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ECE Objective Questions { Power Semiconductor Devices and Their Applications }

22. Between the peak point and the valley point of UJT emitter characteristics we have ___ region.
A. saturation
B. negative resistance
C. cut-off
D. none of the above

23. A diac is turned on by
A. breakover voltage
B. gate voltage
C. gate current
D. none of the above

24. The device that exhibits negative resistance region is
A. disc
B. triac
C. transistor

25. The UJT may be used as
A. an amplifier
B. a sawtooth generator
C. a rectifier
D. none of the above

26. A diac is simply
A. a single junction device
B. a three junction device
C. a triac without gate terminal
D. none of the above

27. After peak point, the UJT operates in the ___ region.
A. cut-off
B. saturation
C. negative resistance
D. none of the above

28. Which of the following is not a characteristic of UJT?
A. intrinsic stand off ratio
B. negative resistance
C. peak-point voltage
D. bilateral conduction

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