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Networks Analysis and Synthesis - Engineering

Q1:

The frame of electric motor is connected to three plates having earthing resistance of 10 Ω, 20 Ω and 30 Ω respectively. The materials of the three plates are copper, aluminium and iron respectively. The percentage of energy dissipated by 10 Ω earthing plate

A is more than 50% of total energy

B is less than 50% of total energy

C depends on the materials of the three plates

D may be more or less than 50% of total energy

ANS:A - is more than 50% of total energy

The parallel combination of 30 Ω and 20 Ω is 12 Ω. Since 12 Ω and 10 Ω are in parallel, the 10 ohm plate draws more than 50% current and dissipates more than 50% energy.