FABRIC MANUIFACTURE - I

(MCQ-1 : MODULE 8 - SHEDDING )

 

Question 1: Cam shedding can control up to

2-4 healds
12 healds
24 healds
36 healds

Question 2: Shedding cams are always mounted on the

Bottom shaft or cam shaft de pending on weave
Crank shaft
Bottom shaft
Tappet shaft

Question 3: The speed of tappet shaft on a loom running at 180 rpm and weaving 2 up 1 down twill would be

90 rpm
180 rpm
60 rpm
120 rpm

Question 4: The speed of a tappet shaft on a loom weaving design on 4 ends and 3 picks will be

Same as that of crank shaft
One fourth of crank shaft
One third that of crank shaft
Three times that of crank shaft

Question 5: During shedding operations, negative cams actually control

Raising and lowering of heald
Raising of the heald
Lowering of the heald
Either raising or lowering of heald

Question 6: For creating the distinct shed in plain weave

The lift (throw) of both the cams should be equal
Lift of the cam controlling the front heald should be higher
Lift of the cam controlling the back heald should be higher
Lift of the cams are irrelevant

Question 7: In 8 up and 1 down twill if the dwell time is 1/4 of a pick then the ratio of duration of longer dwell to that of shorter dwell will be

8:1
4:1
32: 1
29:1

Question 8: In late shedding for plain woven fabric, the duration of shed dwell will be approximately

30-150 degree of crank shaft rotation
120-240 degree of crank shaft rotation
90-210 degree of crank shaft rotation
150-270 degree of crank shaft rotation

Question 9: In spring reversing system, roller with varying diameter is used to

Maintain nearly constant force on the heald frame
To increase the force on the heald frame when it is down
To reduce the force on the heald frame when it is up
To keep the heald in up position for multiple picks

Question 10: A plain woven fabric is being woven with straight draft of four healds and heald staggering. The PPM of loom is 240. If the two cams are separated by 10 degree on the bottom shaft then the difference in the crossing time for the shed lines will be

0.15 second
0.014 second
0.25 second
None of the above.

 

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