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Electronics Engineering Objective Questions { FET and FET Amplifiers }

141. The parameter of FET are gm = 95 mA/ volt, total capacitance = 500 pF. For a voltage gain of ?30, the bandwidth will be
A. 333 f2
B. 3 k
C. 2.7 k
D. 300 ohm
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142. A two stage amplifier with negative feedback has an overshoot when a damping factor k is
A. less than unity
B. greater than unity
C. zero
D. negative
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143. FET tuned amplifier with gm = 5 mA/V. rd = 20 k has a resonant impedance of 20 k.Q. The gain resonance is given by
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144. Pinch off voltage VP for an FET is the drain voltage at which
A. significant drain current starts flowing
B. drain current becomes zero
C. all free charges get removed from the channel
D. avalanche break down takes place
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145. The ON-resistance rdoN of an FET is the ratio
A. VDs/1D at the origin
B. VDs/lD in the saturation region
C. AVDs/A1D in the saturation region
D. VGS/ID at the origin
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146.  FET has offset voltage of about
A. 0.2 volt
B. 0.6 volt
C. 1.1 volt
D. zero
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147. In a JFET, beyond the pinch off voltage, as the drain voltage increases; the drain current
A. remains almost constant
B. decreases
C. increases
D. may increases or decrease
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