66. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?
(a) 0
(b) 1
(c) 2
(d) 3
67. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
(a) N2/N1
(b) (N1/N2)2
(c) (N1/N2)1/3
(d) N1 × N2
68. What transformer turns ratio is required to match an 8 Ω speaker load so that the effective load resistance seen at the primary is 12.8 kΩ?
(a) 20:1
(b) 40:1
(c) 50:1
(d) 60:1
69. Nota
70. ________ amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts.
(a) Small-signal
(b) Power
(c) Medium-signal
(d) None of these
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