Why is shunt field resistance greater than series field resistance?

Shunt field has more number of turns which are thin. Similarly, series wounded field has less turns of thick conductors. Each of these are done to give suitable resistance as per requirement. Series windings carry more current and should allow compratively less voltage drop.

Why does the series winding have low resistance compared to the shunt field winding?

The voltage drop across series field winding gets added to the voltage drop across armature winding while deciding the back emf. This voltage drop must be very small. Hence as the current through series field winding is high, in order to keep voltage drop across it to a small value, its resistance is very low.

Why the armature winding of DC machine is designed for such a low resistance?

So, initially, current induces in the armature conductors of a dc generator only due to the residual magnetism. Therefore, the field winding carries whole of the load current (armature current). That is why series winding is designed with few turns of thick wire and the resistance is kept very low (about 0.5 Ohm).

Is the field of DC shunt generator of comparatively low resistance or high resistance?

The shunt field, therefore, must have a comparatively high resistance that it does not take too great a proportion of the generator current. The compound generator is similar to the shunt, but has an additional field winding connected in series with the armature or load.

Which has higher resistance shunt or series?

Explanation: Series field winding is used when wire is thick. Explanation: The shunt field winding is provided with a large number (hundreds or even thousands) of turns of thin wire and is excited from a voltage source. The field winding, therefore, has a high resistance and carries a small amount of current.

Why does a shunt field winding have a large number of turns compared to the series field winding?

The shunt (field) windings of a DC shunt motor are made of smaller gauge wire, but they have many more turns than a series-wound DC motor. The high number of turns allows a strong magnetic field to be generated, but the smaller gauge wires provide a high resistance and limit the current flowing through the shunt coil.

Why does the field winding of a series DC machine have less number of turns than that of DC shunt machine?

The field coils of DC series motor are wound with relatively fewer turns as the current through the field is its armature current and hence for required mmf less numbers of turns are required.

Why is armature winding placed on the rotor of a dc machine?

The armature winding of a dc machine is placed on the rotor to facilate commutation ie to convert the alternating voltage produced in the winding into direct voltage at the brushes. In a DC machine one part has to rotate with respect to the other.

Why does the field winding of a series dc machine has less number of turns than that of DC shunt machine?

The field coils of DC series motor are wound with relatively fewer turns as the current through the field is its armature current and hence for required mmf less numbers of turns are required. To understand that better lets look into the voltage and current equation of DC series motor.

How the armature resistance are determined?

A practical way to measure the winding resistance is to use the Ohm’s law: Resistance = Voltage / Current. If you apply a power source to the windings and measure the voltage and current flowing through them, a simple division will yield an accurate value for the resistance.

Which winding has more resistance in DC shunt motor?

field winding
Keeping these two above mentioned criterion in mind a DC shunt motor has been designed in a way, that the field winding possess much higher number of turns to increase net flux linkage and are lesser in diameter of conductor to increase resistance (reduce current flow) compared to the armature winding of the DC motor.