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WorksheetsLesson 3 - Diode Theory & Rectification Quiz
Total questions: 10
Worksheet time: 5mins
What happens in forward bias for a silicon diode?
Current is blocked completely
Diode starts conducting once threshold is reached
It behaves like a resistor
It emits light
What is reverse bias?
Anode positive, current flows
Cathode positive, current blocked
Diode destroyed instantly
Same as forward bias
What is the approximate forward voltage drop for a silicon diode?
0.1 V
0.3 V
0.7 V
1.2 V
In a half-wave rectifier circuit, what part of the AC waveform is passed?
Both positive and negative halves
Only the negative half
Only the positive half
Neither half
What does the DC output from a half-wave rectifier look like?
Smooth constant DC
Pulsed DC (gaps)
Pure AC sine wave
Square wave
Which of these is a common rectifier diode?
1N4148
LED
1N4001
Zener
What effect does adding a capacitor (filter) have to a rectified output?
Increases ripple
Smooths the output ⇒ reduces ripple
Changes waveform to pure AC
Blocks DC
How is average DC voltage (Vdc) of a half-wave rectified sine related to peak voltage (Vp)?
Vdc ≈ 0.5 × Vp
Vdc ≈ 0.707 × Vp
Vdc ≈ 0.318 × Vp
Vdc ≈ 1.273 × Vp
What could cause a measured DC voltage to be lower than theoretical in a rectifier circuit?
Diode voltage drop
Inaccurate oscilloscope calibration
Ripple under load
All of the above
Why is diode polarity important?
To show which side lights up
To ensure current flows only when expected
To make the circuit look correct
Polarity doesn’t matter
