Net Beta and Darlington Pair Concepts

The video tutorial explains the Darlington pair transistor, highlighting its ability to achieve high current gains by connecting two NPN transistors. It provides a step-by-step guide on designing the pair, calculating individual and overall current gains, and deriving the formula for net beta. The tutorial emphasizes the significant increase in current gain when using a Darlington pair compared to individual transistors.

What is the primary advantage of using a Darlington pair transistor?

• Low power consumption

• High current gain

• Reduced size

• Increased voltage gain

How are the two NPN transistors connected in a Darlington pair?

• Base of Q1 to emitter of Q2

• Base of Q1 to collector of Q2

• Emitter of Q1 to base of Q2

• Collector of Q1 to emitter of Q2

If the current gain of the first transistor is 100 and the second is 200, what is the net current gain of the Darlington pair?

• 100

• 200

• 20,300

• 300

What is the base current of the first transistor if the base current entering the Darlington pair is 0.01 milliamps?

• 10 milliamps

• 1 milliamp

• 0.01 milliamps

• 100 milliamps

How do you calculate the collector current of the first transistor in a Darlington pair?

• Emitter current times beta of Q1

• Base current times beta of Q1

• Base current times beta of Q2

• Collector current times beta of Q2

What is the formula for calculating the net beta of a Darlington pair?

• Beta1 + Beta2 + (Beta1 * Beta2)

• Beta1 * Beta2

• Beta1 - Beta2

• Beta1 + Beta2

In the derivation of the net beta formula, what is the relationship between IB2 and IE1?

• IB2 is unrelated to IE1

• IB2 is double of IE1

• IB2 is equal to IE1

• IB2 is half of IE1

What is the net beta if Beta1 is 100 and Beta2 is 200?

• 300

• 20,000

• 20,300

• 200

Which of the following is true about the net current gain of a Darlington pair?

• It is always less than the sum of individual gains

• It is the average of individual gains

• It is the product of individual gains

• It is significantly higher than individual gains

What is the significance of the derived formula for net beta in practical applications?

• It decreases the efficiency of the circuit

• It increases the size of the circuit

• It reduces the cost of components

• It simplifies the design process