56. ………….. has the lowest noise-level.
(a) triode
(b) ordinary transistor
(c) tetrode
(d) JFET
57. A MOSFET is sometimes called ……. JFET.
(a) many gate
(b) open gate
(c) insulated gate
(d) shorted gate
58. The pinch-off voltage in a JFET is analogous to ……. voltage in a vacuum tube.
(a) anode
(b) cathode
(c) grid cut off
(d) none of the above
59. The formula for a.c. drain resistance of a JFET is …………..
(a) ∆VDS/∆ID at constant VGS
(b) ∆VGS/∆ID at constant VDS
(c) ∆ID/∆VDS at constant VDS
(d) ∆ID/∆VDS at constant VGS
60. In class A operation, the input circuit of a JFET is …………. biased.
(a) forward
(b) reverse
(c) not
(d) none of the above
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