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Why the built in pointer a useful feature of the microscope?

It gives users a better way to identify and point out certain parts of the slide. The feature also highlights special aspects Êor characteristics found among the selection.


What is a device with an electromagnet that continually rotates because of a changing electric current?

The device is known as a "motor".


Does a induction motor need excitation?

The induction motor is the special kind of motor which runs below and above the synchronous speed. which the synchronous motor runs nearly equal the synchronous speed. The operation of synchronous motor runs with dc field excited hence separate dc field current is given to the field circuit. where as the induction motor the field and main field is drawn from the same supply hence no excitation is required. But due to this separate starting mechanism has to be required in case of the single phase induction motor.


What is the current HTML standard and how does it differ from the previous standard?

The current HTML version is the version 5. It has a special feature of HTML Authentication which was not in the before versions.


How do you identify terminals in three phase motor with two speed in cone type motor with brake system?

I usually look at the data plate on the side of the motor, or inside the terminal junction cover. If neither are there, a motor rewinding shop could open it up and tell. Different manufacturers are known to use their own color codes. Esp. if it's a foreign make.