A capacitor (condenser) is used in an electrical circuit to (A) Step down voltage (B) Step up voltage (C) Store electric charge (D) Produce electric charge
3 7641why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer.
12 66416i want the previous question paper for rrb section engineer exams. and also syllabus for this examination.
2 10571I want formula to calculate cable size as per load given in kw & amp.I searched many sites but didn't right answer.Plz reply me asap.
41 407028In india the power supply is always in multiple of 11, eg.220 V, 440 V... what is the reason?
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A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
