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ECE Objective Questions { Bipolar Junction Transistor }

8. Statement-2 large change in collector voltage is required to produce large change in collector current Key
A. only statement 1 is correct
B. only statement 2 is correct
C. both statements 1 and 2 are correct
D. neither statement 1 nor 2 is correct

9. Which statement about CE configuration is false?
A. its power gain is the best
B. it is the only configuration which provides phase inversion
C. its output resistance is very high
D. it is the only circuit which has voltage and current gains higher than unity.

10. Each of the following statements regarding CC configuration is true except
A. it is most suited to match a high impedance source to a low-impedance load
B. it is invariable employed where phase inversion of input signal is required
C. it is often used for circuit isolation purposes
D. since it can pass signal in either direction, it is also used for two-way amplifier and switching circuits

11. The output characteristics for a CB transistor consist of a family of curves plotted of
A. IC against VcB for different values of 1B
B. VcB against Ic for different values of IB
C. lc against VcB for different values of IE
D. lc against VcE for different values of IB

12. The active region of the output characteristics for a CB transistor is that in which
A. emitter is forward-biased but collector is reverse-biased
B. both emitter and collector are forward-biased
C. collector is forward-biased and emitter is reverse-biased
D. both emitter and collector are reverse-biased

13. Regarding active region of CB transistor output characteristics which statement is false?
A. the transistor is FR-biased
B. even when IE 0, lc 0* but equals 'CO
C. though essentially independent of VGB, lc increases slightly due to Early effect
D. value of IC is exactly equal to emitter current.

14. The set of transistor characteristics that enables a to be determined directly from the slope is
A. CE transfer characteristics
B. CE output characteristics
C. CB transfer characteristics
D. CB input characteristics

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