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Answer: a
Explanation: The sleeve bearing having a stator outer diameter of 150 mm has losses at
different running speed. The 1000 rpm machine gives loss of 3.7 W.
The provided information seems to be incomplete or unclear to accurately determine the loss in a sleeve bearing with a stator outer diameter of 150 mm under unspecified conditions such as load, speed (indicated as “1000” but units are missing which is crucial, could be RPM but it’s not stated), and lubrication details. Losses in sleeve bearings mainly consist of frictional heat generated between the shaft and the bearing surfaces. This frictional loss can be affected by multiple factors including the material properties, lubrication type and condition, bearing geometry, surface speed, and the applied load.
To calculate the loss, typically one would use the formula for frictional power loss which is a function of the coefficient of friction, the load (force) on the bearing, and the shaft speed. The general formula for power loss due to friction in a bearing is:
[ P = mu cdot F cdot v ]
Where:
– ( P ) is the power loss in watts (W),
– ( mu ) is the coefficient of friction (which varies depending on material and lubrication),
– ( F ) is the load or force on the bearing in newtons (N),
– ( v ) is the linear velocity of the shaft surface relative to the bearing in meters per second (m/s).
Without specific details on the load, the exact operating conditions (like the speed of 1000 is in what unit?), and assuming “1000” is meant to be
a
Explanation: The sleeve bearing having a stator outer diameter of 150 mm has losses at different running speed. The 1000 rpm machine gives loss of 3.7 W.