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Q. A 75-kVA transformer has an iron loss of 1 kW and a full-load copper loss of 1 kW. If the transformer operates on the following load cycle, determine the all-day efficiency:
8 hours full load at unity power factor
8 hours no load
8 hours one-half full load at unity power factor
Explain Stator of a Synchronous Machine? The stator of a synchronous machine is made of thin laminations of highly permeable (silicon) steel in order to reduce the core losses.
GIS APPLICATION IN THE POWER DISTRIBUTION ENVIRONMENT Previously, we have discussed the IT applications in the areas of Metering, Data Acquisition and Management, Asset Manage
Q. Consider an infinitely long, straight wire (in free space) situated along the z-axis and carrying current of I A in the positive z-direction. Obtain an expression for ¯B everywh
Metering and Billing System Previously, you have learnt about various measures for reducing commercial losses of a utility. You have studied in which the metering and billing
Q. With suitable examples differentiate between limiting and known errors. Sol. Limiting Errors (Guarantee Errors): The accuracy and precision of an instrument depends upon
why voltages are in multiple in 11
Q. Two 1150:115-V transformers are to be inter connected for (a) 2300:230-V operation, and (b) 1150:230-V operation. Show the interconnections and appropriate polarity markings.
i need to submit a still model or a working model on science day(28 February). can you help me....
1. Determine the capacitance length of a PCB embedded stripline, assuming no fringing of the electrostatic field. 2. Determine the capacitance/unit length of the same embedded stri
Q. Consider a pair of coupled coils as shown in Figure of the text, with currents, voltages, and polarity dots as indicated. Show that the mutual inductance is L 12 = L 21 = M by
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