4. What is the value of power system frequency (in Hz) in the US? What are the common residential voltage levels in the US?
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Fundimentals of Energy Systems Q4
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- Q1)Fill in the following blanks : 1. The breakdown voltage of gas or air with increase in pressure under uniform field has relation with pressure ......... 2.The breakdown voltage of a spark gap for impulse voltage Is compared to the breakdown voltage of power frequency ac ........ 3. Among the common gases that are used for electrical insulation which gas has the highest breakdown strength at atmospheric pressure...... 4. Which of the following gas is a electronegative gas .....What 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.plesase solve these all questions with a briefly explanation thank you
- What does matched load mean?What happens if the load is not matched?a) How many MVAr of shunt capacitors are required to increase the power factor on a 10 MVA load from 0.85 to 0.9 lagging? b) How many MVAr of shunt capacitors are required to increase the power factor on a 10 MVA load from 0.90- to 0.95 lagging? c) Which requires more reactive power, improving a low power-factor load (case a) or a high power-factor load (case b)?A generation station of 3 MW supply a two region A & B .The load variation of these regions is as follow: Region A (Time) From midnight from 4a.m to From 10a.m to From 5p.m to to 4a.m 10a.m 5p.m 7p.m From 7p.m to midnight Load(kw) 800 500 NO load 300 100 Region B (Time) From From From From From midnight 6a.m to 2p.m to 4p.m to 9p.m to Load(kw) to 6a.m 300 2p.m 4p.m 9p.m midnight 600 No load 800 1100 With neglect transmission line losses. Find the load factor, diversity factor, reserve capacity,plant use factor.
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- An overhead line having the surge impedance of 400 is connected to a short length of cable of surge impedance of 50 Q. A travelling wave of constant magnitude of 80 kV and infinite duration originates in the overhead line and travels towards the junction with cable. Find the energy transmitted for a duration of 3 usec into the cable after the wave has arrived at junctions. CORRE4. The frequency unit of hertz is equivalent to __________. Select one: a. period b. cycle c. radian/s d. inverse secondDraw the circuit diagram of two quadrant chopper designed by IGBT which has the average voltage always positive. Describe the quadrant operation with neat sketch of current flow direction.