Q.1
Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in
Q.2
The MOSFET switch in its onstate may be considered equivalent to
Q.3
Most of the linear ICs are based on the two-transistor differential amplifier because of its
Q.4
The current gain of a bipolar transistor drops at high frequencies because of
Q.5
Generally, the gain of a transistor amplifier falls at high frequencies due to the
Q.6
If=0.98, Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be
Q.7
Which of the following is not associated with a p-n junction
Q.8
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is
Q.9
In a common emitter, unbypassed resister provides
Q.10
Which of the following statements is false?
Q.11
Class AB operation is often used in power large signal) amplifiers in order to
Q.12
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
Q.13
Voltage Series (feedback also called series-shunt feedback) results in
Q.14
The cascade amplifier is a multistage configuration of
Q.15
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
Q.16
Negative feedback in an amplifier
Q.17
The current gain of a BJT is
Q.18
MOSFET can be used as a
Q.19
Which of the following statements is false?
  • Push pull signals are equal and opposite in phase
  • Class AB operation cannot be used for a push pull audio power output phase
  • A push pull output transformer has a centre-tapped primary
  • All of the above
Q.20
Negative feedback in an amplifier
  • Reduces gain
  • Increase frequency &phase distortion
  • Reduces bandwidth
  • Increases noise
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