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51
Which one of the following is not LED material?
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Answer: Option D
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52
When donor atoms are added to semiconductor, it
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Answer: Option D
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53
In a p-n-p transistor biased in the active region, in the n-type base, holes
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Answer: Option B
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54
In transistor, if electrons flow into emitter,
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Answer: Option A
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55
Energy band gap of an insulating materials is:
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Answer: Option B
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56
Effectively, how many valence electrons are there in each atom within a silicon crystal?
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Answer: Option B
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57
Which of the following are essentials of a transistor biasing circuit?
1. Proper zero signal collector current flow
2. VCE should not fall below 0.5 V for Germanium and 1 V for Silicon
3. Ensure stabilization of operating point
4. Loading to the source
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Answer: Option A
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58
Which one of the following is the exact expression for ICEO (i.e. collector to emitter current with base open) in a junction transistor?
(Where ICBO is the collector to base current with emitter open, and α is the common base current gain)
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Answer: Option C
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59
The light output of LED varies as (Current)n, the value of n is about
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Answer: Option C
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60
Which one of the following expressions may be used to correctly describe the temperature (T) variation of the intrinsic carrier density (ni) of a semiconductor?
Eg is the band gap, A is pre-factor's k is Boltzmann constant.
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Answer: Option D
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