FET – 1 – 5

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

25. An FET acts as :

(a) A variable resistor
(b) A variable capacitor
(c) A variable voltage source
(d) A variable current source

ANSWER

EXPLANATION

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