Negative feedback in an amplifier____________?

A. Reduces gain
B. Increase frequency &phase distortion
C. Reduces bandwidth
D. Increases nosie

Class AB operation is often used in power large signal amplifiers in order to_________?

A. Get maximum efficiency
B. Remove even harmonics
C. Overcome a crossover distortion
D. Reducing collector dissipation

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___________?

A. 0.25
B. 0.5
C. 0.75
D. 1

The effective channel length of a MOSFET in a saturation decreases with increase in___________?

A. Gate voltage
B. Drain voltage
C. Source voltage
D. Body voltage

A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?

A. Cmmr
B. Bandwidth
C. Slew rate
D. Open-loop gain

An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.

A. 10 volts
B. 5 volts
C. 5/1 volts
D. 5/2 volts

A source follower using an FET usually has a voltage gain which is___________?

A. Greater than +100
B. Slightly less than unity but positive
C. Exactly unity but negative
D. About -10

The early effect in a bipolar junction transistor is caused by_______________?

A. Fast turn-on
B. Fast turn-off
C. Large collector-base reverse bias
D. Large emitter-base forward bias

In an op-amp differentiator:________________?

A. The amplitude of output is proportional to rate of change of input
B. The amplitude of output is proportional to input
C. Output occurs when input is finite and constant
D. Polarity of input and output is the same

In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?

A. All resistors
B. All transistors
C. All inductors
D. All capacitors