Semiconductors; semiconductor diode — I-V characteristics in forward and reverse bias; diode as a rectifier; LED, photodiode, solar cell; Zener diode and its application as voltage regulator; transistor action; logic gates (OR, AND, NOT, NAND, NOR).
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Q1 · Electronic Devices · EASY
A p-n junction diode has a forward resistance of 25 Ω and infinite reverse resistance. If the diode is connected in series with a 975 Ω resistor and a 10 V battery, what is the current through the circuit when the diode is forward biased?
Q2 · Electronic Devices · MEDIUM
In a half-wave rectifier circuit using a p-n junction diode, the input AC voltage has a peak value of 20 V and frequency 50 Hz. Assuming ideal diode behaviour, what is the average DC output voltage?
Q3 · Electronic Devices · MEDIUM
A Zener diode with a breakdown voltage of 6 V is used in a voltage regulator circuit. The input voltage is 12 V and a series resistance of 300 Ω is connected. If the load resistance is 600 Ω, what is the current through the Zener diode?
Q4 · Electronic Devices · EASY
Which of the following logic gate combinations is equivalent to a NAND gate?
Q5 · Electronic Devices · HARD
A common emitter transistor amplifier has a current gain (β) of 100. If the base current is 50 μA and the load resistance is 2 kΩ, what is the change in collector voltage when the base current changes by 10 μA? (Assume the transistor operates in active region)