0. A short shunt compound dc generator supplies 7.5 kW at 230 V. the shunt field, series field and armature resistance are 100, 0.3 and 0.4 ohms respectively. Calculate the induced emf. a. 253.8 V b. 255.7 V c. 259.6 V d. 257.1 V
Q: A long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 500,…
A:
Q: The terminal voltage of a 150 kW series generator is 600 V at rated load. Determine the generated…
A:
Q: A short-shunt compound generator delivers a load current of 30 A at 220 V, and has armature,…
A:
Q: A 230V, shunt generator has Ra = O.07 π and Rf = 77.5 - 16 π. The generator has a total mechanical…
A: We are authorized to answer two subparts at a time, since you have not mentioned which part you are…
Q: A separately excited dc generator has VF= 150, Rp= 10 , Radj= 4 , RA= 0.065 , the prime mover…
A: Field current =voltage across field winding/(total resistance of field circuit). Total resistance of…
Q: How many poles should a 60-Hz generator have, if it is connected to a turbine operating under a…
A:
Q: ) Name the component in the generator which produces unidirectional current. i)Draw the experimental…
A: The shunt generator delivers 160A (IL) at a terminal voltage of 230V (Vt). The shunt field current…
Q: No. 8 problem A shunt generator has the following open-circuit characteristic at 800 r.p.m.…
A: Drawing OCC from data given:
Q: A load consisting of induction motors is drawing 40 kW average real power from a 110-V (RMS), 6 Hz…
A:
Q: (c)Derive EMF Equation of the DC generator
A: Let ∅ = flux per poleZ = total armature conductorA = number of parallel pathP = number of polesN =…
Q: dc shunt generator 50 V at the load 6A, rotating 700 r.p.m at the torque 4 N.m. Find the efficiency…
A:
Q: A long-shunt d.c. compound generator supplies 25A at 90V. The resistance of armature, series field…
A: This is an easy question based on long shunt compound generator . In this we are having values of…
Q: A 200-kW. eight-pole DC generator operating at 850 r/min has a generated emf of 200 V. Determine (a)…
A: The solution can be achieved as follows.
Q: A single-phase alternator connected to 6,600-V bus-bars has a synchronous impedance of 10Ω and a…
A:
Q: A 250 MW, 50 Hz power system has a speed regulation of 5% based on its own rating. Due to a sudden…
A:
Q: Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80…
A: Given information a three phase synchronous machine which is operated as a generator is, Rated…
Q: A 6600V, 3-ph, Y-connected alternator has a synchronous impedance of (0.4+j6) ohm per phase.…
A:
Q: An 8-pole d.c. shunt generator with 778 wave-connexted arınature conductors running at 500r.p.m.…
A:
Q: A cylindrical rotor machine connected to an infinite bus bar is delivering active power of 1,1 p.u.…
A: Given that active power (P)=1.1 pu. Reactive power(Q)=0.3 p u.…
Q: Derive net RMS EMF induced in the stator winding, when there is an influence of 1st, 2nd harmonics.
