If the C relay is energized, the door motor field voltage will do what and door torque will do what?

When the C relay is energized, it completes the circuit that powers the door motor. As a result, the field voltage supplied to the door motor increases. This increased voltage enhances the motor's performance, allowing it to generate greater torque.

The door motor requires sufficient field voltage to operate effectively, transforming electrical energy into mechanical energy. Therefore, when the voltage increases, the door motor can achieve a higher torque output, which is necessary for operating the door smoothly and efficiently.

This understanding aligns with the principles of electric motors, where higher field voltage corresponds to increased torque production. The other options either suggest a decrease in voltage or torque, which does not occur when the C relay is energized.