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1. |
An inductive pick-up used to measure the speed of a shaft has 120-tooth wheel. If the number of pulse produced in a second is 3000, the r.p.m. of the shaft is |
A. | 1200 |
B. | 1500 |
C. | 1800 |
D. | 3600 |
Answer» C. 1800 | |