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In a manual shunt motor starter relay positions are ________________________

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In a manual shunt motor starter relay positions are ________________________

(a) Over load relay is connected in series and no volt relay in parallel with the load

(b) Over load relay is connected in parallel and no volt relay in series with the load

(c) Over load relay and no volt relay are both connected in series with the load

(d) Over load relay and no volt relay are both connected in parallel with the load

This question was addressed to me in a job interview.

This interesting question is from Starting of DC Motors topic in chapter DC Motors of DC Machines

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Correct choice is (a) Over load relay is connected in series and no volt relay in parallel with the load

Easiest explanation: In simple manual shunt motor starter like 3-point starter over load relay coil is kept in series with DC mains while no volt coil is kept in parallel with DC mains. Both the coils are equally important in a motor starter circuit.

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