Answer / ashutosh jha

An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor.

how hydrogen or helium is a cooling agent for alternator./ generator of big size.

1 Answers  

---

Why we use shunt coil in breaker??????????

7 Answers  

---

advantage of using 110v than 230v

1 Answers   NTPC,

---

Did RMU have ct and pt ?

0 Answers  

---

Why in USA supply voltage parameters(230V,60Hz)are different,is there any advantage please brief.

1 Answers   APC, DRJ ARDE,

---

---

Write masons gain formula.

0 Answers  

---

we use 400/5A ct and 35/roor3KV,/0.1/root3KV,0.1/root3KV pt ratio. What is the multiple factor of this meter.

0 Answers   ABB,

---

How much is the starting current for HPMV lamps. How many lamps can u wire in a circuit

1 Answers   Technip,

---

Can any horizontally mounted motor be used as vertical?

5 Answers  

---

Can Anyone suggest the Standards (IEC or IS) for selecting copper current density?

0 Answers  

---

Suppose am having the PF value .8, so how can we say that is it lagging or leading?

11 Answers   Bhel,

---

We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

---