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For which motors DOL starter can be used?

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in DC Machines by (506k points)
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.P

The question was asked during an online interview.

My doubt stems from Starting of DC Motors in chapter DC Motors of DC Machines

1 Answer

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Best 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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