A: EMF induced due to first harmonics is = RMS value is =
Q: 4. A 20-kW, 250-V dc series generator has armature and series field winding resistances of 0.095 Q…
A: Given 20kW 250V Armature resistance = 0.095 Ohms Series field winding resistance=0.16 Ohms
Q: A) A generator has the following ratings: 6-poles, 50 Hz, 33 KV, 80 MW and a 0.9 power factor lag.…
A: Given that P=6-poles, f= 50 Hz, VL= 33 KV, Power P= 80 MW and Cos(phi)= 0.9 power factor lag.…
Q: Q1.A. The following results give the open circuit characteristic of de shunt generator running at…
A: We are authorized to answer one question at a time, since you have not mentioned which question you…
Q: = A compound generator is supplying a load of 100A at 220V, Ra 0.0192, R4002 and 0.04 $2. Find E,…
A: In Q6 you didn't mention the type of machine so we go ahead and providing the solution for Q7. If…
Q: Two, 3phase alternators connected in parallel are driven by a hydraulic turbine whose speed- load…
A: Given Two three phase alternators connected in parallel are driven by hydraulic turbineThe…
Q: A shunt generator has the following open-circuit characteristic at 800 r.p.m. Field amperes : 0.5…
A: A shunt generator has the following open-circuit characteristic at 800 r.p.m. To find the O.C volt…
Q: 5. A 3-phase, 50 Hz, star-connected, 1000 KVA, 2300V alternator gives a short-circuit current of 400…
A: DC resistance=0.412 Ω 3Q , 50H , YOpen circuit voltage=1328 voltShort circuit…
Q: A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 2,…
A: Load current =power delivered to load/terminal voltage. Voltage across field winding =terminal…
Q: A shunt generator supplies a 25kW load at 235V through cables of resistance, R = 116mn. If the field…
A:
Q: A separately excited dc generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. Ra = 0.05 N, Rf…
A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: If, in a 3-4 alternator, a field current of 50 A produces a full-load armature current of 200 A on…
A: Given, A 3-φ alternator has, Field current of 50 A Open circuit line voltage, Vocline=1730 V Open…
Q: Air flowing at 604000 kilograms per second at a speed of 57 kilometres per hour. Assume the power…
A: The rate of the air flow is 604000 kilograms per second. The velocity of air is 57km/hr.
Q: Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating…
A: The formula for the Kinetic energy is given as:
Q: A 2300-V 1000-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has asynchronous…
A:
Q: A DC shunt generator supplies a load of 27 kW at 210 V through the cables of resistance, R = 126 mΩ.…
A:
Q: An 11-kV, 1000-kVA, 3-phase, Y-connected alternator has a resistance of 2 0 per phase. The…
A:
Q: A dc shunt generator has a shunt field winding resistance of 100 ohms. It supplies a load of 5 kW at…
A: Given : In the given circuit the they have mentioned a DC shunt generator circuit. They want to…
Q: 4) A 40-kW induction motor, with a lagging power factor of 0.76 is supplied by a 120-Vrms, 60-Hz…
A:
Q: 5.115. A star-connected synchronous machine, with Z, 1+j 102 per phase, is synchronized with an…
A:
Q: A 4 pole shunt generator delivers 195 A at a terminal voltage of 245 V. Ra and Rsh are 0.032 and 702…
A:
Q: a) b) The value of excitation current required for full load current at 0.7 pf lagging…
A: Synchronous generator converts mechanical energy to electrical energy. The OCC curve is drawn…
Q: A 3-phase, star -connected turbo-alternator, having a synchronous reactance of 10 Ω per phase and…
A: Synchronous reactance (Xs) = 10 Ω Armature current (Ia1) = 220 A Power factor, cos φ1 = 1 line…
Q: A long-shunt d.c. compound generator supplies 100A at 290V. The resistance of armature, series field…
A:
Q: A long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 50ohms,…
A:
Q: A critical factor in the section of a generation of a generator for a particular application is that…
A: From a customer point of view, the important factors that customer look for while purchasing the…
Q: A d.c. series generator supplies the load of 5 kW at 250 volts. The armature resistance and series…
A: Solution: Given data ; d.c. series generator ; output =5 KW , V =250 V, armature resistance Ra=1 Ω,…
Q: rpm when operating at its rated load. The equivalent circuit has the following per-phase :parameters…
A:
Q: A four pole wave wound armature of a DC machine has 500 conductors and flux per pole of 12 mWb. Find…
A: Dc generator convert mechanical energy in to electrical energy. It works on principle of Faraday's…
Q: (c) A 2400 V, 1000 KVA, 0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected synchronous…
A: Given: A 2400 V, 1000 kVA, 0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected synchronous…
Q: Discuss about generator modeling and drive the formula for the real and reactive power supply it .
