Properties of Electric Materials, Aswan University, Electrical Engineering

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What distinguishes the electron energy band structures of insulators and semiconductors when it comes to electron transitions from the valence band to the conduction band?

The temperature of the material

The number of free electrons

The density of the material

The size of the energy band gap (correct)

What is the main distinguishing factor between a rectifier (diode) and a normal conductor?

Rectifiers allow current flow in one direction only (correct)

Rectifiers have more holes than electrons

Rectifiers are made of copper wire

Rectifiers have lower resistance than normal conductors

What type of material dominates the p-side of a p–n rectifying junction diode?

Holes (correct)

Electrons

Neutrons

Protons

What condition is needed in forward bias for a p–n rectifying junction diode?

Positive battery terminal connected to the p-side Signup and view all the answers

Which property allows a diode to function as a one-way electrical conductor?

Energy band gap Signup and view all the answers

What is the purpose of doping a semiconductor in the construction of a rectifier (diode)?

To create more holes than electrons Signup and view all the answers

In a p–n rectifying junction, what happens when the negative terminal is connected to the p-side?

Creates a barrier to current flow, preventing electrons and holes from recombining Signup and view all the answers

Which type of transistor has a very thin N-type base region inserted between p-type emitter and collector regions?

P–N–P junction transistor Signup and view all the answers

What is the function of the gate in a MOSFET?

Modifies the channel's conductivity by applying an electric field Signup and view all the answers

What are the major types of transistors mentioned in the text?

Junction transistor and MOSFET Signup and view all the answers

What happens when a positive field is applied to the gate of a MOSFET?

Drives charge carriers (holes) out of the channel, reducing electrical conductivity Signup and view all the answers

What type of materials are dielectric materials?

Electrically insulating and nonmetallic substances Signup and view all the answers

What is the effect of connecting the negative terminal to the n-side in a p–n rectifying junction?

Encourages current flow, allowing electrons and holes to recombine Signup and view all the answers

What is the role of the insulating silicon dioxide layer in a MOSFET?

Forms an insulating silicon dioxide layer Signup and view all the answers

In which type of configuration is the Emitter-base junction in a P-N-P junction transistor forward-biased?

P–N–P configuration Signup and view all the answers

What dominates in MOSFETs, while junction transistors involve both majority and minority carriers?

Majority carriers Signup and view all the answers

Properties of Electric Materials, Aswan University, Electrical Engineering

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