Electronic Devices and Circuits Online Quizzes - Section 10

1. The feature of an approximate model of a transistor is

1. It helps in dc analysis
2. AC analysis is not possible
3. It helps in quicker analysis
4. It provides individual analysis for different configurations

2. A transistor has hfe=100, hie=2kΩ, hoe=0.005mmhos, hre=0. Find the output impedance if the lad resistance is 5kΩ.

1. 3kΩ
2. 9kΩ
3. 5kΩ
4. 4kΩ

3. A transistor has hie =2kΩ, hoe=25µmhos and hfe=60 with an unbypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance?

1. 63kΩ and 40kΩ respectively
2. 6kΩ and 40kΩ respectively
3. 33kΩ and 45kΩ respectively
4. 90kΩ and 50kΩ respectively

4. A CE amplifier when bypassed with a capacitor at the emitter resistance has

1. Increased input resistance and decreased voltage gain
2. Decreased input resistance and increased voltage gain
3. Decreased input resistance and decreased voltage gain
4. Increased input resistance and increased voltage gain

5. A transistor has hie =1KΩ and hfe=60 with an bypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance?

1. 33kΩ and 45kΩ respectively
2. 6kΩ and 40kΩ respectively
3. 63kΩ and 40kΩ respectively
4. 90kΩ and 50kΩ respectively

6. In the given circuit, find the equivalent resistance between A and B nodes.

                                                         

1. 1000kΩ
2. 80kΩ
3. 65kΩ
4. 50kΩ

7. Which of the following acts as a buffer?

1. CB amplifier
2. cascaded amplifier
3. CC amplifier
4. CE amplifier

8. Which of the following is true?

1. CE amplifier has a large current gain
2. CB amplifier has low voltage gain
3. CC amplifier has low current gain
4. CC amplifier has a large current gain

9. In an NPN silicon transistor, α=0.995, IE=10mA and leakage current ICBO=0.5µA. Determine ICEO.

1. 90µA
2. 10µA
3. 100µA
4. 500µA

10. In CB configuration, the value of α=0.98A. A voltage drop of 4.9V is obtained across the resistor of 5KΩ when connected in collector circuit. Find the base current.

1. 0.02mA
2. 0.05mA
3. 0.07mA
4. 0.01mA