B]
0.00001A
[C]
0.01A
[D]
0.1A
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