A: Generator modeling - The simplest sophisticated modeling in a system stability tool are generator…
10. A short shunt compound dc generator supplies 7.5 kW at 230 V. the shunt field, series field and armature resistance are 100, 0.3 and 0.4 ohms respectively. Calculate the induced emf.
a. 253.8 V
b. 255.7 V
c. 259.6 V
d. 257.1 V
Step by step
Solved in 2 steps
- Consider a 3-phase delta induction motor that is operating at 120 Hz. The motor (load) impedance, Z_Δ is given as (9+j12)Ω. The line-to-line voltage at the load is, ?_ab=416 ∠30ºVrms. Let the source be wye-connected, and line impedance be negligible. a) Draw the single-phase wye equivalent circuit and label all known parameters numericallyincluding load voltage. b)Determine the rms phase current phasors for each phase. c) Calculate the complex power consumed by the 3-phase load. d) Determine the capacitance value of each capacitor in a 3-phase delta capacitor bank needed to correct the load to a power-factor of 0.9, lagging.Consider a 3-phase delta induction motor that is operating at 120 Hz. The motor (load) impedance, Z_Δ is given as (9+j12)Ω. The line-to-line voltage at the load is, ?_ab=416 ∠30ºVrms. Let the source be wye-connected, and line impedance be negligible. b)Determine the rms phase current phasors for each phase. c) Calculate the complex power consumed by the 3-phase load. d) Determine the capacitance value of each capacitor in a 3-phase delta capacitor bank needed to correct the load to a power-factor of 0.9, lagging.A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power. Find the load angle?
- An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor lagging. (a) Compute the required kVA rating of a shunt capacitor to improve the power factor to 0.9 lagging. (b) Calculate the resulting power factor if a synchronous motor rated at 375 kW with 90% efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage.A single-phase alternator connected to 6,600-V bus-bars has a synchronous impedance of 10Ω and a resistance of 1 Ω. If its excitation is such that on open circuit the p.d. would be 5000 V, calculate the maximum load the machine can supply to the external circuit before dropping out of step and the corresponding armature current and p.f. [2864 kW, 787 A, 0.551]Incremental fuel cost of a generator is given as 3 P12+ 40 P1 +90 $/MWh. Give the cost function and Calculate the operating cost of the generator for meeting 100 MW, if the fixed cost is 20$/h?
- Electromechanical energy conversion (One AC induction motor and one AC synchronous motor were operated connected to an infinite bus of 600V. Power factor of the induction motor is 0,7 (lagging) and consumes 400 W from the bus. Synchronous motor consumes 300 W from the bus. If the power factor of the synchronous motor is 0,9 (lagging) find the line current from the bus, for the total of two motors (IL total 1) of the line that connects the motors with the bus and find the total appearent power (SL total 1) of the motors consumed from the bus. When the induction motor has the same conditions, if the power factor of the synchronous motor is 0,9 (leading) find the line current from the bus, for the total of two motors (IL total 2) of the line that connects the motors with the bus and find the total appearent power (SL total 2) of the motors consumed from the bus.If the Reactance of the cylindrical rotor machine connected to an infinite bus bar is double that of the external reactance of 0.5.p.u. If the power angle is 35°, real power output is 0.8, compute the excitation voltage, and for the same power output, if the load angle is reduced by 10 degrees, find the external reactance to achieve this.National Power Corporation has A 3-phase, Wye -connected turbo-alternator, having a synchronous reactance of 10 Ω per phase and negligible armature resistance, has an armature current of 220 A at unity p.f. The supply voltage is constant at 11 kV at constant frequency. If the steam admission is unchanged and the e.m.f. raised by 25%, determine the current and power factor. [288.6 A , 0.762 (lag)]
- 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.*need in 20 mins please :((* A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 Ω, 125 Ω, and 0.321 Ω respectively. If it supplies a load of 8 kW at a terminal voltage of 233 V, calculate the generated emf in volt.Consider an ac network with an ideal transformer (with turns ratio of n:1) shown below where ZL=(1+j0) is the load impedance and Zs=(7−j24). Ideal transformer turns ratio n is chosen so that the average power delivered to the load is maximized. Under this scenario, the average power delivered to the load is given by