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A transformer has a primary windings of 800 turns and a secondary windings of 200 turns. When the load current on secondary is 80 A at 0.8 p.f, lagging, the primary current is 25 A at 0.707 p.f. lagging. Determine graphically or otherwise, the no-load current of the transformer and its phase with respect to the voltage.
a low pass first order instrument has a time constant of 20ms. Find frequency in hz of the input at which the output is 93% of dc output. Find phase angle.
A certain mixer is producing the following frequencies: 900 kHz, 700 kHz, 500 kHz, and 200 kHz. What are the two most likely input frequencies?
Calculate the electrostatic energy that is stored in the structure if the intermediate space is filled with a dielectric whose relative dielectric constant is 10 and a voltage is applied between the conductors creating an electric field.
determine the current through the capacitor, i_c(t) for time t greater than or equal to zero if the following statements apply. 1. Vc(t=0) = 5V 2. The switch is closed from t = - infinity to t = 0.2 seconds, when it opens.
A constant current I is flowing in a semi infinite loop. Find magnetic field intensity at the origin: H(0,0,0). Use magnetic field intenisty for a piece of wire.
A 20kW, 250V, self-excited dc shunt generator is driven at its rated speed of 1200rpm and it is delivering rated power at rated terminal voltage. Its armature-circuit resistance is 0.15-ohm, and the field current is 2 A.
A series RC circuit is powered by a voltage supply of 120Vac and60Hz. The resistor has a resistance of 80W and capacitive reactanceis 60W. (1) Sketch a schematic for this circuit (2) Determine the capacitance of the capacitor
The problem is a series circuit with the AC voltage of 50V at a phase angle of 0 degrees. Also the resistor has a resistance of 3 ohms. Xc = 5 ohms, X(L) = 9 ohms. All three components are in series. The frequency is 60 Hz.
calculate the mmf when the machine operates at rated voltage at full load? PLease explain how to get the solution to this problem?
signal s(t)= (2a) / (t2+a2) A) Determine the essential bandwidth B Hz of s(t) such that the energy contained in the spectral components of s(t) of frequency below B Hz is 99% of the signal energy.
determine the current drawn from a 3 phase 220 V line by a 3 phase 15kW motor operating at half load, 85% efficiency and .8 pf lagging. Find the values of real and reactive power drawn from the line.
Design a circuit with minimum number of gates for a binary multiplier that multiplies two unsigned four-bit numbers, Using Inverters, AND, OR gates and Full Adders.
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