26. Consider the statements given below :
Statement I : In FET the generator current is proportional to the input voltage.
Statement II : In BJT, the generator current is proportional to the input current.
Which of the following is valid ?
(a) Statement I
(b) Statement II
(c) Both statements I & II
(d) Either statement I or II
27. FETs are used in an amplifier to obtain :
(a) Low input impedance
(b) Low output impedance
(c) High input impedance
(d) High output impedance
28. Which of the following exhibits very high input impedance ?
(a) Diode
(b) P-N-P
(c) N-P-N
(d) FET
29. …….. indicates how effectively the input voltage controls the output current in a JFET.
(a) Slow rate
(b) Transconductance
(c) Transresistance
(d) Intrinsic stand-off ratio
30. ……… is preferred form of bias for a JFET amplifier.
(a) Self bias
(b) Voltage divider bias
(c) Two supply bias
(d) Emitter feedback bias
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FET » Exercise - 2 51. A common base configuration of a pnp transistor is analogous to ....... of a JFET. (a) common source configuration (b) common drain configuration (c) common gate configuration (d) none of the above 52. 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 53. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ....... (a) almost touch each other (b) have large gap (c) have moderate gap (d) none of the above 54. 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 55. The two important advantages of a JFET are .............. (a) high input impedance and square-law property (b) inexpensive and high output impedance (c) low input impedance and high output impedance (d) none of the above 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…