Answer / kj

Yes
By replacing the field winding with permanent magnets. The
problem with doing this is that the output voltage is
controlled only by the speed of the alternator. This means
that at constant speed (frequency)the voltage will fall as
the load is increased. If the voltage must be constant the
speed must be increased with load. So the frequency will
not be constant.

how choose conductor &caple&wire depending upon the load

2 Answers   HCL,

---

lightning current is ac or dc..?????

7 Answers  

---

During Millivolt drop test current leads are applied in the extreme ends and voltage leads are given just before the current leads.. what will be the difference if voltage leads are given in the extreme ends? and why?

1 Answers  

---

If we tell 60 sq.mm. 3-1/2 core cable,then what does it mean ? 1) Each core section in the whole cable is of 60 sq. mm. 2) The whole cable is of 60 sq. mm. which is sub-divided into 3-1/2 core.

3 Answers   Cura HealthCare,

---

why the power factor in inductive load is lagging while it is leading in capacitive load?

6 Answers  

---

gd eve frndz my qstn is how convert sound energy to electrical energy

1 Answers   HCL,

---

A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

0 Answers  

---

how calculate cable size in squre mm, when the load is given by in kw? do u have current rating chart of elctrical cables?

4 Answers  

---

when the direction of a 3phase induction motor is reversed , is there any losses increases?

5 Answers   IOCL,

---

Hi,My name is ranms i want to know the machine vibration related problems.post me if any body knows. 1) Possible causes of machine horizontal vibration high? 2) Possible causes of machine vertical vibration high? 3) Possible causes of machine axial vibration high?

1 Answers  

---

How many homes can a 500kva transformer supply in S.A

1 Answers  

---

Is it recommended to apply H.pot test for new cables segments after terminations or joints, however, this cable has been tested before at the manufactor by the vendor ? or only we can apply megger tests ?

1 Answers   Centroid,

---