1.The equivalent parameters of a 150kVA, 2400V/240V transformer, are R1=0.2Ω, R2=2mΩ, X1=0.45Ω, X2=4.5mΩ, Rc=10kΩ, and Xm=1.55kΩ. The transformer is operating at rated load and rated voltage with 0.8 lagging power factor. Using the approximate equivalent circuit referred to the primary side, determine: (i) (i) the voltage regulation (ii) (ii) the transformer power loss and efficiency
1.The equivalent parameters of a 150kVA, 2400V/240V transformer, are R1=0.2Ω,
R2=2mΩ, X1=0.45Ω, X2=4.5mΩ, Rc=10kΩ, and Xm=1.55kΩ. The transformer is
operating at rated load and rated voltage with 0.8 lagging power factor. Using the
approximate equivalent circuit referred to the primary side, determine:
(i) (i) the voltage regulation
(ii) (ii) the transformer power loss and efficiency
2.Nanoscale drives occur in the living world for example in the bacterial
flagellum or ATP synthase. For one of these drives describe with the aid of
diagrams how it operates and discuss the features which the drive has in
common with large scale, man-made counterparts.
3.A 15 kW, 250V shunt motor with Ra=0.22 Ω, Rf=170 Ω. At no-load and
rated voltage, the speed is 1200 rpm and the armature current is 3 A. At full-
load and rated voltage, the line current is 55A. What is the full-load speed?
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Is there a clearer answer to the first question? The answers shown above are confused。
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