The value of d25/dt2 for a synchronous machine, rated 50MVA, 60HZ, M = 1.02MJ.s/degree, and Pa = 3,5MW, machine is O a. 4.356 rad/s2 O b. 0.424 rad/s2 O c. 3.431 rad/s2 O d. 2.358 rad/s2
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- Two gen. A and B operate in parallel. The station capacity of A is 50MW and that of B is 25MW. The full load speed regulation of station A is 3% and of B is 3.5%. Find the load sharing of 50MW between both the machine and the no load frequency is 50Hz. Don't use pen and copy.Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.DC machine question
- Comment briefly on the relationship between input and output power at varying excitation levels and on the relationship between excitation and power factor or reactive power, when the synchronous machine is connected to an infinite busbarWhat is use of solenoid coil in the pressure to converter? a. To produce magnetic field in the LVDT b. To change the LVDT output c. To bring back the pivoted beam normal position d. To produce linear displacement in bellowsA single phase full wave AC voltage controller has a resistive load of 5 ohms and an input voltage of Vs = 220 V (RMS), 50 Hz. The delay angles of both thyristors are set to 90 degrees. The maximum power that can be delivered to the load is: Select one: a. 5.65 kW b. 9.68 kW c. 11.52 kW d. None of these
- Two identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?Refer here for the specifications of the D400. a) What power output should you be able to supply from the 24V D400 at 15.4 m/s? b) If the wind drops to 2 m/s, what will the output power be? c) According to the performance graph what is the maximum power you can obtain from the 24V D400? There is a possibility of installing the turbine on top of a 20m high mast instead. Assuming that Zo=0.012, what would you expect the wind speed to be at that height? Use wind shear formula and assume Vref = 7.5 m/s at a height of Zref =10 m.The single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)
- The p.u parameters for a 500 MVA machine on its own base are: inertia,M=20 p.u.;Reactance X=2 p.u. What is the p.u value of inertia and reactance on 100 MVA COMMON BASE. Ans is 100,0.4Maz a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.3 milli seconds. Find D The maximum value of sinusoidal voltage waveform and i) The value of voltage at 2.1 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and 0 =40 degrees. on Vp Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximnum value = a) (ii) Value of voltage at 2.1 ms = b) Angular frequency =A generator is feeding the load. A second load will then be connected in parallel with the first load. The generator has an idle frequency of 61Hz and an Sp slope of 1MW/Hz. Load2 draws 800kW active power at 0.707 reverse power factor, while load1 draws 1000kW active power at 0.8 reverse power factor. What will be the operating frequency of the system after load 2 is connected? *Please explain the solution step by step