Question

question 2 (1 point) a lathe motor is rated at 1/2 hp. it is found that it delivers 1/5 hp to the rotating shaft when it operation. what is the efficiency of the lathe? round to the nearest hundredth of a percent. your answer: answer units

Explanation:

Step1: Recall efficiency formula

Efficiency $\eta=\frac{\text{Output Power}}{\text{Input Power}}\times100\%$

Step2: Identify input and output power

The input power of the lathe motor is $P_{in}=\frac{1}{2}$ hp and the output power to the rotating shaft is $P_{out}=\frac{1}{5}$ hp.

Step3: Calculate efficiency

$\eta=\frac{\frac{1}{5}}{\frac{1}{2}}\times 100\%=\frac{1}{5}\times\frac{2}{1}\times100\% = 40.00\%$

Answer:

40.00%