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

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_____________?

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______?

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

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