169. The most widely used rectifier is
A. half-wave rectifier
B. centre-tap full-wave rectifier
C. bridge full-wave rectifier
D. none of the above
170. Zener diodes are used primarily as
A. amplifiers
B. voltage regulators
C. rectifiers
D. oscillators
171. 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
172. The capacitance of a varactor diode increases when reverse voltage across it
A. decreases
B. increases
C. breaks down
D. stores charge
173. To display the digit 8 in a seven-segment indicator
A. C must be lighted
B. G must be off
C. F must be on
D. All segments must be lighted
174. A photo-diode is normally
A. forward-biased
B. reverse-biased
C. Neither forward nor reverse biased
D. Emitting light
175. When the reverse voltage increases, the junction capacitance
A. decreases
B. stays the same
C. increases
D. has more bandwidth
Page 25 of 36