Earthing is different from grounding generally because grounding is represented at faulting of transmission line or equipment but earthing is used for human protection.

Basically earthing and grounding are same thing  earthing is used for human protection it contain low resistance path.grounding is used for equipment portion it contain zero potential.

The dc output of the full wave rectifier is average value the amplitude of the sine wave. In short multiply the r.m.s value of the ac input voltage by its form factor (1.11 in case of pure sine wave) ...

i know the output will be dc my question is how much dc voltage will be the output

In case of an ideal current source , it will deliver same current irrespective of the load connected to the secondary terminals thus proper transformation will not take place in order to maintain constant flux.

I assume that by current source you mean constant current source. In such case the primary and secondary voltage of the transformer will depend on the impedance of the transformer and the load. The lo...

DC generator although produces a.c,it must be converted to d.c by rectifiers in order to store in the batteries and to it supply must be dc,so in cars instead dc generators alternators are used.

An alternator is more reliable than a dc generator as it doesn't have commutators and brushes. 3 phase alternator gives a much smoother output than a single phase one when rectified. Now-a-days alternators have totally replaced dynamos (dc generators) in automobiles.

MCBs have relatively low breaking capacity and sluggish compared to fuse. Fuse is used when cost of cable is a factor. If MCBs are used proper cable sizing must be done considering fault level and duration.

Fuse is old technology to break d circuit in fault. MCB is for low fault currents starting 6Amps to, 63Amps either 1Phase or 3Phase. And (b,c,d,k) are depends on the fault current and the location u r going to use. MCCB for higher currents more than 63 Amps that to in 3 Phase only.