The action of JFET in its equivalent circuit can best be represented as a_____________?

Related Mcqs:

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

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

2. 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

3. The MOSFET switch in its on-state may be considered equivalent to_____________?

   A. resistor
   B. inductor
   C. capacitor
   D. battery

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. 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

6. 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 %

7. 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

8. 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

9. The bandwidth of an RF tuned amplifier is dependent on____________?

   A. Q –factor of the tuned o/p circuit
   B. Q –factor of the tuned i/p circuit
   C. Quiescent operating point
   D. Q-factor of the o/p and i/p circuits as well as quiescent operating point

10. The horizontal intercept of dc load line is the same as ideal____________?

    A. cut off point
    B. saturation point
    C. operating point
    D. quasi saturation point