Basic Viva For Textile Engineers (Fabric Related) Part-7

 

181. How many sets of yarn are used in weaving?

Ans. Two sets (warp and weft).

182. Is sizing required in knitted fabric?

Ans. No.

183. Write down the types/ classification of knitting.

Ans. Two types,

Warp knitting &

Weft knitting.

184. Is yarn preparation is needed in knitting?

Ans. No.

185. Is knitting fabric produce by inter looping?

Ans. Yes.

186. Is weaving fabric produce by interlacing?

Ans. Yes.

187. In which knitting, a fabric is produce by single yarn?

Ans. Weft knitting.

188. What is the other name of warp yarn?

Ans. Ends

189. Write down the loom driving system?

Ans.

Hand driving (hand loom) &

Electric motor driving (power loom)

190. Write down/ what are the different types of shed?

Ans.

Bottom close shed

Center close shed

Semi-open shed

Open shed

191. What is shedding?

Ans. Shedding is the act of dividing the warp threads according to design into two parts, to allow the passage of shuttle/weft inserting element from one side of the loom to the other.

192. Write down/what are the types of shedding mechanism?

Ans.

Paddle/treadle shedding (used in hand loom)

Tappet shedding (used in power loom)

Dobby shedding (used in power loom, at past used in hand loom)

Jacquard shedding (both hand & power loom are used now)

Combined shedding

193. Normally tapped shedding mechanism produces square design (e.g. 4x4, 6x6, 7x7, etc.) (Yes /no)

Ans. Yes.

194. We can produce basic weave structures (i.e plain, twills satin) in tapped shedding (yes/no)

Ans. Yes

195. Where open shed is used?

Ans. Tapped loom

196. What is fabric?

Ans: Interlacement of two or more thread of yarn.

197. What are the primary motion?

Ans. The primary motion are as follows-

Shedding

Picking

Beating

198. What are the secondary motion?

Ans. The secondary motion are as follows :

Let off

Take-up

199. What are the tertiary motion?

Ans. The tertiary motion are as follows-

Warp stop motion

Weft stop motion

Warp protector

Weft protector

200. Where bottom & center close shed are used?

Ans. Hand jacquard looms to produce delicate fabrics.

201. Where semi-open shed is used?

Ans. Double lift dobby & Jacquard.

202. One shedding + one picking + one beating =?

Ans. One weaving cycle/ loom cycle/picks cycle

203. One picking tapped insert one pick(True or False)?

Ans. True

204. What is the result of unequal shedding?

Ans. Wrong design & stitching

205. What are the maximum numbers of heald frame controlling capacity in tapped shedding mechanism?

Ans. 14

206. Dobby shedding mechanism can produce both square and rectangular size design (yes/no)

Ans. Yes

207. What types of design can be produced by Jacquard looms?

Ans. Any design

208. What are the maximum numbers of warp threads controlling capacity in Jacquard loom?

Ans. 1800

209. What is sizing?

Ans. Sizing is the process of giving a protective coating on the warp yarn to minimize yarn breakage during weaving.

210. What materials form the base of the size?

Ans. Starch or gum