In a A.C. series motor armature coils are usually connected to commutator

Solution (By Examveda Team)

In an A.C. series motor (also known as a universal motor), the armature coils are connected directly to the commutator without any intermediate components like resistors, reactances, or capacitors.

The term "solidly connected" means that the connection is direct and does not involve any impedance (resistance or reactance) or energy-storing elements (like capacitors).

Reason: Since the same current flows through the field and the armature in a series motor, any additional impedance would affect the motor's performance, efficiency, and torque characteristics.

Option A: through resistance – This would cause unnecessary power loss and is not standard in practical design.

Option B: through reactances – Reactances would distort the current and reduce torque; hence not used.

Option C: through capacitors – Capacitors are not used in the armature-commutator connection of an A.C. series motor.

Therefore, the armature coils are connected to the commutator solidly, making Option D the correct answer.