Why alternator is operated at lagging power factor?
How alternator responses with changing the load?
Latest Answer: Since the Synchronous generator having the property of supplying the reactive power along with the real power, this can be operated in lagging power factor only. Suppose if it want to work with leading power factor means, it should absorbed reactive power ...
Why most of the alternator is connected in star and have high regulation around 30% as compared to transformer?
Latest Answer: In my opinion the generators are connected in star to detect the e/f. Otherwise how E/F protection will operate? ...
Which Circuit Breaker is better either Air CB or Vacuum CB? Why?
Latest Answer: The vacuum C.B is better than A.B C.B for medium voltage because of its better operation and longer life. But in high voltages we cant use the vacuum C.B. ...
We have enough category of AC machines more relliable than DC machine then why we are using DC machines in some application yet?
Latest Answer: Each AC and DC machine having its own characteristics.According to the reguirement, the motors will be selected. Also the availability of supply is taken into consideration. But normally AC is preffered than DC due to its low maintenance and relaiability. ...
How much load is required to convert 100 KW Single Phase load to 3 Phase Load?
Why pressure coil is named so in wattmeter circuit?
Latest Answer: It is connected across the source, it means it is pressurised by the source. ...
What will be the body impedance of human body>What will be the maximum allowable earthing resistance value?
Latest Answer: Human body impedence depends on the nature of the body and it varies appreciably between different sizes. The fatter the lower resistance.The acceptable earth resistance will be less than 1 Ohm - the lesser the better. ...
Why OC test is carried out on low voltage side of transformer?
Latest Answer: To arrange the LV source is easy for OC test. ...
Why do you get a typical sound when the transformer is put into operation?
Latest Answer: Transformer noise is caused by the phenomenon magnetostriction. When a piece of any magnetic sheet is placed in the magnetic field it gets magnetised and elongate. But when the magnetic field is removed it is again comes to its original shape and because ...
Why OC test is carried out at rated voltage and frequency?
Latest Answer: To find out the losses under normal operating condition. ...
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