FET – Exercise – 3

126. What is the level of IG in an FET?

(a) Zero amperes
(b) Equal to ID
(c) Depends on VDS
(d) Undefined

Answer
Answer : (a)
Explanation
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127. What is the range of an FET’s input impedance?

(a) 10 to 1 k
(b) 1 k to 10 k
(c) 50 k to 100 k
(d) 1 M to several hundred M

Answer
Answer : (d)
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128. Refer to the following characteristic curve. Calculate the resistance of the FET at VGS = –0.25 V if ro = 10 k.

(a) 1.1378 k
(b) 113.78
(c) 11.378
(d) 11.378 k

Answer
Answer : (d)
Explanation
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129. What is the level of drain current ID for gate-to-source voltages VGS less than (more negative than) the pinch-off level?

(a) zero amperes
(b) IDSS
(c) Negative value
(d) Undefined

Answer
Answer : (a)
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130. At which of the following is the level of VDS equal to the pinch-off voltage?

(a) When ID becomes equal to IDSS
(b) When VGS is zero volts
(c) IG is zero
(d) All of the above

Answer
Answer : (d)
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