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A 20 kVA, 2000/200 V, 50 Hz transformer is operated at no-load on rated voltage, the input being 150 W at 0.12 power factor. When it is operating at rated load, the voltage drops in the total leakage reactance and the total resistance are, respectively, 2 and 1 per cent of the rated voltage. Determine the input power and power factor when the transformer delivers 10 kW at 200 V at 0.8 pf lagging to a load on the LV side.
If there are 16 shades of gray per pixel, 500 pixels per line, 525 lines per frame, and 30 frames per second in a TV set, calculate the maximum number of pixels per frame and calculate the maximum information rate in Mbits per second in the TV dis..
The power supplied by a certain battery is a constant 6.0 W over the first 5 minutes, zero for the next 2 min, a value that increases linearly from zero to 10 W during the next 10 minutes, and a power that decreases linearly from 10W to zero in th..
A temperature sensor has a static transfer function of 0.15mV/C and a time constant of 3.3s. If a step change of 22 degrees to 50 degrees C is applied at t=0, find the output voltages at .5s, 2.0s, 3.3s, and 9s. What is the indicated temperature a..
The process of stereophonic broadcasting was illustrated in Chapter 3. By comparing the noise power in the l(t)-r(t) channel to the noise power in the l(t)+ r(t) channel, explain why stereophonic broadcasting is more sensitive to noise than nonste..
What Role Power factor play in AC circuits and power dissipation ? and What are the Disadvantages of Low Power Factor ??
(a) Show the truth table of a 3-input-8-output binary decoder (without enable logic). (b) Construct a 3-input-8-output binary decoder using NOT, AND and OR gates (without enable logic).
Given a co-axial cable to which Pinner = a and Pouter = b energized +Q, -Q where -+Q is the inner cable charge. a) Find E' for a
A 12.5 nF capacitor is fully charged by a 12 V source. a) What is the charge on the capacitor b) What is the energy stored in the capacitor. Now the charged capacitor is disconnected from the source and a dielectric, porcelain, is placted between the..
Overlapping sequences should also be detected (ie 00->11->00->11->00 should output 0 0 0 1 0 1). Use a Moore model, and show all of your work including the state machine, state table, state assignment, state assignment table, and the final circuit..
Suppose a dc source has a potential difference of 6.00 V and the current is 0.100 A. Determine the amount of energy provided to the circuit in 1.00 s. How much energy is transferred to the load in 1.00 hour?
A dc separately excited generator runs at 1200 rpm. the rated current and voltages are 100 A at 240 V. The armature resistance is 0.15 (ohms). The open circuit magnetization characteristics at 1200 rpm are
why is it necessary that an ammeter be a low resistance instrument Why must a voltmeter be a high resistance instrument
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