GATE (TF) Textile 2017 Question Paper Solution | GATE/2017/TF/38

Question 38 (Textile Engineering & Fibre Science)

A bobbin lead roving frame is running at 25 m/min delivery speed and 1250 rpm spindle speed. The rotational speed of the bobbin, at the instant of 0.10 m bobbin diameter, accurate to two decimal places, is __1327 to 1331__ rpm.

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Delivery speed(FRD)=25 m/min

Spindle speed=1250 rpm

The rotational speed of bobbin at 0.10 m bobbin diameter=?
Dia of bobbin(D)=0.10 meter

In bobbin lead roving frame-

Bobbin rotational speed-flyer or spindle rotational speed=FRD/\piD

Bobbin rotational speed-1250=25/(3.14*0.10)

Bobbin rotational speed-1250=79.62

Bobbin rotational speed=79.62+1250

Bobbin rotational speed=1329.62 rpm (Answer)

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