Electrical Engineering. Laplace Transform and Circuits. 8 Questions Need help Thanks. Please see attachment.

Suppose the modulated signal at the receiver is ????(????) = ????(????)cos(???????????? + ????????), show that an alternative asynchronous AM demodulation involves the following operations, assuming t

A synchronous motor is supplying a certain load. In order to stop the motor, it is essential to switch off first the a.c. supply and then its field current. Explain the reason.

In a synchronous motor operating at zero power factor lagging with respect to excitation voltage, the armature reaction mmf is ……………………..

The field of a synchronous motor is excited from a ………………. source.

The power factor of a synchronous motor can be controlled by varying the …………………….

An OVER-excited synchronous motor has a …………………… power factor.

In a synchronous motor, for maximum power the load angle should be ……………………

In a synchronous motor, the angle between the rotating stator flux and rotor poles is known as ……………………. angle.

what is a buck converter? since it is applied in power systems, explain its operation?