Assuming that the origin of F(u, v), Fourier transformed function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y prior to taking the transform of the image. If F and f are of same size, then what does the given operation is/are supposed to do?

Commercially, which of the following generators is called turbo-alternators or turbo-generators?

For relatively large sizes of synchronous machines, which of the following are used for providing closed circuit cooling?

Assuming that the origin of F(u, v), Fourier transformed function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y prior to taking the transform of the image. If F and f are of same size M*N, where does the point (u, v) =(0,0) shifts?

In a synchronous generator, the frequency of the generated EMF depends on ___________

A synchronous machine can be connected to an energy system only when ___________

In larger DC machines, the reason behind using fabricated steel instead of cast iron in the manufacture of yoke is?

Which of the following statements are correct in a DC machine, when the pole core is usually of smaller cross section than the pole shoe?

(i) smaller cross section requires less copper
(ii) larger pole shoe increases the air gap reluctance
(iii) larger pole shoe increases the flux per pole entering the armature
(iv) larger pole shoe reduces the mechanical strength
(v) larger pole shoe supports the field winding

In a DC generator, the commutator serves as a _________

Assuming that the origin of F(u, v), Fourier transformed function of f(x, y) an input image, has been correlated by performing the operation f(x, y)(-1)x+y prior to taking the transform of the image. If F and f are of same size M*N, then which of the following is an expression for H(u, v), the filter used for implementing Laplacian in frequency domain?

In a DC motor, the commutator serves as a ___________