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

Related Mcqs:

1. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?

   A. 1 v
   B. 2v
   C. 1.4v
   D. 2.8v

2. 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

3. 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

4. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?

   A. 5 Ω & 20 %
   B. 25 Ω & 20 %
   C. 5 Ω & 16.7 %
   D. 25 Ω & 16.7 %

5. Which of the following is not associated with a p-n junction?

   A. junction capacitance
   B. charge storage capacitance
   C. depletion capacitance
   D. channel length modulation

6. 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

7. A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?

   A. 50 KHz
   B. 100KHz
   C. 1000/17 KHz
   D. 1000/7.07 KHz

8. In a transistor leakage current mainly depends on__________?

   A. doping of base
   B. size of emitter
   C. rating of transistor
   D. temperature

9. 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

10. MOSFET can be used as a__________?

    A. current controlled capacitor
    B. voltage controlled capacitor
    C. current controlled inductor
    D. voltage controlled inductors