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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.
VECL,
2605With 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.
VECL,
1990Draw 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.
VECL,
2249A 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.
VECL,
1932A 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 .
2653A 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.
VECL,
2527What is meant by load angle of an alternator? Upon what factors does the load angle depend?
VECL,
3022How do the synchronizing lamps indicate the correctness of phase sequence between existing and incoming alternators?
VECL,
2201
What is static resistance of a diode?
Name all parameters for virtual private networks. what are different metrics of virtual private networks
we have a crushing plant and our product is experiencing flakiness and elongation over limit for granite. what is the solution to this problem? how can it be avoided and what to do differently? It is not ok for batching plants
what is the current rating of both primary and secondary of 500kva,33kv./400v.distribution transformer?
Please brief me about number of pole in alternator.In single phase alternator coils are connected in star or series. How to calculate frequency for the same.
Is it possible to obtain 480v or 550v in single phase output by giving the input to 230v to a single phase torodial type transformer without using a stepup transformer?
Which conducts heat faster steel copper or brass?
How to calculate flow of water delivered by pump when pressure & size of pipe line is given
how to count number of 3's in 100
how to calculate the change over time for star delta starter for different KW motor?
what is the voltage between earth to neutral in lift.
design a 3 bit synchronous and asynchronous counter using T- flipflop
Explain the working principle of Synchronous Generator and Assynchronous generator?
What is silk fiber?
How long the oxygen last for passenger in an emergency?
