Answer / varun devulapalli

for any machine whether it may be rotating or stationary, the common losses are the iron losses and the copper losses. But in additional for the rotating machines there are mechanical losses. Iron losses comprise of two losses i.e., hysterisis loss and eddy current loss. Hysterisis loss depends on the type of the material used and its B-H curve. Eddy current loss is due to the induction of eddy currents in the armature material. these eddy currents are not useful but they create heat in the machine. so to reduce eddy current losses we use thin laminations in the core with a very thin insulation like paper in between each lamination.
Copper losses are divided into field copper loss and the armature loss. copper losses are the ohmic losses which arrive due to the resistance in the winding. square of the current multiplied by the resistance gives the copper losses.
Mechanical losses comprise of frictional and windage losses. frictional losses arive due to the ageing of the bearings. windage losses are due to the wind that oppose the rotation of the machine in a direction.
less losses leads to maximum efficiency.

what is the principle of operation of tungstun bulb ??

2 Answers   IOCL,

---

what is differnce between grounding and earthing or both are same?

3 Answers  

---

WHAT IS MEANT BY SHEATH VOLTAGE IN 132Kv cable?

0 Answers   L&T,

---

what should be 3phase motor capacity or rating to connect in star connection. what should be 3phase motor capacity or rating to connect in delta connection. what should be 3phase motor capacity or rating to connect in star delta connection

1 Answers  

---

why open circuit test is conducted on hv side and short circuit test is conducted on lv side of a transformer ?what is the reason for it ?

3 Answers   HCL, NTPC,

---

What will be the current after disconecting the bus bar or cable before discharging ?

2 Answers   Sodexo,

---

Is neutral transformer can be called as control transformer?

0 Answers  

---

Can motor act as generator (OR) vice versa? explain how does it do please post the answer technically

11 Answers   GM General Motors,

---

depletion layer will form beforre biase or after bias ?

2 Answers  

---

checking procedure of capacitor based motors.used in fans etc?

0 Answers   Badve,

---

what's the requirement of Dy11d0 connection of 3 phase transformer?what's use of it?

0 Answers   Thermal Systems,

---

What is BMS System???Types...

4 Answers   Emerson,

---