While carrying out retardation test, if t is equal to time constant then _____________(a) Speed increases to 36.8% of its initial value(b) Speed reduces to 36.8% of its initial value(c) Speed reduces to 26.8% of its initial value(d) Speed reduces to 46.8% of its initial valueI got this question in an online interview.My doubt is from Swinburne’s Test topic in division Efficiency and Testing of DC Machines

While carrying out retardation test, if t is equal to time constant th

1.	While carrying out retardation test, if t is equal to time constant then _____________(a) Speed increases to 36.8% of its initial value(b) Speed reduces to 36.8% of its initial value(c) Speed reduces to 26.8% of its initial value(d) Speed reduces to 46.8% of its initial valueI got this question in an online interview.My doubt is from Swinburne’s Test topic in division Efficiency and Testing of DC Machines
Answer» RIGHT option is (b) Speed REDUCES to 36.8% of its initial VALUE Easy explanation: While carrying out retardation TEST, speed of the motor decreases. At time t equal to time constant then speed reduced is given by 36.8% of its initial value. Retardation test result is used to DETERMINE initial slope of ω(t).

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