5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is 30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m². 1890 m/minute] 6. A thermal station has an efficiency of 15% and 1-0 kg of coal burnt for every kWh generated. Determine the calorific value of coal 15733 kcal/kg|

5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is 30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m². 1890 m/minute] 6. A thermal station has an efficiency of 15% and 1-0 kg of coal burnt for every kWh generated. Determine the calorific value of coal 15733 kcal/kg|

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.6P

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A 25 MVA turbo-alternator is working on full load at a power factor of 0·8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20o C and the temperature rise is 33 30o C. Given that specific heat of air is 0·24 and that 1 kg of air occupies 0·8 m .
A 25 MVA turbo - alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20 ° C and the temperature rise is 30 ° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m3. (890 m3 / minute
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 25 MVA turbo-alternator is working on full load at a power factor of 0·8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20o C and the temperature rise is 30o C. Given that specific heat of air is 0·24 and that 1 kg of air occupies 0·8 m3. [890 m3/minute] 6. A thermal station has an efficiency of 15% and 1·0 kg of coal burnt for every kWh generated. Determine the calorific value of coal. [5733 kcal/kg]
A 2-pole, single-phase alternator driven at 3000rpm require a mechanical input to its rotor of 30kW when it is delivering its full-load output of 30kW. Under this condition the fixed and variable losses are1100W and 2.8kW respectively, and the rotor field winding is supplied from a 110V dc source. Given that the full-load efficiency is 87%, determine. the frequency generated, the input driving torque on full-load and the rotor field current
At a location in Europe, it is necessary to supply 300 kW of 60-Hz power. The only power sources available operate at 50 Hz. It is decided to generate the power by means of a motor-generator set consisting of a synchronous motor driving a synchronous generator. How many poles should each of the two machines have in order to convert 50-Hz power to 60-Hz power?
Find the synchronous impedance and reactance of an alternator in which a given field current produces an amature current of 200A on short-circuit and generated emf of 50V on an open-circuit. T he armature resistance is 0.1 ohm. To what induced voltage must the alternator be excited if it is to deliver a load of 100 A at pf of lagging., with a ternminal voltage of 200V.
A 500-V, 50-kVA, single-phase alternator has an effective resistance of 0.2 Ω. A field current of 10A produces an armature current of 200A on short-circuit and emf of 450V on open circuit. Calculate (a) the synchronous impedance and reactance and (b) the full-load regulation with 0.8 p.f. lagging.
An 11 kV, three-phase, turbo alternator has a synchronous impedance per phase of(0,4 + j0,8) Ω and it supplies 2 kA at unity power factor to an infinite bus. Theexcitation is increased so that the emf is increased by 20%. Sketch a general loaddiagram and determine the following from this diagram: the armature current for maximum power output, the actual maximum power output
In a 3-phase induction motor, express the mechanical power developed, in terms of air gap power Pg.
A 489V shunt motor delivers 30hp at the shaft at 1120rpm. If the motor has an efficiency of 86% at this load, determine the (a) total input power and (b) line current.
A 4-pole alternator, on open-circuit, generates 200 V at 50 Hz when the field current is 4 A.Determine the generated EMF at a speed of 1200 rpm and a field current of 3 A, Neglect saturation in the iron parts.