(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
Answer
Answer : (b)
Explanation
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Special Diodes » Exercise - 132. The dynamic impedance of Zener diode ………. with increase in the current flow through it. (a) Increases (b) Decreases (c) Remains unaffected (d) Is independent
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 56. In what state is a silicon diode if the voltage drop across it is about 0.7 V? (a) No bias (b) Forward bias (c) Reverse bias (d) Zener region 57. What unit is used to represent the level of a diode forward current IF? (a) pA (b) nA (c) A (d) mA 58. The condition of a semiconductor diode can be determined quickly using a…
Special Diodes » Exercise - 262. If the temperature of a crystal diode increases, then leakage current ........ (a) remains the same (b) decreases (c) increases (d) becomes zero
Special Diodes » Exercise - 132. The dynamic impedance of Zener diode ………. with increase in the current flow through it. (a) Increases (b) Decreases (c) Remains unaffected (d) Is independent