Special Diodes » Exercise – 2
51. In a PIN diode, the intrinsic layer sandwiched between the heavily doped P & N layers is :
(a) Heavily doped
(b) Lightly doped
(c) Very lightly doped
(d) Moderately dope
52. The tunnel effect was discovered in 1960 by :
(a) H.K. Onnes
(b) Deaver & Fairbank
(c) J. Bardeen
(d) Giaever
53. Zener breakdown results due to :
(a) Strong electric field across the junction
(b) Thermal decomposition
(c) Impact ionization
(d) Emission of free electrons
54. A crystal diode has ……..
(a) one pn junction
(b) two pn junctions
(c) three pn junctions
(d) none of the above
55. A crystal diode has forward resistance of the order of ……..
(a) k Ω
(b) Ω
(c) MΩ
(d) none of the above
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