Electrical Engineering Questions

The knowledge of voltage regulation of alternators is crucial since:

The EMF induced by rotating flux in one phase leads the current by 90, this effect is identical to that of inductive reactance. The rotating magnetic flux generated by stator currents may be regaraded as being responsible for reactance of stator winding. Apart, the rotating stator flux revolves synchronously with poles, this reactance is referred … Read more

Short-pitched windings in alternators offer several advantages that contribute to improved performance and efficiency. Although there are many advantages, but major two advantages for using short pitched windings are:

Cylindrical or non-salient pole type alternators provide a large number of benefits over the salient pole type rotors. Given below is list of few advantages of cylindrical rotors:

For large alternators hydrogen is used instead of air because of following reasons. Given below are few reasons for this practice:

Overheating in transformers can arise from various factors, each posing a potential threat to the transformer’s performance and longevity. One common cause is overloading, where the transformer operates beyond its rated capacity, leading to increased copper losses and heat generation. Inadequate cooling systems, such as malfunctioning fans or radiators, hinder the dissipation of heat and … Read more

Small-sized distribution transformers are crucial components in electrical power distribution networks. The simplest and most common methods is the use of fuses. Fuses are designed to open the circuit in the event of an overcurrent, protecting the transformer from damage.

There are many cases in power systems when input to the primer mover fails. In such cases the prime mover stops converting mechanical energy to electrical energy. If alternator is operating in operating in parallel with other alternators, it will start operating as synchronous motor running at synchronous speed. This motoring condition is technically referred … Read more

The running torque of a synchronous motor is the constant torque developed during normal operation when the motor is synchronized with the supply frequency.