Assertion (A) : Polyester does not require desizing before dyeing.
Reason (R) : Polyester contains natural waxes and pectins.
In the light of the above statements, choose the most appropriate answer from the options given below :
Analyzing Assertion (A): Polyester Desizing
The statement asserts that polyester does not require desizing before dyeing. Polyester is a synthetic fiber. While sizing agents are applied to polyester yarns during weaving to protect them, the specific nature of polyester and the sizing agents used means a separate, intensive desizing step like that for natural fibers (e.g., cotton) might not always be necessary. Often, standard scouring or washing processes can effectively remove residual sizing and impurities, allowing for uniform dye uptake. Therefore, accepting the premise that it doesn't require a distinct desizing step, Assertion (A) is considered correct in this context.
Evaluating Reason (R): Polyester Composition
The reason states that polyester contains natural waxes and pectins. This is incorrect. Polyester is a synthetic polymer derived from petrochemicals. Natural waxes and pectins are characteristic components of natural fibers, such as cotton or flax, not synthetic ones like polyester. Polyester is manufactured and does not possess these natural substances.
Conclusion on Statements
- Assertion (A) is correct: Polyester might not require a distinct desizing step before dyeing, as its pretreatment often integrates with general scouring processes.
- Reason (R) is incorrect: Polyester lacks natural waxes and pectins; these are found in natural fibers.
Since Assertion (A) is correct and Reason (R) is incorrect, the most appropriate choice is the one that reflects this assessment.
Similar Questions
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The yarn strength depends on the level of twist given in the final stage of ring spinning.
Reason (R) : Twist helps in binding the fibres through lateral pressure exerted by outer layers of fibres on the fibres in the core.
In the light of the above statements, choose the most appropriate answer from the options given below : - Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The configuration and orientation of fibres in a yarn decides the uniformity of twisted yarn.
Reason (R) : The proper drafting in different stages of spinning changes the configuration and orientation of fibres.
In the light of the above statements, choose the most appropriate answer from the options given below : - Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The single thread tensile strength tester works on pendulum lever principle.
Reason (R) : The force acting on the specimen is directly proportional to the sine of the angle through which the pendulum is lifted from its vertical rest position.
In the light of the above statements, choose the most appropriate answer from the options given below : - Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Latch needles are self sufficient, no extra element is required for hook closure.
Reason (R) : When the needle moves up and down, the formed loop opens and closes the latch.
In the light of the above statements, choose the most appropriate answer from the options given below : - Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The uneven dyeing leads to the poor appearance in case of cotton fabric.
Reason (R) : The mature cotton fibres poses the problems in uniform dyeing.
In the light of the above statements, choose the most appropriate answer from the options given below : - In the draw texturising machine, the passage of yarn is :
A. primary heater
B. secondary heater
C. winding unit
D. creel
E. friction unit
Choose the correct answer from the options given below : - The sequence of processes involved in the chemical processing is :
A. scouring
B. finishing
C. dyeing
D. desizing
E. bleaching
Choose the correct answer from the options given below : - Melt spinning involves the continuous process for the multi-filament yarn manufacturing follows the sequence as :
A. melting of chips
B. quenching
C. extrusion of melt
D. drying of chips
E. winding on the bobbin
Choose the correct answer from the options given below : - The sequence of warp preparation for weaving is :
A. warping
B. sizing
C. winding
D. drawing and denting in
E. weaving
Choose the correct answer from the options given below : - The major parts of the sizing machine are arranged in the sequence as :
A. drying cylinder
B. beaming unit
C. creel
D. splitting rods
E. size Box
Choose the correct answer from the options given below :
Important Questions from Miscellaneous
- Which of the following scheduler/schedulers is/are also called CPU scheduler ?
(A). Short Term Scheduler
(B). Long Term Scheduler
(C). Medium Term Scheduler
(D). Asymmetric Scheduler
Choose the correct answer from the options given below: - A situation where two or more processes are blocked, waiting for resources held by each other is called:
- External fragmentation occurs ________.
- Which disk scheduling algorithm looks for the track closest to the current head position?
- Which CPU scheduling algorithm prefers the process with the shortest burst time?
