Semiconductor Electronics

In an energy band diagram, the y-axis usually represents:

Which of these materials behaves as a perfect insulator at $0\text{ K}$?

At absolute zero, the conduction band of a pure semiconductor is:

The empty space between the valence band and the conduction band where no electron can exist is called the:

According to the energy band theory, the most fundamental difference between a semiconductor and an insulator is:

If a pure Silicon crystal has $5 \times 10^{28}$ atoms/$m^3$ and it is doped with $1\,ppm$ of Arsenic, the number of donor atoms per $m^3$ is:

Which of the following is true about holes in the valence band?

In a crystal lattice, the potential seen by an electron is:

The energy bandgap of Gallium Arsenide ($GaAs$) at room temperature is approximately:

A semiconductor has $N_c = 10^{19}\text{ cm}^{-3}$ and $N_v = 5 \times 10^{18}\text{ cm}^{-3}$. At $300\text{ K}$, if the material is intrinsic, the Fermi level is:

Which of the following has a higher mobility at room temperature in a Silicon crystal?

If $N_A$ is the concentration of acceptor atoms added to an intrinsic semiconductor, then in the resulting p-type material (at room temperature):

Which of the following statements about holes is true?

When a small amount of Gallium is added to Germanium, the resulting crystal is:

In a p-type semiconductor, the majority carriers are holes and the minority carriers are electrons. If the temperature is increased:

Why is Silicon preferred over Germanium for making semiconductor devices like diodes and transistors?

The movement of holes in a semiconductor is due to:

Comparing Si and Ge at room temperature, which has a higher intrinsic conductivity and why?

If the temperature coefficient of resistance for a material is negative, and it has a bandgap of $0.1 \text{ eV}$, it is most likely a:

Which statement correctly describes the difference between an intrinsic semiconductor at $T > 0 \text{ K}$ and an n-type semiconductor at $T > 0 \text{ K}$?

Which component in a full-wave center-tap rectifier ensures current flows through the load in the same direction during both halves of the AC cycle?

A pentavalent impurity atom has how many valence electrons?

A trivalent impurity atom has how many valence electrons?

When a p-n junction diode is unbiased, the net current through the junction is:

In the circuit shown below, $D_1$ and $D_2$ are Silicon diodes, each having a knee voltage (cut-in voltage) of $0.7 \, \text{V}$. The potential at terminal A is maintained at $5.7 \, \text{V}$ while terminal B is grounded ($0 \, \text{V}$). If the resistance of each resistor is $200 \, \Omega$, calculate the total current $I$ drawn from the source at terminal A.

In a forward-biased p-n junction, as the applied voltage increases beyond the knee voltage, the current:

The reverse current in a Silicon diode is typically in the range of:

If a p-n junction diode is used as a half-wave rectifier with a capacitor filter, the ripple voltage will decrease if:

In a bridge rectifier, the DC power output is $P_{dc}$ and the AC power input is $P_{ac}$. The maximum theoretical efficiency $(\eta = P_{dc}/P_{ac})$ is:

A p-n junction diode has a saturation current $I_0$. If the forward bias voltage $V$ is much greater than $kT/q$, the current $I$ varies as:

If we apply a DC voltage to the input of a half-wave rectifier, the output will be:

The PIV of a diode in a bridge rectifier (with peak input voltage $V_m$) is:

In a center-tap full-wave rectifier, the Peak Inverse Voltage (PIV) across each diode (if $V_m$ is peak voltage across half the secondary) is:

In a half-wave rectifier, if the peak input voltage is $10\text{ V}$, the Peak Inverse Voltage (PIV) across the diode is:

In the bridge rectifier circuit shown in the diagram, $X$ and $Y$ are the input AC terminals, while $M$ and $N$ are the output terminals connected to a load resistor $R_L$. During the half-cycle where terminal $X$ is positive with respect to terminal $Y$, which of the following correctly describes the state of the diodes and the direction of current flow?

The use of a center-tapped transformer in a full-wave rectifier allows for:

If the peak input voltage to a full-wave center-tap rectifier is $V_m$ per half winding, what is the maximum voltage appearing across the diode when it is reverse biased?

Which of the following components in a power supply circuit is most likely to fail if the peak current rating is exceeded during the charging of a filter capacitor?

A $3$-phase full-bridge rectifier is used. If the input line-to-line RMS voltage is $V_L$, the average DC output voltage is:

For a bridge rectifier, the PIV is $V_m$. For a center-tap rectifier, the PIV is $2V_m$. If a design requires a DC output of $100V$ using a bridge rectifier, what is the minimum PIV rating required for the diodes (neglect drops)?

The charge on a hole is:

Which of these is a trivalent impurity?

Resistivity is the property of:

Which of the following elements is used to make p-type semiconductors?

A classification tree is used to sort solids into metals, semiconductors, and insulators based on their forbidden energy gap ($E_g$). Which of the following substances would be successfully sorted into 'Case 2' according to the logic provided in the diagram?

A research lab identifies two mystery solids based on their energy band configurations. Material X shows a distinct forbidden energy gap ($E_g$) of $0.67$ eV, while Material Y exhibits a structure where the valence and conduction bands have no separation. Based on this data, how should these materials be categorized?

If the temperature of a piece of Copper and a piece of Silicon are both increased, then:

Which of the following statements about the temperature coefficient of resistance ($\alpha$) is true?

In a material where the conduction band is partially filled at $0\ K$, the resistivity is mainly determined by:

If the forbidden energy gap of a material is $1.1\ eV$, it is transparent to which of the following radiation?