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Free download in PDF LED and LCD TV 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)
The full form of LCD is ____________
[A]
Logical Crystalline Display
[B]
Liquid Crystalline Display
[C]
Logical Crystal Display
[D]
Liquid Crystal Display
Answer: Liquid Crystal Display
(2)
By which properties, the orientation of molecules in a layer of liquid crystals can be changed?
[A]
Electric field
[B]
Gallois field
[C]
Electromagnetic field
[D]
Magnetic field
(3)
The direction of electric field in an LCD is determined by ___________
[A]
Quantum Cellular Automata
[B]
Crystalline surface structure
[C]
Molecular Orbital Theory
[D]
the molecule’s chemical structure
Answer: the molecule’s chemical structure
(4)
LCDs operate from a frequency ranges from ___________
[A]
30Hz to 60Hz
[B]
50Hz to 70Hz
[C]
10Hz to 60Hz
[D]
None of these
(5)
What is backplane in LCD?
[A]
For adjusting the intensity of the LCD
[B]
The dc voltage applied between segment and a common element
[C]
The amount of power consumed
[D]
The ac voltage applied between segment and a common element
Answer: The ac voltage applied between segment and a common element
(6)
The reverse bias in the semiconducting devices will
[A]
Make the potential barrier zero
[B]
Not affect the potential barrier
[C]
Decrease the potential barrier
[D]
Increase the potential barrier
Answer: Increase the potential barrier
(7)
MOSFET is
[A]
A voltage-driven device
[B]
A power driven device
[C]
A low input impedance
[D]
A current-driven device
Answer: A voltage-driven device
(8)
Which of the following device is the best for improving switching speeds of bipolar transistors?
[A]
Clamping diode with zero storage time
[B]
Clamping diode
[C]
Speed-up capacitor
[D]
Transistor with higher cut-off frequency
Answer: Clamping diode with zero storage time
(9)
Which of the following displays has minimum power consumption?
[A]
Liquid crystal display (LCD)
[B]
Light emitting diode (LED)
[C]
Fluorescent
[D]
Nixie tubes
Answer: Liquid crystal display (LCD)
(10)
The output offset of an operational amplifier is attributed to
[A]
An input current offers
[B]
An input-voltage offset
[C]
Either (a) or (b)
[D]
None of these
Answer: Either (a) or (b)
(11)
Which of the following is the most negative (or least positive) electrode is the electron gun?
[A]
Cathode
[B]
Control grid G1
[C]
Focus grid
[D]
Screen grid
(12)
Most of the electrons in the beam flow out of which terminal?
[A]
Ultor or anode
[B]
Cathode
[C]
Ultor
[D]
Anode
(13)
In which method in a G3 voltage of 200 V. used for?
[A]
high-voltage focus
[B]
low-voltage focus
[C]
either low or high voltage focus
[D]
none of these
Answer: low-voltage focus
(14)
Small magnets embedded in the yoke housing is correct for ____________.
[A]
pinoushion distortion
[B]
magnetic deflection
[C]
yoke position
[D]
centering adjustments
Answer: pinoushion distortion
(15)
In color picture tube, degaussing is done with .
[A]
60 Hz alternating current
[B]
alternating current
[C]
direct current
[D]
90 Hz alternating current
Answer: 60 Hz alternating current
(16)
In color picture tube, what does a solid red raster checked for?
[A]
Resetting the yoke
[B]
Convergence
[C]
Degaussing
[D]
good color purity
Answer: good color purity
(17)
Where do the small, white dots in the picture used for?
[A]
convergence
[B]
Resetting the yoke
[C]
good color purity
[D]
Degaussing
(18)
Where the permanent magnets used?
[A]
resetting the yoke
[B]
dynamic convergence
[C]
automatic degaussing
[D]
static convergence
Answer: static convergence
(19)
In picture, the basic waveform for dynamic convergence is the ____________.
[A]
parabola or half of sine wave
[B]
full sine wave
[C]
parabola
[D]
half a sine wave
Answer: parabola or half of sine wave
(20)
MOSFETs are suitably used where source resistance ranges from
[A]
10 to 100 MΩ
[B]
A few ohms to thousand ohms
[C]
100 MΩ and above
[D]
Milliohms to a few ohms
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