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Electronic Mechanic Practice Test: Transistor Amplifier
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Electronic Mechanic Practice Test: Transistor Amplifier
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25 Questions

1. Why NPN type of transistors are preferred over the PNP type transistors?
2. What is the input impedance of darlington pair transistors?
3. Why transistors made of silicon is preferred over the germanium semiconductor material?
4. How does the values of bias resistors selected for collector current in class -B amplifiers?
5. Which class of amplifier uses fixed bias because of its imperent advantage of transistor will never go to saturation?
6. What is the efficiency transformer coupled class A amplifier?
7. What is the formula used to calculate the current gain (α) of common base amplifier?
8. What is the maximum emitter to base voltage VEB (max) for the transistor BC 147?
9. What will happen when the forward bias voltage across the PN junction is increased excessively?
10. What is the voltage drop across the collector and emitter of transistor Q1?
11. What is the status of the transistor in the circuit?
12. What is the value of RE if the voltage across it is 1.2 V and current flowing through it is 10mA?
13. Which test is conducted to check the basic operation of a transistor?
14. What is the type of amplifier configuration?
15. What is the name of multi-stage amplifiers?
16. What is the advantage of using bias in transistor circuits?
17. Which methods of coupling used in the transistor amplifier circuit shown?
18. What causes the drop in gain at high frequencies of an RC coupled amplifier frequency response curve?
19. What is the purpose of using positive feedback in amplifiers?
20. Which type of amplifier is used to operate the loud speaker?
21. What is the current gain of common collector amplifier?
22. Which transistor characteristics gives the curve plotted against VBE versus IB as shown?
23. Which coding system for transistor type numbering system is followed by American standard?
24. How much is the voltage drop across the load resistor R2 in the circuit?
25. What is the electrode marked ‘X’ in the TO-12 transistor pack diagram shown?

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