26. The UJT may be used as ……………………
(a) an amplifier
(b) a sawtooth generator
(c) a rectifier
(d) none of the above
27. 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
28. After peak point, the UJT operates in the …………………… region.
(a) cut-off
(b) saturation
(c) negative resistance
(d) none of the above
29. 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
30. The triac is ……………………
(a) like a bidirectional SCR
(b) a four-terminal device
(c) not a thyristor
(d) answers (a) and (b)
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Power Semiconductor Devices » Exercise - 1 25. The device that exhibits negative resistance region is ........................ (a) diac (b) triac (c) transistor (d) UJT- Power Semiconductor Devices » Exercise - 1 9. The device that does not have the gate terminal is ............ (a) triac (b) FET (c) SCR (d) diac
- Power Semiconductor Devices » Exercise - 1 27. 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
- Power Semiconductor Devices » Exercise - 1 16. When the emitter terminal of a UJT is open, the resistance between the base terminals is generally ............ (a) high (b) low (c) extremely low (d) none of the above
- Power Semiconductor Devices » Exercise - 1 28. After peak point, the UJT operates in the ........................ region. (a) cut-off (b) saturation (c) negative resistance (d) none of the above