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ECE Objective Questions { FET and FET Amplifiers }

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

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

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

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

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

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

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

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