Protection Methods

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

• Atmosfer fuse

• Rewirable fuse

• cartridge fuse

• None of all mentioned

British Standard (BS 1361, BS 1362 and BS 88) related to:

• MCB

• Fuse

• RCD

• Earthing

The fuses and MCBs are connected to.....?

• Neutral wire

• Live wire

• Earth wire

• Ground wire

MCB Tripping characteristics set during ....?

• manufacture process.

• Shipping process.

• using on site process.

• storing process

Direct contact with power point need to use RCD with earth fault current rate of .......?

• 10mA

• 100mA

• 300mA

• 30mA

Green/Yellow wire (Earthing wire) is always considered as a....?

• part of the live circuit.

• Not part of live circuit.

• part of neutral line.

• part of lightning circuit.

S- Type RCD also known as ...?

• Advance type RCD

• Expensive type RCD

• Portable type RCD

• Delay type RCD

The Zs for 10mA RCD is 50 ohms.

Note: in this question. You have to know how to calculate the Zs value to get correct answer.

• TRUE

• FALSE

RCD is classed as a basic protection method.

• TRUE

• FALSE

For a 20A, Type C Miniature circuit Breaker the Iz value equal to ......

Note: in this question. You have to know how to calculate the Iz value to get correct answer

• 100A

• 200A

• 250A

• 150A