When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
(A) Is increased
(B) Is reduced
(C) Remains the same
(D) None of the above
In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
(A) Remains the same
(B) Decreases
(C) Increases
(D) Insufficient data
A second condition for oscillations is____________?
(A) A gain of 1 around the feedback loop
(B) No gain around the feedback loop
(C) The attention of the feedback circuit must be one-third
(D) The feedback circuit must be capacitive
An oscillator differs from an amplifier because it_____________?
(A) Has more gain
(B) Requires no input signal
(C) Requires no
(D) c. supply
The piezoelectric effect in a crystal is___________?
(A) A voltage developed because of mechanical stress
(B) A change in resistance because of temperature
(C) A change in frequency because of temperature
(D) None of the above
A transistor has____________?
(A) one pn junction
(B) two pn junctions
(C) three pn junctions
(D) four pn junctions
If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
(A) 10
(B) 1
(C) 01
(D) 15
The element that has the biggest size in a transistor is____________?
(A) collector
(B) base
(C) emitter
(D) collector-base-junction
An oscillator produces___________oscillations?
(A) Damped
(B) Undamped
(C) Modulated
(D) None of the above