A 10 MVA, 66KV, 50Hz, Y-connected 3-phase alternator has synchronous reactance of 0.635 Ù. It is working at full load at 0.8 lagging p.f. condition. Find torque angle, neglect armature resistance.
2088With a phasor diagram show the effect of increasing the field current of a generator supplying a constant real power and connected to a grid system.
1515Draw the wave shape of armature current in a generator subjected to a sudden three phase short- circuit at its terminals. Define various reactance of generator from this wave shape.
1632A 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.
1342A generating system will have a total capacity of 300 MW. Find the probable forced outage when the capacity is supplied by two 150 MW units. The operating probability of all units is P=0.98 and forced outage probability rate Q =0.02 .
2148A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.
2026How do the synchronizing lamps indicate the correctness of phase sequence between existing and incoming alternators?
1578Post New VECL Interview Questions
How do you handle exceptions in ruby code?
What do you understand by normal distribution?
how many type of admixtures for water stored structure?
What is Exo-skeleton?
How do you do less than or equal to in excel?
What is a company in sap ?
How to find schema of a table in db2?
Difference between start routine and conversion routine?
What is the difference between perl list and perl array?
Do array subscripts always start with zero?
In JCl , we have COND parameter.This holds comparison code and condition.It also has only and even parameters. ex: COND((4,GE),EVEN).what the comma mean here. is that 'and' or 'or'.
How load runner interacts with the application?
What are gradients in css?
I would like to know the kinds of questions that could come up with regard to backend testing? As i am new to this field would also know if backend testing is restricted only to sql and unix. If at all anyone has any information on the same kindly get back to me..thanks
How to shut down and overhaul the centrifugal pumps?
