Electrical Supplies and Systems Quiz P3 pt2

What is the purpose of the earth cable in an electrical system?

• To regulate the frequency of the current

• To reduce the power loss through power lines

• To increase the voltage of the current

• To provide a zero-volt path for potential fault current to flow to earth

What is the frequency of the alternating current (AC) produced by the rotor turning at 3,000 revolutions per minute?

• 50 hertz

• 30 hertz

• 40 hertz

• 60 hertz

What is the purpose of equipotential bonding in an electrical system?

• To keep all extraneous metal parts at the same potential or voltage

• To increase the current flow in the system

• To reduce the frequency of the current

• To regulate the voltage of the current

In a TN-C-S earthing system, where does the earth connection start?

• At the consumer unit

• At the outer sheathing of the supply cable

• At the main earth terminal (MET)

• At the incoming supplier's fuse, where it is connected to the neutral conductor

What is the purpose of the transformer in the electrical generation process?

• To increase the electromotive force (voltage) for distribution

• To force the steam onto the vanes of the rotor

• To measure the consumption of electricity

• To heat the steam to power the turbines

What is the voltage of a 230V supply entering a dwelling?

• 230V

• 400V

• 11kV

• 22,000V

What is the purpose of the National Grid's sub-stations?

• To increase the voltage of the electrical supply

• To transform the electrical supply down to 11kV and distribute it to local sub-stations

• To measure the consumption of electricity

• To heat the steam to power the turbines

What is the purpose of the supergrid in the distribution network?

• To measure the consumption of electricity

• To reduce the voltage of the electrical supply

• To increase the frequency of the current

• To compensate for power loss through power lines

What is the purpose of the supplier's 100A fuse in the electrical supply to a property?

• To measure the consumption of electricity

• To provide a high breaking capacity (HBC) fuse

• To increase the voltage of the electrical supply

• To heat the steam to power the turbines

What is the purpose of the sealed energy meter in the electrical supply to a property?

• To heat the steam to power the turbines

• To increase the voltage of the electrical supply

• To provide a zero-volt path for potential fault current to flow to earth

• To measure consumption of electricity