Unit 6 - Electrical Components (1)

An electromagnetic device that can operate one or several contacts is known as:

• A transformer

• A diode

• A relay

• An inductor

An electromagnetic device used in switching heavy duty current applications is known as:

• A transformer

• A diode

• An inductor

• A contactor

An electromagnetic device uses a small electrical signal to switch a much larger power circuit is known as:

• A transformer

• A relay

• A diode

• An inductor

A relay is made up of:

• Switch and contacts

• Solenoid and contacts

• Spring and contactor

• Field and contactor

A component that is magnetised only when an electric current flows through it is called:

• A switch

• A permanent magnet

• A electromagnet

• Light

Which effect of electricity is used by an inductor?

• Magnet

• Heat

• Chemical

• Light

In heavy duty applications, contacts are typically made from:

• Magnesium

• Carbon

• Mica

• Tungsten

A relay uses which of the following:

• Heating effect

• Chemical effect

• Magnetic effect

• Power effect

Which of the following does not operate through magnetism?

• Contactor

• Relay

• Electric motor

• Battery

The three effects of electric current are magnetism, chemical and heat. Which sequence is correct for electro-plating, cooker and relay?

• Heating, magnetism and chemical

• Magnetism. chemical and heating

• Chemical, heating and magnetism

• Heating, current and chemical