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A 20 kVA, 4400/220 V transformer with an equivalent impedance of 0.01 Ω is to operate in parallel with a 15 kVA, 4400/220 V transformer with an equivalent impedance of 0.015 Ω. The two transformers are connected in parallel and made to carry a load of 25 kVA. Assume both the impedances to have the same angle.
(a) Find the individual load currents.
(b) What per cent of the rated capacity is used in each transformer?
Assume that a load Z absorbs power of 150 W at a lagging power factor of 0.8, and the voltage across the load Z is 220 Vms, 50 Hz. What must be the value of capacitor that needs to be connected in parallel with the load Z
Find the built-in potential for a p-n Si junction at room temperature if the bulk resistivity - calculate the width of the space charge region for the applied voltages
A separately excited DC motor runs at1500 rpm under no load with 200 V applied to the armature.The field voltage is maintain at its rated value. The speed of the motor, when it delivers a torque of 5 Nm ,is 1400 rpm.
A combinational circuit is defined by the following booleanfunctions. Design a circuit with a decoder and external gates. F1(x,y,z) = x'y'z' + xz F2(x,y,z) = xy'z'+x'y F3(x,y,z) = x'y'z+xz
Consider a source-free parallel RLC circuit having alpha =10^8 s^-1, omega-sub-zero = 10^3 rad/s, and omega-sub-zero * L = 5 ohm. a) Show that the stated units of omega-sub-zero * L are correct. b) Compute s_1and s_2.
Design a Moore machine that has one input X and one output Z. Provide a complete design using D Flip flops. In this design, the output should be 1 any time the sequence 01101 occurs. Overlapping sequences are allowed.
A communication system must transmit the following real valued signal: v(t) = 4cos(2pi*10MHz*t) + 2cos(2pi*20MHz*t)+cos(2pi*30MHz*t)V For this signal, sketch the positive-frequency power specturm P(f>0)
The resistivity of copper is 1.724 micro-ohm-cm at200C. Determine for copper at 200C the resistance (a) of a cylindrical conductor 1 meter long and having a diameter of 1mm; (b) a rod 2 meters long and having a diameter of 2mm.
electronic technology in relationship to the use of personnel and access control, surveillance, and identification of authorized personnel.
A separately excited DC generator,when running at 1200 RPM, supplies 200A at 125V to a circuit ofconstant resistance. What will the current be when the speed is reduced to 1000 RPM if the field current remains unchanged
Determine the minimun number of 20 Acircuits required to supply the general lighting load in a residence of 1750 sq ft. in terms of good design practice, what is the max of receptacles allowed on a dedicated small appliance branch circuit
How many months will it take for Facebook to grow its user base to two billion users?
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