Electrical Workshop Laboratory Manual

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What type of fuse is used in low voltage, low current domestic circuits?

Cartridge fuse

High Rupturing Capacity fuse

Kit-Kat type fuse or Rewirable fuse (correct)

Fuse Wire

What is the main purpose of calcium carbonate in a cartridge fuse?

To prevent overheating of fuse

To increase the melting point of the fuse element

To reduce voltage in the circuit

To evolve gases when heated (correct)

What is the purpose of silica in a High Rupturing Capacity (HRC) fuse?

To prevent formation of an arc (correct)

To reduce voltage in the circuit

To increase the current carrying capacity

To increase the melting point of the fuse element

Why should a fuse be inserted in the live wire or phase of the circuit?

To prevent overheating of the connecting wires Signup and view all the answers

What is the main characteristic of a rewirable fuse?

It can be rewired if it melts Signup and view all the answers

What type of fuse is used in medium and high voltage installations?

High Rupturing Capacity (HRC) fuse Signup and view all the answers

What is the purpose of a fuse in an electrical circuit?

To protect the circuit against damage from excessive current flow Signup and view all the answers

What is the purpose of a thin wire in a fuse?

To melt when the current in the circuit increases beyond the normal value Signup and view all the answers

What happens to the current drawn from the supply in case of a short circuit?

It increases instantly Signup and view all the answers

What is the primary function of an Energy Meter in a household electrical system?

To indicate the total energy consumed Signup and view all the answers

What is the result of a fuse blowing off if it is inserted in the negative or neutral wire of the circuit?

The faulty circuit remains live Signup and view all the answers

What is the purpose of the fuse element in a High Rupturing Capacity (HRC) fuse?

To break due to overload Signup and view all the answers

What is the purpose of a three-pin socket?

To provide an earth connection to portable appliances Signup and view all the answers

What is the purpose of an ELCB in a household electrical system?

To prevent earth leakage currents Signup and view all the answers

What is the purpose of a fuse in a main switch?

To protect against overloads and short circuits Signup and view all the answers

What is the maximum number of points or connected load allowed in a circuit according to ISI recommendations?

10 points or 800 W connected load Signup and view all the answers

What is the purpose of an MCB in a distribution board?

To isolate a faulty circuit in case of a fault Signup and view all the answers

What type of switch is used as a main switch in a household electrical system?

Double Pole Iron Clad switch Signup and view all the answers