What is the primary source of heat in an electric arc furnace?

• Chemical reaction

• Electric arc between electrodes and metal

• Induction coils

• Fuel combustion

In a direct arc furnace, the arc is formed:

• Between the electrodes and the furnace wall

• Directly between the electrodes and the metal charge

• Between two electrodes without contacting the charge

• Through induction coils

Which type of electric arc furnace is more suitable for melting steel?

• Indirect arc furnace

• Direct arc furnace

• Induction furnace

• Crucible furnace

In an indirect arc furnace, the heat is transferred to the metal:

• Directly through the arc

• By radiation from the arc to the furnace walls and then to the metal

• Through induction currents

• By conduction through the electrodes

What is a key advantage of an indirect arc furnace over a direct arc furnace?

• Higher melting capacity

• Lower electrode consumption

• Suitable for large-scale production

• Faster melting rate

What principle does an induction furnace use to melt metal?

• Combustion of fuel

• Electromagnetic induction

• Electric arc generation

• Chemical reaction

Which type of metal is an induction furnace most suitable for melting?

• Only ferrous metals

• Only nonferrous metals

• Both ferrous and nonferrous metals

• Only high-carbon steel

What is a major advantage of an induction furnace?

• Low initial cost

• Precise temperature control and clean melting

• High fuel efficiency

• Large-scale melting capacity

What is a limitation of an induction furnace?

• Inability to melt nonferrous metals

• High initial setup cost

• Slow melting process

• Inability to melt small quantities

What is the primary force used in gravity die casting to fill the mould?

• Centrifugal force

• Gravity

• High pressure

• Vacuum