92. 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

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93. 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

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94. 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

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95.  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

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96. ____has the lowest noise-level.
A. triode
B. ordinary transistor
C. tetrode
D. JFET

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97. A MOSFET is sometimes called ____ JFET.
A. many gate
B. open gate
C. insulated gate
D. shorted gate

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98. Which of the following devices has the highest input impedance?
A. JFET
B. MOSFET
C. crystal diode
D. ordinary transistor

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