# Tutor profile: Nayyar M.

## Questions

### Subject: Electrical Engineering

What is the difference between a generator and alternator?

The major difference between the alternator and the generator is that in alternator the armature is stationary and the field system rotates whereas in the generator armature rotates and field is stationary. The armature of the alternator is mounted on the stationary element called stator and field winding on a rotating element. While the connection of a generator is just the reverse of it.

### Subject: Calculus

Function f defined by f(x) = | x | has no critical points. (True or False) ?

False. The derivative f '(x) is given by f '(x) = x / | x | f '(x) is undefined at x = 0 and therefore x = 0 is a critical point of function f given above. (see question 1 above).

### Subject: Physics

What is the difference between permeability and permittivity?

Permittivity is the capacity of a material to resist the formation of an electric field. On the other hand, permeability is the capacity of a material to allow the formation of a magnetic field.

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