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Electronic Devices and Circuits: Small Signal Amplifiers
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Electronic Devices and Circuits: Small Signal Amplifiers
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25 Questions

1. Which of the following represents the correct mathematical form of the term denoted by the symbol Rp?
2. A radio receiver has how many stages of amplification?
3. Which of the following is true?
4. In a bipolar transistor at room temperature, the emitter current is doubled the voltage across its base emitter junction_________
5. What should be the level of input resistance to allow the occurrence of source loading in common base amplifier configuration?
6. A common emitter transistor amplifier has a collector current of 10mA, when its base current is 25µA at the room, temperature. What is input resistance?
7. The voltage gain is practically expressed in _______
8. Consider an NMOS transistor having kn= 2 mA/V2. Let the transistor be biased at VOV = 1V. For operation in saturation, what dc bias current ID results? If a +0.1-V signal is superimposed on VGS, find the corresponding increment in collector current by evaluating the total collector current ID and subtracting the dc bias current ID.
9. A transistor is connected in CB configuration. The emitter voltage is changed by 200mV, the emitter by 5mA. During this transition the collector base voltage is kept constant. What is the input dynamic resistance?
10. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________
11. The frequency response of transformer coupling is ________
12. The configuration in which output impedance of transistor amplifier is highest is ___________
13. 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.
14. Which type of amplifiers exhibits the current gain approximately equal to unity without any current amplification?
15. Why is the Darlington configuration not suitable for more than two transistors?
16. A transistor has hfe=100, hie=2kΩ, hoe=0.005mmhos, hre=0. Find the output impedance if the lad resistance is 5kΩ.
17. Why is RC coupling confined to low power applications?
18. A CE amplifier when bypassed with a capacitor at the emitter resistance has
19. What should be the gain of an amplifier at 20 kHz if the half power frequencies are fL = 20 Hz and fH = 15 kHz along with mid band gain = 80?
20. A transistor with ß = 120 is biased to operate at a dc collector current of 1.2 mA. Find the value of gm.
21. The feature of an approximate model of a transistor is
22. Gain of an amplifier usually expressed in db because _______________
23. Which of the following statements are correct for basic transistor configurations?
24. 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?
25. The collector current is 2.945A and α=0.98. The leakage current is 2µA. What is the emitter current and base current?

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