Related Mcqs:

1. 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

2. 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 %

3. 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

4. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?

   A. Vdc = Vm/π, PIV=2Vm
   B. Vdc = 2Vm/π, PIV=2vm
   C. Vdc = 2Vm/π, PIV=Vm
   D. Vdc = Vm/π, PIV=Vm

5. 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

6. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?

   A. 23dB
   B. 25dB
   C. 46dB
   D. 50dB

7. An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

   A. 1/11KΩ
   B. 1/5KΩ
   C. 5KΩ
   D. 11KΩ

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___________?

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

9. 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

10. Voltage Series feedback also called series-shunt feedback) results in__________?

    A. Increase in both input & output impedances
    B. Decreases in both input & output impedances
    C. Increase in input impedance & decreases in output impedance
    D. Decrease in input impedance & increase in output impedance