Semiconductor Physics » Exercise – 2
51. Generally the value of ac resistance is ________ the value of dc resistance at the same operating point.
(a) smaller than
(b) larger than
(c) the same as
(d) unrelated to
52. Calculate static resistance RD of a diode having ID = 30 mA and VD = 0.75 V.
(a) 25
(b) 40
(c) 0.04
(d) 0.025
53. Calculate ID if RD = 30 and VD = 0.84 V.
(a) 28 mA
(b) 0.028 mA
(c) 2.8 A
(d) 280 A
54. Which of the following elements is most frequently used for doping pure Ge or Si?
(a) Boron
(b) Gallium
(c) Indium
(d) All of the above
55. The diffused impurities with ________ valence electrons are called donor atoms.
(a) 4
(b) 3
(c) 5
(d) 0
Related Posts
555555555593. As the forward current through a silicon diode increases, the internal resistance (a) increases. (b) decreases. (c) (d)- Transistors » Exercise - 1 1. A transistor acts as a : (a) Diode and voltage source (b) Diode and current source (c) Diode and power supply (d) Diode and resistance
- 555555555579. The heavier the current in a Zener diode in reverse bias, ________ dynamic resistance value. (a) the more the (b) the less the (c) there is substantially more (d) there is no change in the
- Special Diodes » Exercise - 276. In the breakdown region, a zener diode behaves like a ......... source. (a) constant voltage (b) constant current (c) constant resistance (d) none of the above
- Special Diodes » Exercise - 149. The dynamic resistance of a Zener diode : (a) Increases with increase in current (b) Decreases with increase in current (c) Decreases with decrease in current (d) Is independent of variation in current