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D.C. Generator
A magnetic field is produced by afield coil supplied with a D.C. current and a rotor is placed between shaped pole pieces and wound with an armature winding. The diagram above shows only one turn of the armature winding, but in practice there will usually be more than one. The ends of the armature winding are connected to two slip rings that rotate with the armature and the voltage generated is 'picked off' the rings by brushes that bear against the slip rings
The emf generated may be calculated either using the equation for the emf induced in a conductor of length l moving
in an electric field of flux density B webers/m 2
e=B.l.v
with a velocity v m/sec or by considering the rate of change of flux linkage with the armature coil. We shall use the latter method. Due to the shaping of the pole pieces, the flux threading through a particular armature coil is constant at + max as it turns from O4 to O1 and decreases linearly from +Ømax to -Ømin while the rotor is turning from O1 to O2 . It is constant again during O2 to O3 and then increases linearly during O3to O4. (ref graph)
Q. An elementary two-pole rotating machine with uniform air gap, as shown in Figure, has a stator-winding self-inductance Lss of 50 mH, a rotor-winding self-inductance Lrr of 50 mH
Encoder The encoder is a logic circuit which provides the binary code is output for each input each input signal. In other words we can say that it performs just op
Q. Sketch the depletion MOSFET drain characteristics The depletion-type MOSFET has a structure similar to that of the enhancement-type MOSFET with one important difference: The
Given an n-channel enhancement MOSFET having V T = 4V, K = 0.15 A/V 2 , I DQ = 0.5A, V DSQ = 10 V, and V DD = 20 V. Using the dc design approach outlined in this section, dete
Applications of TV picture TUbe
The project involves comparisons between di erent sampling methods, di erent estimation methods, numerical results using samples selected from a synthetic nite population, and a
What do you understand by ASSUME assembler directive? ASSUME: This directive will be utilized to map the segment register names along with memory addresses. The Synta
In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (A) Increased (B) Becomes zero (C) Remains unchang
construction and its working
Q. Illustrate the principles of operation of centralized SPC and distributed SPC and compare their performance. Ans: In centralized control, all control equipment is replac
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