GATE (TF) Textile 2009 Question Paper Solution | GATE/2009/TF/35

Question 35 (Textile Engineering & Fibre Science)

A blowroom is having five machines. The total cleaning efficiency for first four machine is 40%. The cleaning efficiency of the last machine is 30%. The overall cleaning efficiency (%) of the blowroom is

(A)	70
(B)	64
(C)	58
(D)	52

[Show Answer]

Option C is correct

Given in the question-

Blowroom has 5 machine-

Let us assume-

Trash % in first machine=X1

Trash % in second machine=X2

Trash % in third machine=X3

Trash % in fourth machine=X4

Trash % in fifth machine=X5

And

Cleaning efficiency of first 4 machine=40%

Cleaning efficiency of last machine=30%

Overall cleaning efficiency(%) of blowroom=?

By formula-

Cleaning efficiency(C.E.%)= $(\frac{Trash in feed-Trash in delivery}{Trash in feed}) \times 100$

Cleaning efficiency of first 4 machine=40%

i.e.,

Cleaning efficiency of first four machine= $(\frac{Trash in first machine-Trash in fourth machine}{Trash in first machine}) \times 100$

Cleaning efficiency of first four machine= $(\frac{X1-X4}{X1}) \times 100$

40= $(\frac{X1-X4}{X1}) \times 100$

0.40= $1-\frac{X4}{X1}$

$\frac{X4}{X1}$ =1-0.40

$\frac{X4}{X1}$ =0.60………………(1)

Similarly cleaning efficiency of last machine=30%

$\frac{X5}{X4}$ =0.70………………..(2)

Multiply both 1 & 2 eq

$\frac{X5}{X1}=0.6 \times 0.7$

$\frac{X5}{X1}=0.42$ ……………………(3)

Now,

Overall cleaning efficiency % = $(\frac{X1-X5}{X1}) \times 100$

Overall cleaning efficiency % = $(1-\frac{X5}{X1}) \times 100$

By putting value from equation no. 3

Overall cleaning efficiency % = $(1-0.42)\times 100$

Overall cleaning efficiency % = $0.58 \times 100$

Overall cleaning efficiency % = 58 (Ans)

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Frequently Asked Questions | FAQs

What is the overall cleaning efficiency of blow room?

The overall cleaning efficiency of the blow room in the textile industry refers to the effectiveness of the blow room machines in removing impurities, such as dust, dirt, foreign fibers, and trash, from the raw material (such as cotton, wool, or synthetic fibers) during the initial stages of yarn production. The cleaning efficiency is typically expressed as a percentage and indicates the proportion of impurities removed by the blow room process.

The overall cleaning efficiency of the blow room depends on various factors, including the specific machines used, their settings, the quality of the raw material, and the desired yarn quality. Achieving high cleaning efficiency is essential to ensure the production of clean and high-quality yarns.

The blow room process typically involves several machines that work together to open, clean, and blend the fibers. These machines include bale openers, pre-cleaners, mixers, and various types of cleaning and opening machines. Each machine has a specific function in removing impurities and preparing the fibers for further processing.

The cleaning efficiency of each machine in the blow room can vary, and the overall cleaning efficiency is the cumulative result of the performance of all the machines in the blow room line. The machines are designed to remove different types and sizes of impurities through processes such as opening, beating, aspiration, and mechanical separation.

The overall cleaning efficiency can be influenced by various factors, including:

Machine settings: Proper adjustment of machine parameters such as cylinder speed, fan speed, and grid settings can optimize the cleaning efficiency.

Machine maintenance: Regular maintenance and cleaning of the blow room machines are necessary to ensure their optimal performance and maximum cleaning efficiency.

Raw material quality: The cleanliness and quality of the raw material, such as the presence of trash, dust, or foreign fibers, can impact the cleaning efficiency. Proper handling and storage of the raw material before processing are crucial.

Fiber characteristics: The characteristics of the fibers, such as length, fineness, and the presence of impurities, can affect the cleaning efficiency. Different fiber types may require adjustments in machine settings to optimize cleaning.

The overall cleaning efficiency of the blow room is typically measured by taking samples of the raw material before and after the blow room process and analyzing them for impurity content. The impurities removed are weighed, and the cleaning efficiency is calculated as the percentage of impurities removed compared to the initial impurity content.
The cleaning efficiency of the blow room can vary depending on the specific setup and conditions, but it is generally expected to be in the range of 90% or higher. However, achieving complete removal of all impurities is challenging, and residual impurities may still be present in the processed material. Therefore, subsequent processes like carding and combing are employed to further enhance yarn cleanliness and quality.

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