Answer / tpfasil200

Direction of rotation of synchronous motor is determined b y its starting direction,as initiated by inducyion motor action. Thus, to reverse the direction of a 3 phase synchronous motor, it is necessary to first stop the motor and then reverse the phase sequence of the 3 phase connections at the stator. REVERSING THE CURRENT TO FIELD WINDINGS WILL NOT AFFECT THE DIRECTION OF ROTATION

Answer / tpfasil200

Direction of rotation of dc motor can be reversed in 2 ways
1.reversing current through armature and interpole windings(if they exist)
2.reversing current through field windings,ie,through shunt and/or series winding..but not through interpole windings(if they exist)
Reversing current through the armature is preferred because reversing current through the field windings involves breaking and making highly inductive currents of the field windings.Also field reversal of compound motors requires connections of both shunt and series windings to be changed..

Answer / prasanth

1.in alternator the induced emf is reduced due to retentive property of the field magnet when reversed.

what is meant by tranformer impedance?

0 Answers   Synergy,

---

what is 33 /11kv transformer bdv

8 Answers   NMDC, TPPL,

---

What is mean by sink and source in term of PLC and drives,where and how they used in logic

2 Answers  

---

i am completed diploma in ece,and working in ht and lt lines.so is elligible diploma in ece for get electrical C Licence?plse give ur opinion?

0 Answers  

---

The maximum demand of consumer is 2 kW and his daily energy consumption is 20 units. Its Load Factor is (1) 10.15% (2) 41.6 % (3) 50 % (4) 60%

2 Answers  

---

A wattmeter is marked 15 A/30A, 300V/600V and its scale is marked up to 4500 watt. When the meter is connected for 30A, 1600V, the pointer indicates 2000 watts. The actual power in the circuit in

1 Answers   Jindal,

---

Is a d.c.compound motor is use as a booster? how?

0 Answers  

---

What is the reason for low voltage in houses?

19 Answers   Maytas,

---

which of the following is the earliest known literary source of ancient india and indeed of mankind

1 Answers  

---

what is the use of conservator in a transformer?

6 Answers   L&T, TATA, Tata Motors,

---

please send me privious exam's queation papers of section engineer(electrical).

0 Answers   RRB,

---

what is the correct format to create a resume for interview??

0 Answers  

---