In a CE amplifier the input impedance is equal to the ratio of ac base voltage t

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Question
In a CE amplifier the input impedance is equal to the ratio of
Options
A. ac base voltage to ac base current
B. ac base voltage to ac emitter current
C. ac emitter voltage to ac collector current
D. ac collector voltage to ac collector current

Correct Answer

ac base voltage to ac base current

Explanation

Input is applied to base with emitter grounded. The input impedance is the ratio of ac base voltage to ac base current.

More questions

3. Assertion (A): Inter-digitated geometry is widely used for microwave transistors.
Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

6. A line has Z₀ = 300 ? 0° ?. If Z_L = 150 ? 0° ?, reflection coefficient is
Options
A. 0.5
B. 0.3333
C. -0.3333
D. -0.5

8. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
Options
A. must be isolated
B. may or may not be isolated
C. should be preferably, isolated
D. should not be isolated

9. In a ripple counter,
Options
A. whenever a flip flop sets to 1, the next higher FF toggles
B. whenever a flip flop sets to 0, the next higher FF remains unchanged
C. whenever a flip flop sets to 1, the next higher FF faces race condition
D. whenever a flip flop sets to 0, the next higher FF faces race condition

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