1. .1 The JFET is
(A) A unipolar device
(B) A voltage-controlled device
(C) A current-controlled device
(D) Answers (a) and (b)
2. .2 The channel of a JFET is between the
(A) Gate and drain
(B) Gate and source
(C) Drain and source
(D) Input and output
3. .3 A JFET always operates with
(A) The gate connected to the source
(B) The gate-to-source PN junction forward-biased
(C) The drain connected to ground
(D) The gate-to-source PN junction reverse-biased
4. .4 For VGS = 0 V, the drain current becomes constant when VDS exceeds
(A) Cutoff
(B) VP
(C) VDD
(D) 0 V
5. .5 The constant-current region of a FET lies between
(A) Cutoff and saturation
(B) Cutoff and pinch-off
(C) Pinch-off and breakdown
(D) 0 and IDSS
6. .6 IDSS is
(A) The drain current with the source shorted
(B) The drain current at cutoff
(C) The maximum possible drain current
(D) The midpoint drain current
7. .7 At cutoff, the JFET channel is
(A) At its widest point
(B) Extremely narrow
(C) Completely closed by the depletion region
(D) Reverse-biased
8. .8 A certain JFET datasheet gives VGS(off) = -4V. The pinch-off voltage, VP,
(A) Is -4V
(B) Is +4V
(C) Depends on VGS
(D) Cannot be determined
9. .10 A D-MOSFET operates in
(A) The depletion mode only
(B) The enhancement mode only
(C) Both the depletion and enhancement modes
(D) The ohmic region only
10. .11 An N-channel D-MOSFET with a positive VGS is operating in
(A) The enhancement mode
(B) The depletion mode
(C) Cutoff
(D) Saturation
11. .12 In an E-MOSFET, there is no drain current until VGS
(A) Reaches VGS(th)
(B) Is positive
(C) Is negative
(D) Equals 0V
12. .13 A JFET has three terminals, namely
(A) Cathode, anode, grid
(B) Emitter, base, collector
(C) None of the above
(D) Source, gate, drain
13. .14 A JFET is a ....... driven device.
(A) Current
(B) Both current and voltage
(C) Voltage
(D) None of the above
14. .15 The gate of a JFET is biased
(A) Forward
(B) Reverse
(C) Reverse as well as forward
(D) None of the above
15. .16 In a P-channel JFET, the charge carriers are
(A) Electrons
(B) Both electrons and holes
(C) Holes
(D) None of the above
16. .17 When drain voltage equals the pinch-off voltage, with the increase in drain voltage, the drain current will
(A) Remain constant
(B) Increase
(C) Decrease
(D) None of the above
17. .18 The input control parameter of a JFET is
(A) Gate voltage
(B) Source voltage
(C) Drain voltage
(D) Gate current
18. .19 In a JFET, IDSS is known as
(A) Drain to source current
(B) Drain to source current with gate open
(C) Drain to source current with gate shorted
(D) None of the above
19. .20 A MOSFET has terminals
(A) Two
(B) Five
(C) Four
(D) Three
20. .21 At cutoff, the JFET channel is
(A) At its widest point
(B) Completely closed by the depletion region
(C) Extremely narrow
(D) Reverse-biased
21. .22 An N-channel D-MOSFET with a positive VGS is operating in
(A) The depletion mode
(B) The enhancement mode
(C) Cutoff
(D) Saturation
22. .23 In a common-source amplifier, the output voltage is
(A) In phase with the input
(B) 180° out of phase with the input
(C) Taken at the source
(D) Taken at the drain
23. .24 A certain common-source amplifier has a voltage gain of 10. If the source bypass capacitor is removed
(A) The voltage gain will increase
(B) The transconductance will increase
(C) The voltage gain will decrease
(D) The Q-point will shift
24. .25 The common-gate (CG) amplifier differs from both the CS and CD configurations in that it has a
(A) Much higher voltage gain
(B) Much lower voltage gain
(C) Much lower input resistance
(D) Much higher input resistance
25. .26 If you are looking for both good voltage gain and high input resistance, you must use a
(A) None of the above
(B) CD amplifier
(C) CG amplifier
(D) CS amplifier
26. .27 If there is an internal open between the drain and source in a CS amplifier, the drain voltage is equal to
(A) VDD
(B) 0 V
(C) A value less than normal
(D) VGS