Answer / sai bhargava

Dc machimes are designed like that angle betwean the stator flux and rotor flux is 90 degree to produce unidirectional torque

Answer / umesh

The torque formula for dc motor is T=k(current * flux)
The commutator with brush converts the dc into ac which produces alternating flux.It means both armature current and flux are positive or negative at the same time.

What is meant by celling voltage & current in excitor ?

0 Answers  

---

How convergengr of nr method is not dependent on selection of slack bus and how gauss siedel method depends?

0 Answers  

---

What will happen if induction motor is supplied with capacitive load?

1 Answers   NTPC,

---

what is the principal of transformer?

2 Answers  

---

what is suitable cable for 25 HP motor ? start with VFD ac supply 50 hz

3 Answers   Mac,

---

Difference between rating factor of cable and derating factor of cable?

0 Answers  

---

in industrial lighting in each circuit how many lamps can be given? and how much load can be put on each circuit? is there standard for this? please help me with the standard description?

3 Answers  

---

Which system use dc to dc high voltage gain A. Solar system B. Battery backup

1 Answers  

---

what is pure resistive circuit and pure inductive circuit

1 Answers  

---

what is power factor?

8 Answers   Adani, Blue Star, Power Control,

---

what is excitation system explain in detail with its working?

1 Answers   Toshiba,

---

IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?

2 Answers  

---