A voltage \(V_{AB}\)is applied to the left side input and the potential differences \(V_{AX}\)and \(V_{XY}\)are measured. Assume the diodes are ideal i.e., there is no potential difference across the diodes in forward bias. Which of the following is true?

1. \(\text{If}~V_{AB}>0, V_{AX}>0\)
2. \(\text{If}~V_{AB}>0, V_{XY}>0\)
3. \(\text{If}~V_{AB}<0, V_{XY}>0\)
4. \(\text{If}~V_{AB}<0, V_{AX}>0\)

Subtopic: PN junction |

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Q10:

The truth table for a circuit is given by:

\(A\)	\(B\)	\(C\)	\(Y\) (Output)
\(1\)	\(X\)	\(1\)	\(1\)
\(0\)	\(1\)	\(X\)	\(1\)
All other cases			\(0\)

Here, \(X\) represents either \(0\) or \(1\). \(A,B,\) and \(C\) are the inputs. Which of the following is the correct circuit?

1.
2.
3.
4.

Subtopic: Logic gates |

52%

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Q11:

A simple \(\mathrm{p\text-n}\) junction diode follows the law:    \(i\text{(current)}=i_0e^{qV/kT},\) for large currents in forward bias.
Here, \(T=\) absolute temperature, \(V=\) voltage across the diode, \(k=\) Boltzmann's constant and \(i_0=\) the drift current.
Then, the differential resistance of the diode \(\left(\dfrac{dV}{di}\right)\) is given by:
1.  \(\text{(constant)}i\)
2.  \(\text{(constant)}i^2\)
3.  \(\dfrac{\text{constant}}{i}\)
4.  \(\text{(constant)}e^{-\beta i},~\beta\text{-constant}\)

Subtopic: PN junction |

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Q12:

Which of the following represents a circuit that gives an output (i.e. true) when both its inputs are equal?

1.
2.
3.
4.

Subtopic: Logic gates |

57%

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Q13:

The current-voltage characteristic of an ideal \(\mathrm{p \text{-}n}\) junction diode is given by the graph as shown in the following figure:

This diode is connected with a resistance of \(5~\Omega\) in series with it as shown below:

Which of the following shows the dependence of the voltage \(V_{AB}\) and the current \(i,\) when the diode is forward-biased?
(\(V_{AB}\) in volt, \(i\) in ampere)

1.	\(V_{A B}=i\cdot5+0.6\)
2.	\(V_{A B}=i\cdot5-0.6\)
3.	\(V_{A B}=i\cdot5+(0.6-5)\)
4.	\(V_{A B}=i\cdot5+\left(0.6+5\right)\)

Subtopic: PN junction |

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Q14:

The voltage \(V_{AB}=20~\text{V}\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)