Answer / subrata

1.due to frequency

Answer / shashidhara tm

AC machines require magnetic flux change at designed frequency... In case of India, 50Hz. For example, if no changing flux is given to an induction motor, it won't produce a rotating magnetic flux resultant on the rotor and it won't rotate the rotor. If no alternating voltage is given to a fluorescent lamp, it won't produce high voltage breakdown in the inert gas and emit UV.
But I'm not sure whether a DC motor works or not on AC voltage...

why in some trains in India Electric equipment such as Fans , tube light not work until locomotive or engine is attached to the train ??

1 Answers  

---

I have 1 KW, 3ph. 440v, 50 hz, cos(phi) .75, efficiency 75%(star delta connection)Motor. How to calculate line current & Phase current (1) Star connection (2) delta Connection

2 Answers  

---

Which power will flow first if we switch on a motor? Active or Reactive? How?

5 Answers   NPTC,

---

What do u understand voltage reg. of an alternator?

0 Answers   IOCL,

---

what is merz price protection

5 Answers   NHPC,

---

---

Where is servomechanism used?

0 Answers  

---

In chillers & freezers which gas will be use?

3 Answers  

---

Why relay connected R phase and B phase.?

1 Answers  

---

IR value for 30kw lt motor

1 Answers   Hofincons,

---

Dear all: Recently we got a question about Interface between PMS and SAP-PM.once we got a update message from PMS.we should set the deletional flag for functional location in SAP system.Is there any FM or BAPI to use?There are only functional location create and change provided by SAP. Best regards!

0 Answers  

---

What are effect of radio system in DCS Distributed control system ?

1 Answers   Sabic,

---

how to syncronize two dg sets

3 Answers  

---