FET

21. For VGS = 0 V, the drain current becomes constant when VDS exceeds _________

1. cut off
2. VDD
3. VP
4. o V

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22. If load resistance in the above question (Q.49) is removed, the output voltage will _________

1. increase
2. decrease
3. stay the same
4. be zero

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23. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current _________

1. is increased
2. is decreased
3. remains the same
4. none of the above

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24. If the gate of a JFET is made less negative, the width of the conducting channel _________

1. remains the same
2. is decreased
3. is increased
4. none of the above

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25. If the reverse bias on the gate of a JFET is increased, then width of the conducting channel _________

1. is decreased
2. is increased
3. remains the same
4. none of the above

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26. In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is _________

1. 46
2. 1
3. 11.4
4. 8.75

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27. In a certain CS JFET amplifier, RD= 1kO , RS= 560 O , VDD=10V and gm= 4500 µS. If the source resistor is completely bypassed, the voltage gain is _________

1. 450
2. 45
3. 2.52
4. 4.5

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28. In a common-source JFET amplifier, the output voltage is _________

1. 180o out of phase with the input
2. in phase with the input
3. 90o out of phase with the input
4. taken at the source

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29. In a FET, there are pn junctions at the sides

1. three
2. four
3. five
4. two

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30. In a JFET, IDSS is known as _________

1. drain to source current
2. drain to source current with gate shorted
3. drain to source current with gate open
4. none of the above

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