Linked Answer Questions
A precision winder has to wind 4 kg of yarn of 40 tex
Question 81 (Textile Engineering & Fibre Science)
If the efficiency of the machines is 91% additional time (min) required to do the same job is approximately
| (A) | 10 |
| (B) | 12 |
| (C) | 15 |
| (D) | 25 |
[Show Answer]
Option B is correct.
Given in the question-
Winding machine speed=800 m/min
Yarn weight to be wind=4 kg
=4000 gm
Yarn tex=40 tex
Time taken for winding(min)=?
By unitary rule-
1000 m length have=40 gm weight
i.e.
40 gm weight has=1000 meter length
1 gm ………………….=1000/40
Then, 4000 gm has…………=1000 x 4000/40
Total length to be wind=100000 meter
Time taken for winding(min)=Total length to be wind/Winding machine speed
Time taken for winding(min)=100000/800
Time taken for winding(min)=125
This time ,when 100% efficiency is there.
Now, machine gives 91% efficiency.
Winding speed=800 x 91%
Winding speed=800 x 91/100
Winding speed= 728 m/min
Now,
Time taken 2=Winding length/winding speed
Time taken 2=100000/728
Time taken 2=137.4 min
Additional time required to do the same job=Time taken 2 for winding-Time taken for winding
Additional time required to do the same job=137.4-125
Additional time required to do the same job=12.4 min
=12 min (Ans)