21. Which is valid with respect to JFET ?
(a) Operated in depletion and enhancement modes
(b) Gate is not insulated from channel
(c) Channel doesn’t permanently exist
(d) It possesses low input impedance
22. An n-channel JFET having a pinch off voltage of –5 V shows a transconductance of 1 mA/V when applied gate-to-source voltage of –3 V. Then its maximum transconductance is found to be :
(a) 1.5 mA/V
(b) 2.0 mA/V
(c) 2.5 mA/V
(d) 3.0 mA/V
23. JFET channel is pinched-off only when :
(a) VDD is equal to VP
(b) VDSis greater than VP
(c) VDSis less than VP
(d) VDSis equal to VP
24. Determine the invalid statement.
(a) For an n-channel JFET, both VGS and VP are negative
(b) For a p-channel JFET, both VGS and VP are positive
(c) For an n-channel JFET, IDSS is positive
(d) For a p-channel JFET, IDSS is positive
25. An FET acts as :
(a) A variable resistor
(b) A variable capacitor
(c) A variable voltage source
(d) A variable current source
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FET » Exercise - 150. The input control parameter of a JFET is ....... (a) gate voltage (b) source voltage (c) drain voltage (d) gate current- FET » Exercise - 2 51. A common base configuration of a pnp transistor is analogous to ....... of a JFET. (a) common source configuration (b) common drain configuration (c) common gate configuration (d) none of the above 52. A JFET has high input impedance because ....... (a) it is made of semiconductor material (b) input is reverse biased (c) of impurity atoms (d) none of the above 53. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ....... (a) almost touch each other (b) have large gap (c) have moderate gap (d) none of the above 54. In a JFET, IDSS is known as .............. (a) drain to source current (b) drain to source current with gate shorted (c) drain to source current with gate open (d) none of the above 55. The two important advantages of a JFET are .............. (a) high input impedance and square-law property (b) inexpensive and high output impedance (c) low input impedance and high output impedance (d) none of the above 56. .............. has the lowest noise-level. (a) triode (b) ordinary transistor (c) tetrode (d) JFET 57. A MOSFET is sometimes called ....... JFET. (a) many gate (b) open gate (c) insulated gate (d) shorted gate…
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