## In all base driver amplifiers__________?

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__________?

The encapsulation of transistor is necessary for__________?

B. preventing photo-emission effects
C. avoiding loss of free electrons
D. mechanical ruggedness

## The cascade amplifier is a multistage configuration of__________?

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_________?

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________?

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

## An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

A. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

## The MOSFET switch in its on-state may be considered equivalent to_____________?

The MOSFET switch in its on-state may be considered equivalent to_____________?

A. resistor
B. inductor
C. capacitor
D. battery

## . If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?

. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?

A. 2.3mA
B. 3.2mA
C. 4.6 mA
D. 5.2mA

## In a common emitter, unbypassed resister provides___________?

In a common emitter, unbypassed resister provides___________?

A. voltage shunt feedback
B. current series feedback
C. negative voltage feedback
D. positive current feedback

## A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

A. 2
B. 1
C. 1/2
D. 0