Special Diodes – 2 – 8

86. The varactor is usually :

(a) forward-biased
(b) reverse-biased
(c) unbiased
(d) in the breakdown region

87. Zener diodes are used primarily as :

(a) amplifiers
(b) voltage regulators
(c) rectifiers
(d) oscillators

88. A pn junction that radiates energy as light instead of as heat is called a :

(a) LED
(b) photo-diode
(c) photocell
(d) Zener diode

89. The capacitance of a varactor diode increases when reverse voltage across it :

(a) decreases
(b) increases
(c) breaks down
(d) stores charge

90. The device associated with voltage-controlled capacitance is a :

(a) LED
(b) photo-diode
(c) varactor diode
(d) Zener diode

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