Electrical Circuits Quiz

What is the main function of circuit breakers?

• To interrupt excessive current flow

• To increase voltage

• To decrease resistance

• To enhance power output

Which of the following is NOT a cause of overcurrent?

• Short circuits

• Excessive load

• Low voltage

• Arc fault

What happens when a fuse has 'blown'?

• It needs to be replaced

• It starts storing energy

• It becomes reusable

• It increases the circuit's voltage

What does the disconnection current rating (Ia) specify about a fuse?

• The voltage level it can handle

• The time it takes to blow

• The current value causing disconnection in a specific time

• The energy capacity it can store

What is a major problem when replacing the fuse wire in rewirable fuses?

• The wire is too short.

• The incorrect rating of wire can be easily inserted.

• The wire is too expensive.

• The wire is not available.

What is a concern for designers and duty holders regarding BS 3036 fuses?

• High cost

• Lack of reliability

• Complex installation

• Excessive size

How can BS 88 fuses be configured to assist?

• Selectivity

• Cost reduction

• Size reduction

• Color coding

What is a disadvantage of BS 88-3:2010 fuses?

• accurate current rating

• fusing factor 1.6–1.9

• more expensive than rewireable

• small physical size

Which current rating ensures the device remains serviceable?

• Icn

• Ia

• In

• Ics

Where can you find the table for rated short-circuit capacity?

• Page 45 in 'Electrical Circuits'

• Page 89 in 'Final Circuits'

• Page 23 in 'Basic Electronics'

• Page 67 in 'Advanced Mechanics'