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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
1. Name the three parts of a programmable logic controller (PLC) and explain why the PLC is preferred by designers over electromechanical relays. 2. Medium-voltage circuit break
why we plot graph to find bandwidth is drawn b/w av/avmax v/s frequency not av v/s frequency?
Define Johnson Counters to Produce a Time Delay? The "serial in-serial out" shift register can be used as a time delay device. The amount of delay able to be controlled by:
Explain piezoelectricity. Piezoelectricity: It gives us a means of converting electrical energy to mechanical energy and vice versa. While an electric field is applied to
Q. On a per-phase basis, let v = √2 V cos ωt and i = √2 I cos (ωt - θ). (a) Express the instantaneous power s(t) in terms of real power P and reactive power Q. (b) Now consid
LT Metering or Low Tension Metering The subsequent types of meters are generally used for LT consumers: Whole Current Meters i) Single phase meters ii) 3-phase
Explain the NOR GATES - Microprocessor The NOR GATE is an OR gate with the output inverted. Consequently the outputs of a NOR gate would have the opposite states as the outputs o
Q. Explain polyphase induction motor? The polyphase induction motor operates with polyphase alternating current applied to the primary winding, usually located on the stator of
induction motor drives
atomic absorption theory
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