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 - 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 2. The transconductance curve of JFET which is also called as square law curve is : (a) Straight line (b) Parabolic (c) Circular (d) Wavy 3. Which of the following is/are valid statement(s) ? 1. The gate of a JFET is forward biased hence acts as a voltage controlled device. 2. The gate of a JFET is reversed biased, hence acts as a voltage controlled device. 3. The gate of a JFET is reverse biased, hence acts as voltage controlled device. (a) 1 (b) 2 (c) 1 and 2 (d) 1, 2 and 3 4. Field effect transistor has : (a) large input impedance (b) large output impedance (c) large power gain (d) large voltage gain 5. In the voltage range, Vp < VDS< BVDSS of an ideal JFET or MOSFET : (a) the drain current varies linearly with VDS (b) the drain current is constant (c) the drain current varies non-linearly with VDS (d) the drain current is cut off 6. The transconductance, gm of a JFET is computed at constant VDS, by the following : (a)…
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 - 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…