Electronic Devices Mock Tests

A Zener diode voltage regulator has a Zener voltage of 6 V, a series resistance of 250 Ω, and an input voltage of 10 V. The load resistance is 1 kΩ. The current through the Zener diode is:

In a common emitter transistor amplifier, the collector resistance is 2 kΩ and the base resistance is 500 Ω. If the voltage drop across the collector resistance is 4 V and the current gain β = 100, the voltage gain of the amplifier is:

A transistor has current gain α = 0.95 in common base mode. The current gain β in common emitter mode is:

In a common emitter transistor amplifier, the input resistance is 1 kΩ and the load resistance is 5 kΩ. The current gain β = 50. The voltage gain is:

A photodiode is operated in reverse bias because:

In a logic circuit, the output of a NOR gate is fed into a NOT gate. The equivalent single gate is:

A Zener diode with breakdown voltage 6 V is used as a voltage regulator in a circuit with a supply voltage of 10 V and a series resistor of 1 kΩ. The Zener diode is connected in parallel with a load resistor of 2 kΩ. The current through the Zener diode is:

A Zener diode with breakdown voltage 5.6 V is used as a voltage regulator. If the input voltage varies between 7 V and 10 V and the Zener current must not exceed 100 mA, the maximum value of the series resistor R is: