Explanation: Faraday’s second law of electrolysis states that, when the same quantity of electricity is passed through several electrolytes, the mass of the substances deposited are proportional to their respective chemical equivalent or equivalent weight.

Explanation: Faraday’s First Law of Electrolysis states that, the chemical deposition due to flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it. i.e., mass of chemical deposition.

Explanation: The accuracy of the tool shape directly affects the work piece accuracy, since configuration of the cavity produced cannot be more accurate than the tool the produces it.

Explanation: The materials the find wide applications in the manufacture of tools for ECM are aluminium, brass, bronze, copper, carbon, stainless steel, monel and reinforced plastics. All these materials are easy to machine.

Explanation: Loss of hydrogen reduces the electrical conductivity of the electrolyte. Also due to loss of water by evaporation or being carried off by hydrogen gas generated, concentration of the solution increases which affects viscosity and electrical conductivity.

Explanation: Shaping the tool is usually not a problem since all the materials are easy to machine. Cold forging and electroforming are favourable methods of tool making.

Explanation: Precipitate formation increases the effective viscosity and interferes with the process in the work-electrode gap. Also, salt absorption by the precipitate reduces the concentration, thus reduces the conductivity.

Explanation: The solubility of the products of the reaction increases with rising electrolyte temperature. Also, increase in temperature of the electrolyte speeds up the electrode reaction and reduces the over-voltages required.

iii. limit the rise in temperature of the electrolyte when working at higher current densities.

Explanation: Increased pressure of the electrolyte above atmospheric pressure increases the boiling point of the electrolyte point of the electrolyte, reduces the over-voltage required at the tool surface and decreases the volume of generated hydrogen due to which it displaces less electrolyte permitting the use of higher current densities.