FET

41. The output characteristics of a JFET closely resemble the output characteristics of a _________ valve

1. pentode
2. tetrode
3. triode
4. diode

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42. The pinch-off voltage in a JFET is analogous to voltage in a vacuum tube

1. anode
2. cathode
3. grid cut off
4. none of the above

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43. The pinch-off voltage of a JFET is about _________

1. 5 V
2. 0.6 V
3. 15 V
4. 25 V

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44. The source terminal of a JEFT corresponds to _________ of a vacuum tube

1. plate
2. cathode
3. grid
4. none of the above

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45. The transconductance of a JFET ranges from _________

1. 100 to 500 mA/V
2. 500 to 1000 mA/V
3. 0.5 to 30 mA/V
4. above 1000 mA/V

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46. The two important advantages of a JFET are _________

1. high input impedance and square-law property
2. inexpensive and high output impedance
3. low input impedance and high output impedance
4. none of the above

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47. When drain voltage equals the pinch-off-voltage, then drain current with the increase in drain voltage

1. decreases
2. increases
3. remains constant
4. none of the above

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48. Which of the following devices has the highest input impedance?

1. JFET
2. MOSFET
3. Crystal diode
4. ordinary transistor

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