In an op-amp differentiator:________________?

Related Mcqs:

1. Thermal runaway is not possible in FET because as the temperature of FET increases_________________?

   A. the mobility decreases
   B. the transconductance increases
   C. the drain current increases
   D. none of the above

2. A change in the value of the emitter resistance Re in a differential amplifier?

   A. affects the difference mode gain Ad
   B. affects the common mode gain Ac
   C.affects both Ad and Ac
   D. does not effect either Ad and Ac

3. To prevent a DC return between source and load, it is necessary to use___________?

   A. resistor between source and load
   B. inductor between source and load
   C. capacitor between source and load
   D. either A. or B.

4. 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

5. 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

6. 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

7. 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

8. Which of the following amplifier circuit using junction transistor has the best gain?

   A. Common base
   B. Common emitter
   C. Common collector
   D. All have the same gain

9. 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

10. 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