Semiconductor Diode(Engineering > Electrical Engineering ) Questions and Answers
Question 1. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ___________ biased.
forward
reverse
either forward or reverse
none of the above
Explanation:-
Answer: Option A. -> forward
Question 2. In the breakdown region, a zener didoe behaves like a ___________ source.
constant voltage
constant current
constant resistance
none of the above
Explanation:-
Answer: Option A. -> constant voltage
Question 3. When the crystal current diode current is large, the bias is ___________
forward
inverse
poor
reverse
Explanation:-
Answer: Option A. -> forward
Question 4. If the temperature of a crystal diode increases, then leakage current ___________
remains the same
decreases
increases
becomes zero
Explanation:-
Answer: Option C. -> increases
Question 5. The d.c. resistance of a crystal diode is ___________ its a.c. resistance
the same as
more than
less than
none of the above
Explanation:-
Answer: Option C. -> less than
Question 6. For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
twice
thrice
four time
one-half
Explanation:-
Answer: Option D. -> one-half
Question 7. The disadvantage of a half-wave rectifier is that the___________
components are expensive
diodes must have a higher power rating
output is difficult to filter
none of the above
Explanation:-
Answer: Option C. -> output is difficult to filter
Question 8. A crystal diode is used as ___________
an amplifier
a rectifier
an oscillator
a voltage regulator
Explanation:-
Answer: Option B. -> a rectifier
Question 9. A zener diode is used as ___________
an amplifier
a voltage regulator
a rectifier
a multivibrator
Explanation:-
Answer: Option B. -> a voltage regulator
Question 10. A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop.