A speed-ratio of 4:1 is used in a drive with a 1800 rpm motor. What is the output shaft speed?

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Study for the PMMI Mechanical Drives Test with engaging multiple choice questions and detailed explanations. Enhance your knowledge on mechanical drives and get ready for your exam!

Multiple Choice

A speed-ratio of 4:1 is used in a drive with a 1800 rpm motor. What is the output shaft speed?

Explanation:
A speed ratio of 4:1 means four input revolutions produce one output revolution, so the output speed is the input speed divided by 4. With an 1800 rpm motor, the output shaft speed is 1800 ÷ 4 = 450 rpm. Thus the drive reduces speed to 450 rpm, while roughly quadrupling torque (ignoring losses). If you see other options, those would correspond to different reductions (for example, a 2:1 reduction would give 900 rpm, a 5:1 reduction would give 360 rpm).

A speed ratio of 4:1 means four input revolutions produce one output revolution, so the output speed is the input speed divided by 4. With an 1800 rpm motor, the output shaft speed is 1800 ÷ 4 = 450 rpm. Thus the drive reduces speed to 450 rpm, while roughly quadrupling torque (ignoring losses). If you see other options, those would correspond to different reductions (for example, a 2:1 reduction would give 900 rpm, a 5:1 reduction would give 360 rpm).

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