Top 250+ Solved Electronic Devices and Circuits MCQ Questions Answer
Q. In class A operation, the operating point is generally located of the d.c. load line.
a. at cut off point
b. at the middle
c. at saturation point
d. none of the above
Q. The output transformer used in a power amplifier is a transformer.
a. 1:1 ratio
b. step-up
c. step-down
d. none of the above
Q. Power amplifiers primarily provide sufficient power to an output load, typically from to .
a. a few kw, tens of kw
b. 500 w, 1 kw
c. 100 w, 500 w
d. a few w, tens of w
Q. The main feature(s) of a large-signal amplifier is (are) the .
a. circuit\s power efficiency
b. maximum amount of power that the circuit is capable of handling
c. impedance matching to the output
d. all of the above
Q. In power amplifiers, the output signal varies for a full 360º of the cycle.
a. class a
b. class b or ab
c. class c
d. class d
Q. In class B power amplifiers, the output signal varies for of the cycle.
a. 360º
b. 180º
c. between 180º and 360º
d. less than 180º
Q. amplifiers have the highest overall efficiency.
a. class a
b. class b or ab
c. class c
d. class d
Q. In a class A transformer-coupled amplifier, the the value of VCEmax and the the value of VCEmin, the the efficiency to (from) the theoretical limit of 50%.
a. larger, smaller, farther
b. larger, smaller, closer
c. smaller, larger, closer
d. none of the above
Q. In class B operation, the current drawn from a single power supply has the form of rectified signal.
a. a full-wave
b. a half-wave
c. both a full-wave and a half-wave
d. none of the above
Q. The highest efficiency is obtained in class B operation when the level of VL(p) is equal to .
a. 0.25vcc
b. 0.50vcc
c. vcc
d. 2vcc
Q. transistors can be used to build a class B amplifier.
a. npn and pnp
b. nmos and pmos
c. both npn and pnp or nmos and pmos
d. none of the above
Q. The complementary Darlington-connected transistor for a class B amplifier provides output current and output resistance.
a. higher, higher
b. higher, lower
c. lower, lower
d. lower, higher
Q. The fundamental component is typically any harmonic component.
a. larger than
b. the same as
c. smaller than
d. none of the above