56. When used as switch, a Schottky transistor switches between :
(a) Cut-off and active regions
(b) Cut-off and saturation regions
(c) Active and saturation regions
(d) Different operation points in the active region
57. A transistor has ……..
(a) one pn junction
(b) two pn junctions
(c) three pn junctions
(d) four pn junctions
58. The number of depletion layers in a transistor is ……..
59. The base of a transistor is ……. doped.
(d) none of the above
60. The element that has the biggest size in a transistor is ……..
(d) collector-base junction
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