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Q. A single-phase, 3-kVA, 220:110-V, 60-Hz transformer has a high-voltage winding resistance of 0.3 , a low-voltage winding resistance of 0.06 , a leakage reactance of 0.8 on its high voltage side, and a leakage reactance of 0.2 on its low-voltage side. The core loss at rated voltage is 45 W, and the copper loss at rated load is 100W. Neglect the exciting current of the transformer. Find the per-unit voltage regulation when the transformer is supplying full load at 110 V and 0.9 lagging power factor.
Explain Hall effect. Consider a slab of material wherein there is a current density J resulting by an applied electric field Ex in the x- direction. The electrons will drift al
Q. Give the classification of oscillators. Discuss the frequency stability of oscillators. Oscillators are classified in the following different ways. 1. According to the wa
You have a motor that is powered by 24 VDC. It free-runs at 600 radians/second, and stalls with a load of 125 in-lbs. The time constant (τ) of the motor itself is 1.5 seconds. T
Digital Systems 1. Describe the working of Binary comparator (Magnitude comparator) a. Define Binary comparator b. Binary comparator working process with logical diagrams 2.
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Measures for Improving Joints and Connection 1. Spacing of poles: The spacing between poles (for overhead lines) is also an important requirement. Long spans will result in
Q. Consider a 240-V supply feeding a resistive load of 10 kW through wires having a total resistance of R = 0.02 . For the same load, let a 120-V supply be used with a total wire
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