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1) A transformer on no load takes 4.5 A at a power factor of 0.25 lagging when connected to a 120V, 60Hz supply, the number of turns of the primary winding is 250. Calculate the magnetizing current, core losses and the maximum value of flux in the core
2) A step down ideal transformer is carrying 4A of no load current at 0.4 power factor lagging when it is connected to a 600V, 60Hz supply. It is delivering full load current of 100A at 0.85 power factor lagging when it is connected to a 120V load. Find the current flowing in primary winding at this load also draw the vector diagram.
The circuit generates an output of 1 (0) when the third bit is received if the 3 bits have even (odd) parity; the circuit output is a don't-care for the first 2 bits. Construct an incompletely specified table for the circuit.
Concider an ac circuit source with an rms amplitude Irms connected to a parallel RLC circuit with resistance R, inductance L, and capacitance C. Derive an expression for the time-average power dissipated by the circuit
A pulse is used to measure the frequency response of a system. Since we expect the frequency response to extend to 20 kHz, select a pulse whose magnitude spectrum is constant within 1% out to 20 kHz.
What observations can be made about a physical system that has both pole and zero locations that are not real-valued or complex conjugate pairs.
find the complete functions, p(t) and w(t) supplied by the element, not just a number, and graph p(t) and w(t). Choose appropriate intervals of time for your graphs. Assume that both v(t) and i(t) are zero for t
Consider the stable system represented by the differential equation: dx(t)/dt + 3x(t) = u(t) Determine the phase lag for this system if the input u(t) = sin3t.
Two equal resistors R connected in series across a voltage source V dissipate power P. What would be the power dissipated in the same resistors when they are connected in parallel across the same voltage source
Determine the relative permittivity of the dielectric, the maximum and minimum electric field intensities in medium 1 and the electric field intensity in medium 2.
Suppose 33 mL of 1.20 MHCl is added to 42 mL of a solution containing excess sodium hydroxide, NaOH, in a coffee-cup calorimeter. The solution temperature, originally 25.0C, rises to 31.8C.
What are two of the major considerations that factor in the design of a substation. Give a couple of examples of station layouts where these factors are clearly demonstrated. What typical grounding materials are used in substations.
The capacitor has to have the following specifications: Needs to provide 100 horsepower for 10 hours Max operation voltage of 480V The min and max for the dielectric and metals are: 10 nm
Some research data is provided to you for the purpose of learning to use Matlab features of polynomials and curve fitting, file name: mydata You may load the data to your computer by typing mydata =load(‘path of the mydata').
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