GATE Electrical – Analog Electronics
Practice Problems – Page 2
This section contains practice problems based on PN Junction Diode, Rectifiers and Amplifier Fundamentals.
Problem 11
Question:
What is the reverse saturation current of a diode mainly caused by?
Answer: Minority carriers.
Explanation:
In reverse bias condition, current is caused by minority carriers moving across the junction.
Problem 12
Question:
Which type of diode is commonly used in voltage regulation circuits?
Answer: Zener diode
Explanation:
Zener diodes operate in reverse breakdown region and maintain constant voltage across the load.
Problem 13
Question:
What is the ripple frequency of a full wave rectifier if the input AC frequency is 50 Hz?
Solution:
Ripple Frequency = 2f
= 2 × 50
= 100 Hz
Problem 14
Question:
What is the maximum efficiency of a half wave rectifier?
Answer:
40.6%
Explanation:
Half wave rectifiers conduct only during one half of the AC cycle.
Problem 15
Question:
What is the maximum efficiency of a full wave rectifier?
Answer:
81.2%
Problem 16
Question:
What is the ripple factor of a full wave rectifier?
Answer:
0.482
Problem 17
Question:
What is the ripple factor of a half wave rectifier?
Answer:
1.21
Problem 18
Question:
Which amplifier configuration has the highest input impedance?
Answer: Common Collector (Emitter Follower)
Problem 19
Question:
Which amplifier configuration has the highest voltage gain?
Answer: Common Emitter amplifier
Problem 20
Question:
Write the formula for thermal voltage.
Answer:
VT = kT / q
At room temperature:
VT ≈ 25 mV
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