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For which motors DOL starter can be used?(a) Up to 5 H.P(b) Up to 10 H.P(c) Up to 15 H.P(d) Up to 20 H.PThe question was asked during an online interview.My doubt stems from Starting of DC Motors in chapter DC Motors of DC Machines

Answer»

Correct choice is (a) Up to 5 H.P

For explanation I would say: DOL starters are limited to the small rating motors where distribution SYSTEM (mains supply) can withstand high starting currents without excessive voltage dips. For a large rating MOTOR, ranging from 5 HP to 25 HP, oil immersed DOL starters are used which provides INSULATION against sparking on contact points, increases the life of STARTER.



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