Semiconductor Electronics: Materials, Devices and

The circuit contains two diodes each with a forward resistance of 50 $\Omega$ and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 120 $\Omega$ resistance is---------mA.

LED is constructed from Ga – As – P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour.

[h = 6.63 * 10^-34 Js and c = 3 * 10⁸ ms^-1]

Given below are two statements:

Statement I :  PN junction diodes can be used to function as transistor simply by connecting two diodes, back to back, which acts as the base terminal.

Statement II : In the study of transistor, the amplification factor b indicates ratio of the collector current to the base current.

In the light of the above statements, choose the correct answer from the options given below.

Zener breakdown occurs in a P- n junction having P and n both:

A 5 V battery is connected across the points X and Y. Assume D₁ and D₂ to the normal silicon diodes. Find the current supplies by the battery if the +ve terminal of the battery is connected to point X.

For extrinsic semiconductors; when doping level is increased

The truth table for the following, logic circuit is

The output $\left(Y\right)$  of the given logic gate is similar to the output of an/a

In an ideal transformer, the turns ratio is $\frac{N_P}{N_S}=\frac{1}{2}$ . The ratio $V_S:V_P$  is equal to (the symbols carry their usual meaning) :