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FET – 1 – 2

6. The transconductance, gm of a JFET is computed at constant VDS, by the following :

(a) ∆ID/∆VGS
(b) ∆VGS/∆ID
(c) ∆VGSx∆ID
(d) ∆ID/∆VGS+∆I
DS

ANSWER

EXPLANATION

7. The pinch-off voltage of JFET has a same magnitude as that of :

(a) Gate voltage
(b) Gate source voltage
(c) Drain–source voltage
(d)
 None of these

ANSWER

EXPLANATION

8. The gate cut-off and pinch-off voltages of JFET have :

(a) Same magnitude and sign
(b) Different magnitudes but same sign
(c) Same magnitude but different signs
(d) 
Different magnitudes and signs

ANSWER

EXPLANATION

9. The output characteristics of a JFET is similar to :

(a) Triode
(b) Pentode
(c) Thyratron
(d) Tetrode

ANSWER

EXPLANATION

10. For small values of drain to source voltage, JFET behaves like a :

(a) Diode
(b) Capacitor
(c) Inverter
(d) Resistor

ANSWER

EXPLANATION

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