FEC_Prelim Quiz

The region on either side of the junction which becomes free from the mobile charge carriers is called

• Energy gap region

• Charge free region

• Diffusion region

• Depletion region

Which is not one of the properties of semiconductor?

• 4 electrons in outermost orbit, in covalent bonding.

• atoms vibrate causes electron to break free from the bonds.

• Electron free leaves hole.

• Semiconductor has 2 types of charge carriers.

• all of the above are the properties of it

Doping of Semiconductors

• materials which can conduct electricity better than insulator, but not as well as conductors.

• The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

• when 4 electrons in outermost orbit.

which statement is correct? (the dark circles represent the electrons)

• p-type of the diode is connected to the negative terminal.

• Electron moves across the p-n junction, makes the diode forward biased

• current will not flow in the circuit

• reverse biased circuit

what is the meaning of rectification?

• a process of smoothing using a capacitor

• a process of adding impurities to pure materials

• a process of converting an alternating current into a direct current by using a diode.

The diagram is a process

• of doping

• of adding impurities

• of half-wave rectification

• of full-wave rectification

Select the correct polarity for forward bias

• 
• 
• 
• 

Q3 The cut-in voltage for silicon diode is approximately

• 0.2 V

• 0.7 V

• 1.1 V

• 1.4 V

When a PN junction diode is reverse biased

• Electrons and holes are attracted towards each other and move towards the depletion region

• Electrons and holes move away from the junction depletion region

• Height of the potential barrier decreases

• No change in the current takes place

Diode 

•  allows current to flow in one direction
•  allows current to flow in two directions
• is a resistor