WorksheetsUnit 3
Total questions: 8
Worksheet time: 8mins
What is the principle of operation of a PN junction diode?
It conducts only when reverse biased.
It conducts only when forward biased.
It conducts under both forward and reverse bias.
It does not conduct under any condition.
Which of the following components is NOT part of the block diagram of a DC power supply?
Transformer
Rectifier
Zener diode
Filter
What is the role of the transformer in a DC power supply?
To regulate the output voltage
To convert AC voltage to DC
To step up or step down the AC voltage
To convert the DC output to AC
In a full-wave bridge rectifier, how many diodes are used?
1
2
3
4
What is the purpose of a capacitor filter in a rectifier circuit?
To convert DC to AC
To smooth the pulsating DC output
To reduce the current
To increase the voltage
What is the main application of a Zener diode?
To act as a rectifier
To regulate voltage in a circuit
To amplify signals
To store energy
Which of the following is the main purpose of a 78xx series voltage regulator?
To increase the voltage
To provide a fixed positive voltage output
To step up the current
To rectify AC voltage
What is the function of the 79xx series voltage regulators?
To provide a fixed negative voltage output
To provide a fixed positive voltage output
To regulate current
To filter the output voltage
