What happens when resistance is added in series with the field coil of a DC shunt wound motor?

Adding more resistance in series with the field winding will increase the speed as it decreases the flux. In shunt motors, as field current is relatively very small, Ish2R loss is small. Therefore, this method is quite efficient.

When the field winding is connected in series with the armature winding while supplying the load then the generator is called?

A shunt generator is a type of direct current electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current.

What is the function of a series resistor in the shunt field of a DC motor?

Field Rheostat Controlled DC Shunt Motor In this method, speed variation is accomplished by means of a variable resistance inserted in series with the shunt field. An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed.

When the series field opposes the shunt field the machine is referred to?

If the series field flux opposes the shunt field flux, then the machine is called the differentially compounded. It is connected in two ways. One is a long shunt compound generator, and another is a short shunt compound generator.

What is DC series generator?

It is a machine that works on the principle of electromagnetic Induction and it converts the mechanical input given to electrical energy. The field winding is attached in series with the armature winding of this type of machine.

What would happen if a series resistance is inserted in the field circuit of a DC?

In DC series motor, with increase in resistance of armature circuit increases the voltage drop in armature circuit and series field increases and therefore back emf decreases. Hence speed of DC series motor will reduce by inserting resistance in the armature circuit.