What happens when the field of an alternator connected to
infinite bus is suddenly removed?
Answer Posted / ashwin.k
when supply 2 field is removed......then stator winding(in
higher rated m/c)is subjected to bus bar volage of infinite
bus.....thus alternator acts as INDUCTION MOTOR....amazing naaa
| Is This Answer Correct ? | 2 Yes | 5 No |
Post New Answer View All Answers
what is the mechanical safety of DG ?
what are the analog quality input for protection function?what are minimum reqiments?
What is the ratio of Booster transformer?
Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?
how to select proper cable for ct wiring so that drop within the limit.
1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.
After doubling voltage from solar cells & use step down voltage transformer can we get high current output with low voltage.
What are the advantages of stationary armature and rotating field system?
Why do we need interlocking in a HT metering or Ring main unit switchgear?
How to design the no. of ceiling fans required in 5mtr X 10 mtr X 3 Mtr hight room?
What is the classification of hydro projects based on installed capacity?
what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY
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 0for 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.
what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?
WITCH CARDS IN USE IN FIRE CONTROL PANEL.