The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is
A. 3.75 m/min
B. 5 m/min
C. 7.5 m/min
D. 15 m/min
Answer: Option C
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250×30×2= 15000 mm/min
15000÷2
7500mm/min
7.5m/min
Average speed = Distance / Time
= (30*250)/ (1000)
Average speed = (7500)/(1000) = 7.5m/min.
30*250/1000=7.5 m/min
The Correct answer is D 15 m/min. (Reference: S.K. Modal Production Technology notes) but at most places, Ans given is option C.
In simple language:
Average Speed = Total Distance/ Total Time.
Average Speed = (30 * 2 * .250)/1 because Total time is 1 minute.
= 15 m/min.
In this Site Ans 7.5
Soloution On Speed = 0.25 ×30= 7.5m/min
In other site Ans is 15
Here; speed = 2 stoke ie : 30×2=60
So 60×0.25=15m/min
WHAT IS THE CORRECT ANS