GATE Electrical – Analog Electronics
Practice Problems – Page 3
This section contains numerical problems based on Rectifiers and Diode Circuits.
Problem 21
Question:
A half wave rectifier has an input peak voltage of 20 V. Find the average DC output voltage.
Solution:
Vdc = Vm / π
Vdc = 20 / 3.14
Vdc ≈ 6.37 V
Problem 22
Question:
A full wave rectifier has an input peak voltage of 30 V. Find the average output voltage.
Solution:
Vdc = 2Vm / π
Vdc = (2 × 30) / 3.14
Vdc ≈ 19.1 V
Problem 23
Question:
Find the peak inverse voltage (PIV) of a half wave rectifier if the peak voltage is 50 V.
Answer:
PIV = Vm = 50 V
Problem 24
Question:
Find the peak inverse voltage of a center-tapped full wave rectifier if peak voltage is 40 V.
Answer:
PIV = 2Vm
PIV = 2 × 40 = 80 V
Problem 25
Question:
What is the peak inverse voltage of a bridge rectifier if input peak voltage is 60 V?
Answer:
PIV = Vm = 60 V
Problem 26
Question:
If ripple factor of a half wave rectifier is 1.21, what does it indicate?
Explanation:
It indicates that the AC component in the output is greater than the DC component.
Problem 27
Question:
A diode has a forward resistance of 10 Ω and load resistance is 1 kΩ. Find rectification efficiency approximately.
Answer:
Efficiency decreases slightly due to diode resistance but remains close to theoretical value.
≈ 40%
Problem 28
Question:
What is the transformer utilization factor (TUF) of a bridge rectifier?
Answer:
TUF ≈ 0.812
Problem 29
Question:
Which rectifier provides the highest DC output voltage?
Answer:
Full wave rectifier.
Problem 30
Question:
Why is a filter used after a rectifier?
Answer:
To reduce ripple and produce smoother DC output.
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