Earthing Systems

Ground resistance should be as designed such that

• grounding resistance should be as low as possible

• grounding resistance should be as low as possible

• grounding resistance should be always zero

• none of above

Generally grounding is provided for

• safety of equipment only

• safety of human beings only

• safety of equipment & human beings

• none of above

Moisture content in soil ______ the earth soil resistance

• increases

• decreases

• does not affect

• none of the above

Fuse wire should possess

• High specific resistance and high melting point

• High specific resistance and low melting point

• Low specific resistance and low melting point

• Low specific resistance and high melting point

H.R.C. fuses stands for

• High rating of current

• High rupturing capacity

• High resistance capacity

• None of these

Miniature Circuit Breaker is a

• rewireable breaker

• circuit breaker

• fuse

• none of above

Rewireable type of fuse is also called as

• easily replaceable fuse

• Cartridge fuse

• semi-enclosed fuse

• None of above

MCB operation works on principal of

• Electromagnetic sensing devices

• Thermal sensing devices

• Electromagnetic & Thermal sensing devices

• none of the above

Filling material in HRC fuse is used for

• insulation of fuse element

• fill the empty space

• absorb the heat produced

• none of above

Advantage(s) of MCB :

• Simple to resume the supply

• Handling is electrically safer

• Reusable

• All of the above