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Special Diodes – 2 – 7

81. If the PIV rating of a diode is exceeded, ……..

(a) the diode conducts poorly
(b) the diode is destroyed
(c) the diode behaves as zener diode
(d) none of the above

ANSWER

EXPLANATION

82. Zener diodes are used primarily as :

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

ANSWER

EXPLANATION

83. 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

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION

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