Answer Posted / vishal ingle

DC machines are broadly of two types viz Motor or generator.

Both works on the principle of electomagnetic induction.

Generator:- Due to relative motion between magnetic flux
and winding, an emf is induced in it.

Motor: Due to the current flowing through the winding and
magnetic field flux, a force is experienced by the
conductor.

A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

1920

---

How npn and pnp transistor works

1140

---

what is the purpose of silicon dropper used in battery charger?

7456

---

What is the previous name of Cox's Bazar

1989

---

Please brief working principle & construction of permanent magnet AC Servo motor

2237

---

What is difference between Sample test and Routine test in safety standard?

1937

---

For a spring controlled governer the relation F = ar+b (F is the controlling force, r is the radius of rotation a and b are constants), indicates that the governer is

1219

---

xpression 'document.FrmQF.myemail' [

2002

---

i want to know that how the height of Ct ,cvt ,LA calculated on the basis of creepage distance

2614

---

what are the 4 rules to start the motor?

2122

---

What are the commonly used schemes for the bus zone protection?

1064

---

How eddy current generation support the idea of train braking?

1997

---

sir please send me iocl written test paper in my e-mail account. i'll be obliged to you........ thank u roshan

2214

---

What is the difference between in Fourier series and Fourier Transform. and please tell me the difference between both of them and the why we use them in communication system?

2026

---

What is big transformer parts and their function ? Ty

2213

---