Quiz NETK08

If a transformer has no losses what does this mean?

• Power in equals power out

• Power in is less than power out

• Power out is less than power in

• Power out is double the power in

A transformer is associated with:

• Self-induction

• Electromagnetism

• Magnetic induction

• Mutual induction

A fluorescent luminaire emits light due to electricity passing through what?

• The starter

• The filament

• The gas

• The choke

Which configuration gives us two values of voltage?

• Star

• Delta

• Star two-phase

• Delta four-wire

In a three-phase system, what is the function of the neutral cable?

• Produces 230V

• Carries unbalanced currents

• Produces 400V

• Carries balanced currents

Which of the following may be defined as 'the capacity for doing work'?

• Energy

• Work done

• Power

• Velocity

RMS can be defined or seen as:

• The useful aspect of a sine wave

• The equivalent DC value

• 230V

• All the above

A relay operates through:

• Self-induction

• Electromagnetism

• Magnetic induction

• Mutual induction

If a conductor within an alternator cuts the magnetic field at 45 degrees the output will be:

• Maximum

• Minimum

• 50%

• 25%

An electromagnetic device which controls a large electrical supply by switching a smaller powered circuit is known as:

• A transformer

• A diode

• A relay

• An inductor