Textile Engineering > GATE 2017 > Rotor Spinning
A 30 tex open-end rotor yarn having 650 twist per meter is produced using 33 mm rotor diameter and 120,000 rotor rpm. The rotational speed of the peel-off point is $\times 10^{3}$ rpm.
Correct : 121 to 123
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A rotor with 48 mm diameter running at 90,000 rpm is producing yarn at 140 m/min. The number of doublings of fibre layers in the rotor is
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