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Which of the following alternatives will be cheaper (1) A 100 h.p AC, 3-phase motor (2) Four motors of 25 h.p each (3) Five motors of 20 h.p each (4) 10 motors of 10 h.p each explain
3040A synchronous machines has higher capacity for (1) Leading power factor (2) Lagging power factor (3) Does not depend upon the power factor of machine (4) None of the above
JSW,
2 16506One 200 V, 100 W bulb is connected in series with primary of a 200 V, 10 kVA transformer. If its secondary is kept open circuited, then the bulb would have (1) Full brightness (2) Poor brightness (3) A little less than full brightness (4) More than full brightness...explain
2 9416The maximum demand of consumer is 2 kW and his daily energy consumption is 20 units. Its Load Factor is (1) 10.15% (2) 41.6 % (3) 50 % (4) 60%
2 23864How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15
3276We have ONLINE UPS 15KvA (3PHASE 440V I/P,3PHASE O/P,440V) I want to step down from 440 to 220 V What to do. Pl. suggest with specification.
ARDE,
1 3257an ac induction motor gets overheated when operated at a low frequency of 25 hz a instead of 50 hz. reason?
1 3856Post New Electrical Engineering Questions
What is an Air COmpressor
we have earthmat at 110KV substation.we would like to take earth resistance.b some says that by connecting earth megger terminals (C1,P1) at middile point of earthmat (at riser) will cause voltage gradient at other earthmat nods and dont get exat earth resistance.when connecting at end nods will get exat value . is it correct .please explain
The screw thread commonly used for transmission of motion is one of the following types of threads
what is relation between ct and pt ratio with multiplication factor of a energy meter? is there any other factor on which multification factor depend?
what is the current setting for different relay protection for transformer .
What is the unit audit? if our Max demand is something and we found much more unit then how to improve our max demand?
why the protection turbo generators is most complex?
How to convert 2 phase to 3 phase electricpower in induction moter?
What is Scheme Test of High Voltage Switchgear. Which tests it includes.
How to operate a ac chilar plant?
why burdens of VTs is more than CTs?
What is the criteria that generally follow by distribution licenses to fix contact demand of their industrial customers?
According to IEC60034-14, When the vibration monitoring system required for motor Bearing. above which KW, it is required? and for what type of bearing the vibration probe is provided.
earth also having a gravitational force (magnetic field of north and south)but it attracts any object compare to this theartifical magnetic cant perform same as earth why?
can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?
