Nature of efficiency curve of DC machine is _________________(a) First decreases then increases(b) First constant then decreases(c) First constant then increases(d) First increases then decreasesI got this question in an interview for internship.My question is from Efficiency of DC Machine- 2 in section Efficiency and Testing of DC Machines

Nature of efficiency curve of DC machine is _________________(a) First

1.	Nature of efficiency curve of DC machine is _________________(a) First decreases then increases(b) First constant then decreases(c) First constant then increases(d) First increases then decreasesI got this question in an interview for internship.My question is from Efficiency of DC Machine- 2 in section Efficiency and Testing of DC Machines
Answer» Correct option is (d) First increases then decreases The explanation: The efficiency of a DC machine is different at different values of POWER output. As the output increases, the efficiency increases till it REACHES to a maximum value. As the output is further increased, the efficiency starts decreasing SLOWLY.

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