A power station of 4 MW has an overall efficiency of 0.35 and a fuel calorific value of 7500 k.calorific /kg. If the loaf factor and plant capacity factor of the station is 0.8 and 0.7 respectively. The fuel cosumprtion .in kg for one hour at maximum load
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- A 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.)A generating station is to supply four regions of load whose peak loads are10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Then the installed capacity is (25 to26)MW. O (24 to25)MW. O (23 to24)MW. OWhat is the purpose of power factor correction to a given load? O To reduce the amount of voltage to the load. O To reduce the amount of dependence on automated machinery. O To reduce the amount of current to the load. O To reduce the amount of resistance of the load.
- Draw the circuit diagram of Two quadrant chopper which is having average load voltage might be positive or negative. Explain each quadrant operation with neat sketch. I want more than 350 words and I do not want it in handwritingTable Q2a Time (hours) 0-6 6-12 12-14 14-18 18-24 Load (MW) 45 90 135 150 75 Referring to the Table Q2a; i) Draw the load curve and the load duration curve [Use the graph paper provided] ii) Indicate the base load and the peak load on the graph. Determine the values for both loads. iii) Choose the suitable generating units to supply the load and list their operating schedules. Later, compute the total installed capacity. iv) Calculate the load factor and the plant capacity factor. Discuss the impact on the operating schedule if the plant capacity factor increases to 0.9.Q4. The source current in the circuit shown is in Figure 3a) What impedance should be connected across terminals a,b for maximum average powertransfer?b) What is the average power transferred to the impedance in (a)?c) Assume that the load is restricted to pure resistance. What size resistor connected across a,bwill result in the maximum average power transferred?d) What is the average power transferred to the resistor in (c)?v
- A generating station has a maximum capacity of 100 kW and costs $300,000. The annual fixed charges are 12% of the cost of the generating station consisting of 5% interest, 5% depreciation and 2% taxes. Find the fixed charges per kWh generated if load factor is (a) 100% and (b) 25%.What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.The section bus-bars A and B are linked by a bus-bar reactor rated at 6000 kVA with 12% reactance. On bus-bar-A, there are two generators each of 10 MVA with 8% reactance and on bus-bar-B, two generators each of 6000 kVA with 10% reactance. Find the steady MVA fed into a dead short circuit all phases on B with bus-bar reactor in the circuit.
- State Kirchhoff’s Current Law.A generator operating at 50 Hz delivers 1 p.u. power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 p.u. Where as before the fault, this power was 2.5 p.u. and after the clearance of the fault, it is 2 p.u. The value of 8 is maxQ20. The section bus-bars A and B as shown in Figure B5 are linked by a bus-bar reactors each rated at 5000 kVA with 10% reactance. On bus-bar A, there are two generators each of 10,000 kVA with 10% reactance and on B two generators each of 8000 kVA with 12 % reactance. Find the Current and MVA that fed into a dead short circuit between all phases on B with bus-bar reactor in the circuit. Page 4 of 5 جامعة التقنية والعلومر التطبيقية بإبراء University of Technology and Applied Sciences - Ibra Student ID: Section: Student Name: 8,000 kVA 12% 10,000 kVA 10,000 kVA 10% 8,000 kVA 12% 10% 2 3 5,000 kVA 10% lell 8,000 kVA 10% Figure B5 "End of Question Paper"