Answer / shubham

In a synchronous generator according to its eq. ckt diagram
there's a simple eqn showing the relation between excitation
ad op voltage
E(excitation emf)- {I(armature current)*Z(synchronous
impedence))=V(terminal emf)

Answer / rahul

first find e.mf generated in armature conductor,

EB=p×phi×n×z/(60a)

the output

V=Eb-IaRa

Difference between control junction box (cjb) and power junction box(pjb)?

0 Answers  

---

now a shunt motor is practically a constant speed motor , then how does it meet the increase or decrease in the load ?

1 Answers  

---

How to select batteries required for ups and the inverter if we Known load? And how AH is selected of battery?

0 Answers   Vodafone,

---

how to calculate compresor capacity?

0 Answers  

---

can we connect both delta and star to the transformer secondary and for what reason?

5 Answers   Power Grid,

---

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

0 Answers  

---

What is MS-EXCELL?

0 Answers   NTPC, Siemens,

---

what is the difference between earthed and unearthed cable?

24 Answers   Cords Cable, Essar, Torrent Power,

---

in dc machine airgap is there b\w stator and armature but by conduction emf is generated how & what is conduction

1 Answers  

---

What is application of isolation transformer & How it works.

2 Answers   BARC,

---

can i know how to design overcurrent setting and earth fault for 11kv & o.433kv system assuming tx 1000kva.

2 Answers  

---

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

1 Answers   KSEB,

---