8. A din, has ___ pn junctions.
A. four
B. two
C. three
D. none of the above

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9. The device that does not have the gate terminal is
A. triac
B.FET
C. SCR
D. diac

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10.  A diAc has ____ semiconductor layers.
A. three
B. two
C. four
D. none of the above

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11.  A UJT has
A. two pn junctions
B. one pn junction
C. three pn junctions
D. none of the above

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12. The normal way to turn on a diac is by
A. gate current
B. gate voltage
C. breakover voltage
D. none of the above

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13. A diac is ____ switch.
A. an a.c.
B. a d.c.
C. a mechanical
D. none of the above

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14.  In a UJT, the p.type emitter is ____ doped.
A. lightly
B. heavily
C. moderately
D. none of the above

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