The most commonly used amplifier in sample & hold circuits is______________?
(A) A unity gain non-inverting amplifier
(B) A unity gain inverting amplifier
(C) An inverting amplifier with a gain of 10
(D) An inverting amplifiers with a gain of 100
In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
(A) Vdc = Vm/π, PIV=2Vm
(B) Vdc = 2Vm/π, PIV=2vm
(C) Vdc = 2Vm/π, PIV=Vm
(D) Vdc = Vm/π, PIV=Vm
The action of JFET in its equivalent circuit can best be represented as a_____________?
(A) Current controlled Current source
(B) Current controlled voltage source
(C) Voltage controlled voltage source
(D) voltage controlled current source
Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude?
(A) Equal to
(B) Greater than
(C) Less than
(D) None of the above
Over modulation results in ______________?
(A) Weakening of the signal
(B) Excessive carrier power
(C) Distortion
(D) None of the above
In all base driver amplifiers__________?
(A) ac collector voltage is 180° out of phase with ac base voltage
(B) ac emitter voltage is 180° out of phase with ac base voltage
(C) ac collector voltage is in phase with ac base voltage
(D) none of the above
The encapsulation of transistor is necessary for__________?
(A) preventing radio interference
(B) preventing photo-emission effects
(C) avoiding loss of free electrons
(D) mechanical ruggedness
The cascade amplifier is a multistage configuration of__________?
(A) CC-CB .
(B) CE-CB
(C) CB-CC
(D) CE-CC
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
(A) 49dB
(B) 51dB
(C) 98dB
(D) 102dB
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
(A) 795mV
(B) 395mV
(C) 795 mV
(D) 39.5mV