Q.

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?

A. 90kΩ and 50kΩ respectively
B. 33kΩ and 45kΩ respectively
C. 6kΩ and 40kΩ respectively
D. 63kΩ and 40kΩ respectively
Answer» D. 63kΩ and 40kΩ respectively
Explanation: as the emitter is unbypassed, the input resistance ri=hie+(1+hfe)re
2.5k
0
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