Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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WE KNOW THAT THE VOLUME OF A SPHERE IS :

here r = radius of sphere = 2 cm

so

and weight of air is 0.0012929 gram per cubic centimeter

so,

weight of AIR inside the bubble = volume of air bubble x weight of air

weight of air = 33.49 x 0.0012929 = 0.0433035 grams

HENCE THE WEIGHT OF AIR INSIDE A BUBBLE OF 2 cm IS 0.0433035 grams