The correct answer is: A. Has its field winding consisting of thick wire and less turns.
A DC series motor is a type of DC electric motor that has its field winding connected in series with the armature winding. This means that the same current flows through both the field winding and the armature winding. The field winding is responsible for creating the magnetic field that interacts with the armature winding to produce torque. The armature winding is responsible for converting the magnetic field into mechanical work.
The field winding of a DC series motor consists of thick wire and less turns than the armature winding. This is because the field winding needs to be able to carry a large current without overheating. The armature winding, on the other hand, does not need to carry as much current, so it can be made with thinner wire and more turns.
The main advantage of a DC series motor is that it has a high starting torque. This means that it can start easily even when there is a heavy load on the motor. The main disadvantage of a DC series motor is that its speed is not constant. The speed of a DC series motor depends on the load on the motor. When the load is increased, the speed of the motor decreases. When the load is decreased, the speed of the motor increases.
Options B, C, and D are incorrect. Option B is incorrect because a DC series motor has a high starting torque. Option C is incorrect because a DC series motor cannot be started easily without load. Option D is incorrect because a DC series motor does not have almost constant speed.