Prepare for your Electronics and Communication Engineering exams/aptitude tests, assess your knowledge of electronics and communication equipment with these ECE questions and answers.
Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Correct answer is A
At 20°C, 4 nA, at 30°C, 8 nA, at 40°C, 16 nA, at 50°C, 32 nA.
The types of carriers in a semiconductor are
1
2
3
4
Correct answer is B
Holes and electrons.
In a degenerate n type semiconductor material, the Fermi level
is in valence band
is in conduction band
is at the centre in between valence and conduction bands
is very near valence band
Correct answer is B
This is due to high level of doping.
Secondary emission is always decremental.
True
False
Cannot say
It depends
Correct answer is B
No explanation has been provided for this answer.
In a bipolar transistor, which current is largest
collector current
base current
emitter current
base current or emitter current
Correct answer is C
Emitter current is larger, collector current is slightly less than emitter current and base current is very small.
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