Which of the following devices has the highest input impedance ?

Related Mcqs:

1. A JFET has high input impedance because _________________?

   A. it is made of semiconductor material
   B. input is reverse biased
   C. of impurity atoms
   D. none of the above

2. The input impedance of a MOSFET is of the order of______________?

   A. O
   B. a few hundred O
   C. kO
   D. several MO

3. The input control parameter of a JFET is __________________?

   A. gate voltage
   B. source voltage
   C. drain voltage
   D. gate current

4. In class A operation, the input circuit of a JFET is ____________ biased?

   A. forward
   B. reverse
   C. not
   D. none of the above

5. A JFET is a__________ driven device?

   A. current
   B. voltage
   C. both current and voltage
   D. none of the above

6. The pinch-off voltage of a JFET is about _______________?

   A. 5 V
   B. 0.6 V
   C. 15 V
   D. 25 V

7. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current _____________?

   A. is increased
   B. is decreased
   C. remains the same
   D. none of the above

8. A CS JFET amplifier has a load resistance of 10 kO , RD= 820O . If gm= 5mS and Vin= 500 mV, the output signal voltage is__________________?

   A. 2.05 V
   B. 25 V
   C. 0.5 V
   D. 1.89 V

9. The channel of a JFET is between the ________________?

   A. gate and drain
   B. drain and source
   C. gate and source
   D. input and output

10. In a JFET, IDSS is known as ________________?

    A. drain to source current
    B. drain to source current with gate shorted
    C. drain to source current with gate open
    D. none of the above