Question 1 : Water is heavier than air under standard conditions by

100 times
500 times
1,000 times
1,500 times

Question 2 : Drag exerted by jet fluid on pick of weft is

Directly proportional to the velocity difference between fluid and weft
Inversely proportional to the Reynolds’s number
Directly proportional to fluid viscosity and yarn diameter
Directly proportional to yarn diameter and Reynolds’s number

Question 3: Match the pairs

A.Isentropic flow	1. Prominent effect of friction
B.Fanno flow	2. No effect of friction
C.Rise in Reynolds’s number	3. Suppression of turbulence at nozzle exit
D.Longer air tube	4. Suppression of effect of friction

(A3, B1, C4, D2)
(A2, B1, C4, D3)
(A4, B2, C1, D3)
(A1, B4, C3, D2)

Question 4 : Profile reed and relay jets in air jet looms

Contribute to raising WIR and reed width for the same air consumption by subjecting the weft to a more vigorous treatment
Contribute to raising WIR and reed width while increasing air consumption but treating the weft more gently
Contribute to raising WIR and reed width while decreasing air consumption and treating the weft more gently

Question 5 : Optimization of air consumption of an air jet loom and improving uniformity of drag on weft can be achieved by

Reducing the number of relay jets controlled by a valve and bringing the relay jets closer to each other
Increasing the number of relay jets controlled by a valve and bringing the relay jets closer to each other
Reducing the number of relay jets controlled by a valve and moving the relay jets away from each other
Increasing the number of relay jets controlled by a valve and moving the relay jets away from each other

Question 6 : Water jet stream emerging from nozzle has a much lower velocity than that of air jet stream because

Water cannot be compressed to the same extent that air can be
The efficiency of water jet nozzle in conversion of potential energy to kinetic energy is lower than that of air jet nozzle
Aerodynamic resistance to water jet stream is higher than that against air jet stream
Kinematic viscosity of water is much higher than that of air

Question 7: Match the pairs

A.Water jet looms	1. Very high WIR and high reed width
B.Rapier looms	2. Specially suited for weaving delicate yarns
C.Air jet looms	3. Only hydrophobic yarns
D.Griper looms	4. Moderately high WIR and highest possible red width

(A3, B2, C1, D4)
(A2, B1, C4, D3)
(A3, B4, C2, D1)
(A1, B4, C3, D2)

 

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