4. A 3-phase, 50 Hz induction motor is wound for 8 poles. If the full load slip is 2.5%, calculate i. synchronous speed ii. Slip speed iii. Rotor speed iv. Rotor frequency [CO3]
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- A 16-cylinder, 39.37cm x 55.88cm x 327-rpm, 4-cycle stationary, diesel engine is connected to a 3,125 KVA (80% Power Factor) generator. It also drives a 30-kW exciter. Assume a generator efficiency of 92% and determine the Break-Mean-Effective-Pressure (BMEP), in kg/cm2, at rated load.Show that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]A lap wound dc generator having 50slots with 15conductors per slot generated at no led emf of 400v when running at 1000 rpm suppose if the same generator is desired to genate 220v on open circuit. Suggest the speed at which it has to be rotated
- A 50Hz, 4 pole turbo alternator rated 150 MVA, 11kV has an inertia constantof 9 MJ/MVA. Find the (a) stored energy at synchronous speed (b) the rotoracceleration if the input mechanical power is raised to 100MW when electrical loadis 75MW and (c) the speed at the end of 10 cycles if acceleration is assumed constantat the initial valueA short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder and series field resistance 0.10 ohm. Armature resistance, shunt field resistance and series field resistance are 0.01 ohm, 52.2 ohms and 0.10 ohm, respectively. If the core friction and windage losses amount to 631 watts, the BHP of the driving engine is nearest toFind the speed of the induction machine in rpm, If the speed in rad/sec is 125 ...................... Answer
- An AC Asynchronous motor has the following parameters; Connected voltage,UN=400V Frequency,f=50hZ Nominal PowerPN=1kW, Breakdown Slip,SBD=0.289 Rotational speed (at nominal),nN=1410min-1 Number of poles=2 Nominal Efficiency ,դ=0.84 Calculate I)Calculate the Apparent Power of Nominal Operation,SL1,N1 II)Calculate the Reactive Power of Nominal Operation per single phase,QL1,N1 III)Calculate the Capacitance of CN1 which has to be connected parallel to the single Phase full power factor at nominal operationA 220V DC motor rotating with a speed of 1500 rpm (revolutions per minute) is connected to a mechanical load. The current of the motor is 10A. If the torque applied to the load is 13Nm, compute the total power loss in the motor. (Note: P=2πTf, where P=Mechanical power, T=Torque and f=frequency in Hz.)A 25 MVA turbo-alternator is working on full load at a power factor of 0.8 and efficiency of97%. Find the quantity of cooling air required per minute at full load, assuming that 90% ofthe total losses are dissipated by the internally circulating air. The inlet air temperature is20° C and the temperature rise is 30° C. Given that specific heat of air is 0.24 and that 1 kg ofair occupies 0.8 m3.
- A factory load consists of the following: input power of Induction motor is 40000 W at 0.76 power factor, input power of the synchronous motor is 24000 W with 0.81 power factor leading and lighting load of 10 kW at unity p.f. Find the annual electrical charges if the tariff is 390 baisa per kVA of maximum demand per annum plus 31 baisa per kWh, assuming the load to be steady for 2500 hours in a year. Annual electrical charges=______________________ Riala 20MVA, 12.2KV, 0.8 PF lagging Y- connected SG has a negligible armature resistance and syn. Reactance of 8.2Ω, the generator is connected in parallel with a 60Hz 12.2Kv infinite bus that is capable of supplying any real or reactive power with no change in frequency or terminal voltage. A) find the internal generated voltage at rated condition. B) what is the armature rated current. C) suppose that the generator is initially operating at rated condition. If the internal generated voltage is decreased by 5%, what is will be the new armature current?A 480V 50Hz Y‐connected six‐pole synchronous generator is rated at 100kVA at 0.8 PF lagging. It has a synchronous reactance of 2.56 Ω/phase and negligible armature resistance. Assume that this generator is connected to a steam turbine capable of supplying up to 113kW. The friction and windage losses are 2kW, and the core losses are 1kW. (a) What is the maximum output power available? (b) Construct the capability curve for this generator considering a max. load angle of 80. (c) Can this generator supply a line current of 200A at 0.6 PF lagging? Why or why not? (d) What is the maximum amount of reactive power this generator can produce? (e) If the generator supplies 40kW of real power, what is the maximum amount of reactive power that can be simultaneously supplied and what is the corresponding field excitation and load angle?