Answer Posted / ankurjha

Circuit Breaker:
Device to control current drawn by the load. Has the
facility of cutting the supply in case of heavy inrush of
current/ short circuit etc..

Contactors:
device to make/ break contacts as & when required. Have
control coil which is energized/de-energized as per the
control requirement.

Isolators:
Usually meant to isolate the circuit manually, so that the
circuit can be worked upon. Have fuses for potection of
load.

Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?

944

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what should be correct gas pressures to be a 1.5 ac unite

1077

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what is the effect of power factor of machines in starting current

1524

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What is FTA card? How it works?

1738

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what is the function of anti pumping relays? what is KVAR? How it is generated in alternator? What is 3rd Harmonics? What is IDMT relay?

1856

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What is a advantage of Self Reset Lockout ? On Fault breaker get trip & fault no longer exist then self reset lockout how inform us?

1379

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what happen ehen synchronisation is done at below rated speed

1613

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What is negative sequence over voltage element?

1429

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Explain about technical and non technical losses in distribution system?

627

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what are the components in electrical control panel (for example: 415V, 3-ph, panel to operate utility and 3-ph DG set).

1563

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I AM FROM ELECTRICAL ENGINEERING ? I AM ASPIRING FOR "BHEL".HOW I HAVE TO PREPARE .ON WHICH TOPICS TO BE CONCENTRATE MORE.PLEASE GIVE FULL DETAILS OF WRITTEN EXAM.

1657

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what is the standard values(Megger test) of resistances between L&N,L&E and N&E for a system on IEE regulations?

1661

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can i connect the two phases of scott connected transformer,if not why?

1513

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at which voltage level arcing ground is occurs ??????????

1583

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explain all the classes with example

1501

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