A 240 V, D.C series motor takes 50 A when giving it's rated output at 1500 rpm. It's total resistance is 0.2 Ω. The value of resistance must be added to obtain rated torque at starting is:

1
1.9 Ω 
2
5.7 Ω 
3
4.6 Ω 
4
2.2 Ω 

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