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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)
Memory to Register This instruction is used to copy the contents of a memory locations whose address is specified by the HL register pair to any register. Before using th
A very widely used alternative form of synchronous motor is the ' indu c tion motor'. This has the advantage that it does not require an auxiliary motor to run the rotor up t
Q. A 10-kVA, 200:400-V, single-phase transformer gave these test results: • Open-circuit test (LVwinding supplied): 200V, 3.2 A, 450 W • Short-circuit test (HV winding suppli
draw a developed single simplex wave winding havig 17 number of coils and 4 number of poles
Q. A separately excited dc generator with an armature-circuit resistance Ra is operating at a terminal voltage Vt, while delivering an armature current Ia, and has a constant loss
History of Computers To understand the invention of microprocessor we have to see the history of computer first. The growth the computers is divided in different gener
A three-phase, wye-connected, cylindrical-rotor synchronous generator rated at 10 kVA and 230 V has a synchronous reactance of 1.5per phase and an armature resistance of 0.5 pe
Q. A60-Hz, 100-kVA, 2400/240-V(rms) transformer is used as a step-down transformer from a transmission line to a distribution system. Consider the transformer to be ideal. (a) F
Can add vectors using the parallelogram rule Can multiply a vector by a scalar - result is a parallel vector • length is scaled
The critical temperature above which the ferromagnetic materials lose their magnetic property is known as (A) Hysteresis. (B) Curie point.
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