8- In a Hopkinson test on two 440V, 200kW generators, the the full-load current, and in addition, 90A are taken from the supply. Find the approximate efficiency of each machine.
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A: The detailed solution is attached with.
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A: Given synchronous generator :80 MVA Xs = j8 Ω. bus voltage :33KV and power factor : 0.9
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A: Given: Line voltage = 2300 V, Terminal voltage per phase Vϕ=23003=1327.9 V, Synchronous reactance…
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A: Given values are - S=1000kVAVt=6.6kVXs=20ohmUnity power factor.cosϕ=1
Q: A. A 20KW, 440V, SHORT SHUNT COMPOUND DC GENERATOR HAS FULL LOAD EFFICIENCY OF 87%. IF THE…
A: NOTE: We’ll answer the first question since the exact one wasn’t specified. Please submit a new…
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A: First we will find total active power from the source. Total reactive power from supply = sum of…
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Q: A 25-kW series generator has an efficiency of 85 per cent when operating at rated load. If the…
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Q: Two separately excited DC generators are connected in parallel to supply a total load current of 100…
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A: As per the policy attempting first three sub questions (a)Load curve are drawn because of the…
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Q: If the no load speed of a motor is 1000 rpm and it decelerates by 30 rpm at full load, find the…
A: NNL=No-load SpeedNFL=Full loadSpeed Regulation =NNL-NFLNFLSpeed Regulation =NNL-NFLNFL*100%
Q: Q3 Show that, if the stator resistance of a three-phase induction motor is negligible, the ratio of…
A: Three-phase induction motor. This is an electromechanical motor and works on the induction…
Q: 2. A synchronous generator is delivering 30 % of the maximum power to an infinite bus. If the…
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Q: Athree-phase, 60-Hz, 500-MVA, 11.8-kV, 4-pole steam turbine-generating unit has an H constant of 6…
A: The given data are:
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A: Question: A 2-pole, 50 Hz, 11 kV synchronous generator with a rating of 120 MW and 0.87 lagging…
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A: Given that it is a three phase induction motor and slip is given so we had to find Positive sequence…
Q: Q.3: Two separately excited DC generators are connected in parallel to supply a total load current…
A: Given For Generator G1 Ra1 =0.2 ohm Induced emf E1 =400 V Constant loss = 5 KW For Generator G2…
Q: 4-A long shunt compound DC generator delivers a load current of 150A at 230V and has armature,…
A: As per our guidelines, we are supposed to answer only one question. Kindly repost the other question…
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A: Solution- From the given graph,tan θ=0.720.7θ=tan-11.028θ=45.81°
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A: In this question we need to find a Induced EMF and load resistance of a short shunt compund genrator
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A: Write down the formula for armature voltage and power angle assume terminal voltage = 1 pu
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Q: A four-pole, 600-V synchronous generator is connected to an infinite bus that supplies a 60-Hz,…
A: Referring to the question, the information are provided as:
Q: Two separately excited DC generators are connected in parallel to supply a total load of 300 A. The…
A: Current shared by generator is such that terminal voltage is same for both generators. power output…
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A: The torque angle of synchronous machine operating from a constant voltage bus, is usually defined as…
Q: Two separately excited DC generators are connected in parallel to supply a total load current of 100…
A:
Q: 6.10 draw a developed diagram covering two poles of a large machine that has interpoles as well as…
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A: the magnetic neutral axis usually shifts in the same direction as of generator and opposite in the…
Q: Given two thermal generating units. For an accuracy of 1.8 MW, and two iterations were performed…
A: First iteration results P1k =180.5 MW P2k =160.5 MW second iteration results P2k+1 =162.8 MW P1k+1…
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Q: A 3 phase, star-connected, cylindrical rotor, 10 MVA, 11kV synchronous generator is supplying rated…
A: Given a synchronous generator with 10 MVA ,11 KV The terminal voltage and real power is constant…
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A: In the DC long shunt compound generator Find the induced power ? Total generated power? Total…
Q: A. What is its synchronous reactance and armature resistance in ohms? B. What is the magnitude of…
A: It is given that: S=100 MVAVL=11.5 KVf=50 HzP=2Xsp.u.=0.8Rap.u.=0.012
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- Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toA single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)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 500 hp with 90 efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage (1hp=0.746kW).
- 8) In single phase system, the performance of motor produces the uniform torque. Select one: True FalseElectromechanical 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.A Turgo type hydro-electric plant uses a 92% efficiency generator to produce its rated output of 32.5 MW. It was observed during its operation that the mechanical loss is 4.25 MW. Also, from the penstock down to the turbine, 14.3% hydraulic head loss and 8.9% leakage loss occurs which are equally distributed and based on the parameters at the dam. The average elevation from the headrace to the jet centerline is 40 m and from the tailrace to the jet centerline is 4.5 m. compute the following: a. Power by the turbine, kW b. Volume flow rate at the source, m3/s c. Power by the jet, kW d. Mechanical Efficiency, %
- MERALCO Electrician has a 25 kW series generator used in street lighting has anefficiency of 85 % when operating at rated load. If the stray power loss is 20 %of the full load loss, calculate the efficiency of the generator when delivering aload of 15 kW, assuming that the stray power loss is substantially constant andthe other losses vary as the square of the load.Suppose a power system consists of two isolated regions: a western region and an eastern region. Five units have been committed to supply 3090 MW as shown below. The two systems are separated by a transmission line that can handle a maximum transfer of 550 MW in either direction. If losses are ignored, calculate the spinning reserve for the overall system and for each region. Comment on the adequacy of the spinning reserve of the overall system, and for each region. (consider the effect on the power supply in each of the regions if the various generators fail). Repeat the above calculations and analysis if an average of 8% of the output of the generators is lost in the transmission and distribution system before reaching the load.A power company is planning to replace a 30-year-old thermal power generator with acapacity of 200 MW with a new generator with a capacity of 1000 MW.a. If the cost was $300 million 30 years ago and is $1000 million today, what is theimplied cost-capacity factor?b. If the cost index 30 years ago was 300, and the cost-capacity factor is 0.8, what is theimplied cost index today.
- A 25-kW series generator has an efficiency of 85 per cent when operating atrated load. If the stray-power loss is 20 per cent of the full load loss, calculatethe efficiency of the generator when it is delivering a load of 15 kW, assuming that the stray-power loss is substantially constant and the other losses vary as the square of the load.A 4400V, 3-ph, Y- connected synchronous motor has an effective resistance and synchronous reactance of 3Ω and 19Ω per phase respectively. If the open–circuit generated emf is 4800V between lines, calculate The current .........amper *P.F at Maximum mechanical powerTotal Cu losses.........watt *Input power to motorAn a electric power system A 200 MW unit with 0.05 pu turbine operates in parallel with a 400 MW unit of identical turbine regulation. For a specified amount of power demand in crease, find the ratio of sharing of the Load by the units, system frequency is 50Hz .