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# FET – 2 – 6

76. In a certain CS JFET amplifier, RD = 1 k Ω, RS = 560 Ω, VDD = 10 V and gm = 4500 microS. If the source resistor is completely bypassed, the voltage gain is ……………

(a) 450
(b) 45
(c) 2.52
(d) 4.5

Explanation
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77. A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ………………….

(a) the voltage gain will increase
(b) the transconductance will increase
(c) the voltage gain will decrease
(d) the Q-point will shift

Explanation
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78. A CS JFET amplifier has a load resistance of 10 k Ω and RD = 820 Ω. If gm = 5 mS and Vin = 500 mV, the output signal voltage is …

(a) 2.05 V
(b) 25 V
(c) 0.5 V
(d) 1.89 V

Explanation
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79. If load resistance in Q. 78 is removed, the output voltage will ……………

(a) increase
(b) decrease
(c) stay the same
(d) be zero

Explanation
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80. A JFET can operate in :

(a) Depletion mode only
(b) Enhancement mode only
(c) Depletion and enhancement modes
(d) Neither enhancement nor depletion mode