Week 05: Types of fuses

Fuses are simple safety devises used to provide _______ current protection for electrical circuits

• above

• over

• behind

• under

• below

The essential component in a fuse is a ____ wire or strip that links two contact terminals together.

• Plastic

• Silicone

• Polymeric

• Metal

• Glass

A fuse can trip to open the circuit ________, so it needs to be repaired to complete the circuit again

• Thrice

• Twice

• Once

• Four times

• Five times

Cartridge fuses are commonly used to protect electrical _____ where high voltage ratings and currents are required.

• Appliances

• Motors

• Cars

• Installations

• Applications

Resettable fuses use a thermoplastic conductive element known as ______ temperature coefficient thermistor.

• Metallic

• Plastic

• Polymeric-

• Silicone

• Polymetallic

Fuse was patented by Thomas Edison in ____ as part of his electric distribution system.

• 1790

• 1890

• 1970

• 1980

• 1690

When the current in the circuit exceeds a certain value, the fuse will be broken by the heat generated by it.

• HRC fuse

• D – type cartridge fuse

• AC fuse

• DC fuse

• Thermal fuse

They oscillate at about 50-60 times every second from minimum to maximum.

• HRC fuse

• D – type cartridge fuse

• Cartridge fuse

• AC fuse

• DC fuse

Are available up to 600A and 600V AC.

• HRC fuse

• D – type cartridge fuse

• Cartridge fuse

• AC fuse

• DC fuse

At both sides of the fuse, the ceramic enclosure is made with a metal cap which is welded with fusible silver wire.

• HRC fuse

• Cartridge fuse

• AC fuse

• DC fuse

• D – type cartridge fuse