Semiconductor Electronics: Materials, Devices and Simple Circuits

The output (X) of the logic circuit shown in figure will be

• $\mathrm{X} = \stackrel{=}{\mathrm{A}} . \stackrel{=}{\mathrm{B}}$

• $\mathrm{X} = \overline{\mathrm{A} . \mathrm{B}}$

• X = A .B

• $\mathrm{X} = \overline{\mathrm{A} + \mathrm{B}}$

The output Y ofthe logic circuit given below is

• $\overline{\mathrm{A}} + \mathrm{B}$

• $\overline{\mathrm{A}}$

• $\overline{\left(\overline{\mathrm{A}} + \mathrm{B}\right)} . \overline{\mathrm{A}}$

• $\overline{\left(\overline{\mathrm{A}} + \mathrm{B}\right)} . \mathrm{A}$

In the bandgap between valence band and conduction band in a material is 5.0 eV, then the material is

• semiconductor

• good conductor

• superconductor

• insulator

In a transistor output characteristics commonly used in common emitter configuration, the base current I_B, the collector current l_C and the collector emitter voltage V_CE have values of the following orders of magnitude in the active region

• I_B and I_C both are in µA and V_CE in volt

• I_B is in µA and I_C is in mA and V_CE in volt

• I_B is in mA and I_C is in µA and V_CE in volt

• I_B is in mA and I_C is in mA and V_CE in mV

The inputs to the digital circuit are as shown below. The output Y is

• $\mathrm{A}\hspace{0.17em}+ \mathrm{B} + \overline{\mathrm{C}}$

• $\left(\mathrm{A}\hspace{0.17em}+ \mathrm{B}\right) \overline{\mathrm{C}}$

• $\overline{\mathrm{A}} + \overline{\mathrm{B}} + \overline{\mathrm{C}}$

• $\overline{\mathrm{A}} + \overline{\mathrm{B}} + \mathrm{C}$