Fuses & MCB

The British standard (BS 1361, BS 1362) categorize ?

• Re-wire able fuses.

• Miniature circuit breaker.

• Transforms Fuse

• None of mentioned.

1- The fuses protected electrical circuits from ...... ?

• The water.

• The Over load current.

• The Electric shock

• The Overload and short circuit current.

What is the fuse rate if 20 volte of power source applied to 10 Ohms load in electric circuit?

• 3 Ampers

• 0.2 Ampers

• 2 Ampers

• 200 Amperts

The difference between a FUSE and Miniature Circuit Breaker (MCB) is that ....?

• Fuse can use many times but CB only once.

• Fuse only once and CB many times may used.

• Fuse and CB can use many number of times.

• All of mentioned.

A device capable of making and breaking load current and automatically breaking fault current is a

• BS 88 Fuse

• Isolators

• Miniature Circuit-breaker

• Disconnector

What is the Fault current (Iz) of type D Miniature circuit breaker If Rated current (In) 10A.

• 50 Amps.

• 100 Amps.

• 250 Amps.

• None of above.

One of the below devices is not used for protection.

• Switche

• RCD

• MCB

• Fuse

The fuse wire is enclosed in a transparent glass tube or bulb, and the whole unit is sealed off called ...?

• RE wirable fuse.

• MCB

• Cartridge Fuse.

• None of above.

The current which is rapidlly increase in very short time called.......?

• Reverse current

• overload current.

• Earth fault current.

• Short circuit current

The MCBs and Fuses protects ........ from damages.

• Humans bodies.

• Electric ciruits and its contents

• The wires only

• All of mentioned.