Action Of Commutator
It is seen that, the e.m.f. induced in the conductors is always sinusoidal and commutator converts this sinusoidal e.m.f. to unidirectional e.m.f.…
Torque And Speed Equations Of Dc Motor
Before analysing the various characteristics of motors, let us revise the torque and speed equations are applied to various types of motors.…
Load Characteristics Of D.C. Shunt Generator
Consider the d.c. shunt generator shown in the Fig. 1. The internal characteristics is E Vs IL while the external characteristics is Vt against IL.…
Demagnetising And Cross Magnetizing Conductors
The conductors which are responsible for producing demagnetizing and distortion effects are shown in the Fig.1. Fig. 1 The brushes are lying…
Kapp’s Regulation
Kapp had designed a diagram shown in Figure 1.42 to determine the regulation at any power factor. The description of the construction…
Losses In A Transformer
Two types of losses occur in a transformer: Core loss or iron loss occurs in a transformer because it is subjected to…
Per Unit Resistance, Leakage Reactance And Impedance Voltage Drop
Full-load voltage of a transformer can be expressed as a fraction of the full-load terminal voltage. Let I1fl be the full-load primary current, I2fl be the…
Polarity Test Of A Single-Phase Transformer
Polarity testing of transformers is vital before connecting them in parallel. Otherwise, with incorrect polarity, it is not possible to connect them…
Direction Of Rotation Of D.C. Motor
1. Direction of Rotation of Motor The magnitude of the force experienced by the conductor in a motor is given by, F…
D.C. Compound Generators In Parallel
Consider two compound generators 1 and 2 running in parallel as shown in the Fig. 1. As the voltage characteristics for the…