M4 1-108

What gives the colour of an LED?.

• The active element.

• The plastic it is encased in.

• The type of gas used inside it.

Why is a diode put in parallel with an LED?.

• To protect it from AC.

• So it will work only above a certain voltage.

• So it will work only below a certain voltage.

In a semiconductor junction diode, electrons are the minority carriers.

• within the P region.

• within the N region.

• in both the N and P regions.

A junction diode.

• is similar to a vacuum diode but cannot rectify.

• has one p-n junction.

• can handle only very small currents.

To check the forward resistance of a diode with a multimeter, the lead connected to the positive terminal is put to the.

• anode.

• cathode.

• either anode or cathode.

A thyristor is commonly used for.

• overvolts regulation.

• voltage regulation.

• rectification.

The electrodes of an SCR are.

• gate, cathode, anode.

• source, drain, gate.

• anode, cathode, source.

What gives an LED its colour?.

• A gas.

• The cover.

• Composition and impurity of the compound.

The anode of a diode is connected to a +4V DC supply and the cathode is connected to a +2V DC supply. The diode is.

• forward biased not conducting.

• reverse biased not conducting.

• forward biased conducting.

A junction diode.

• can handle only small currents.

• is similar to a vacuum diode but cannot rectify.

• has one p-n junction.