Top 250+ Solved Electronic Devices and Circuits MCQ Questions Answer
Q. CC configuration is used for impedance matching because its
a. input impedance is very high
b. input impedance is very low
c. output impedance is very low
d. output impedance is zero
Q. Which of the following is the other name of the output stage in an amplifier?
a. load stage
b. audio stage
c. power stage
d. rf stage
Q. When amplifiers are cascaded
a. the gain of each amplifier is increased
b. a lower supply voltage is required
c. the overall gain is increased
d. each amplifier has to work less
Q. Ina common emitter amplifier, the capacitor from emitter to ground is called the
a. coupling capacitor
b. bypass capacitor
c. decoupling capacitor
d. tuning capacitor
Q. What is the maximum collector efficiency of a resistance loaded class A power amplifier?
a. 50%
b. 78.50%
c. 25%
d. 30%
Q. What is the maximum collector efficiency of a transformer coupled class A power amplifier?
a. 30%
b. 80%
c. 45%
d. 50%
Q. Class C amplifiers are used as
a. af amplifiers
b. small signal amplifiers
c. rf amplifiers
d. if amplifiers
Q. If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
a. increases
b. decreases
c. becomes erratic
d. remains the same
Q. A complementary-symmetry amplifier has
a. one pnp and one npn transistor
b. two pnp transistors
c. two npn transistors
d. two pnp and two npn transistors
Q. Power amplifiers generally use transformer coupling because transformer coupling provides
a. cooling of the circuit
b. distortionless output
c. impedance matching
d. good frequency response
Q. The output transformer used in a power amplifier is a/an transformer
a. 1:1 ratio
b. step-down
c. step-up
d. isolation
Q. An emitter follower has a voltage gain that is
a. much less than one
b. approximately equal to one
c. greater than one
d. zero