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ET 16
ET 16

... 3. A 14.92kW, 440V, three-phase star-connected synchronous motor has an armature of which the effective resistance per phase is 0.4. It is giving its full-load output at a leading power factor of 0.9. If the iron and friction losses amount to 500W, find the armature current. 4. From the output char ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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