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+∆IDS
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
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
9. The output characteristics of a JFET is similar to :
(a) Triode
(b) Pentode
(c) Thyratron
(d) Tetrode
10. For small values of drain to source voltage, JFET behaves like a :
(a) Diode
(b) Capacitor
(c) Inverter
(d) Resistor
Related Posts
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…
- FET » Exercise - 263. The gate voltage in a JFET at which drain current becomes zero is called .............. voltage. (a) saturation (b) pinch-off (c) active (d) cut-off
- FET » Exercise - 134. The JFET acts as a …….. along the horizontal part of the drain curve. (a) Resistor (b) Current source (c) Voltage source (d) Current sink
- FET » Exercise - 1 1. The JFET acts as a ........... along vertical parts of the drain curve. (a) Resistor (b) Current source (c) Voltage source (d) Current sink