In a forward biased PN-junction diode, the potential barrier in the depletion region is of the form

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Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current

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If the following input signal is sent through a PN-junction diode, then the output signal across RL will be

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The curve between charge density and distance near P-N junction will be

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The resistance of a germanium junction diode whose is shown in figure is Vk=0.3V


(a) 5 kΩ
(b) 0.2 kΩ
(c) 2.3 kΩ
(d) 102.3

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In the half-wave rectifier circuit shown. Which one of the following wave forms is true for VCD, the output across C and D?

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A full-wave rectifier circuit along with the input and output voltages is shown in the figure.

The contribution to the output voltage from diode – 2 is :

(a) A, C                       (b) B, D
(c) B, C                       (d) A, D

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The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2 volt is applied

(a) 1 Ω
(b) 0.25 Ω 
(c) 0.5 Ω
(d) 5 Ω

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The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is 

(a) An AND gate                   (b) An OR gate
(c) A NAND gate                   (d) An NOT gate

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The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is 

           

(a) 2.5 m mho      (b) 5.0 m mho
(c) 7.5 m mho      (d) 10.0 m mho

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