Question { TCS, 314785 }

what is the difference between electrical & electronics

Answer

electrical devices r used for
transission&distribution,these work on AC-supply while
electroniccs devices used for utilise&work on DC-supply

Question { 8957 }

WHAT IS THE DIFFERENCE BETWEEN RESISANTANCE AND IMPEDANCE
IF IMPEDANCE IS MORE THAN RESISTANCE AT SAME VOLTAGE CAN WE
HAVE RELATION DERIEVED BETWEEN THEM

Answer

resistance is only opposing property of R while impeedance
is written as Z=R+jX here real part is resistance and
imaginary part is reactance so impdance is combination of
resistance and reactancewhen Z>R it mean ractance is rising
slowly

Question { 3742 }

IN A SMALL D.C GENERATOR, IF WE REPLACE THE LAMINATED
CORE ARMATURE WITH A WOODEN BLOCK OF SAME SIZE & SHAPE
AND WIND WIRES WOUND ON THE SLOTS OF WOODEN ARMATURE AND
CONNECTED TO THE COMMUTATOR.COMMUTATOR IS FITTED WITH BRUSH
TO RECEIVE INDUCED E.M.F.WHETHER E.M.F GENERATED OR NOT?

Answer

Generator work on principle of Electromagnetic induction,there is absence of magnetic core no E.M.F. will be generate

Question { NCC, 5455 }

what is purpose of using reactor in substations

Answer

Increase of impedance by using reactor so that high current can be reduce because we know that I=V/Z, and Z= sqrt(R^2+X^2)
this will secure from high fault current