ield circuit resistance in DC shunt generator should be ………… critical field resistance.*equalhigher thanequal or higher thanless tha

To determine the relationship between the field circuit resistance and critical field resistance in a DC shunt generator, we first need to understand these concepts:

1. Field Circuit Resistance: This is the resistance of the winding through which the field current flows. It affects the amount of current that can flow in the field winding.

2. Critical Field Resistance: This value indicates the maximum resistance that the field circuit can have while still allowing the generator to build up its voltage. If the resistance exceeds this value, the generator will not be able to maintain enough field current to induce the desired voltage.

Answer Analysis

• If the field circuit resistance is equal to the critical field resistance, the generator can just achieve self-excitation but will struggle to build up voltage.
• If the field circuit resistance is higher than the critical field resistance, the generator will fail to build up voltage.
• If the field circuit resistance is less than the critical field resistance, the generator can generate voltage more effectively due to higher field current.

Final Answer

The field circuit resistance in a DC shunt generator should be less than the critical field resistance to ensure proper voltage build-up.