This lesson covers the testing and efficiency calculation of Direct Current (DC) machines. It delves into the Swinburne test, a no-load test used to predict the efficiency and performance of a machine. The lesson also discusses the limitations of the Swinburne test and introduces an alternative test that involves two mechanically coupled machines operating as a shunt motor and a generator. The lesson further explains the field test carried out for DC series motors. It also provides a detailed explanation of how to calculate the efficiency of a motor and a generator. The lesson concludes with the condition for maximum efficiency in a shunt motor.

The Swinburne test is a no-load test used to predict the efficiency and performance of a machine. However, it does not provide accurate results for temperature rise and commutator segments.

An alternative test involves two mechanically coupled machines operating as a shunt motor and a generator. This test allows for the observation of the machine's behavior under different load currents.

The field test is carried out for DC series motors. It involves two similarly rated machines, one operating as a motor and the other as a generator.

The efficiency of a motor and a generator can be calculated by subtracting the ohmic losses from the input power and dividing by the input power.

The maximum efficiency in a shunt motor occurs when the variable loss is equal to the fixed loss.

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