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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

1 : 2.5
1 :25
1 : 5
1:50

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Hydraulics & Fluid Mechanics
THE THEORETICAL VALUE OF COEFFICIENT OF CONTRACTION OF A SHARP EDGED ORIFICE IS

0.611
1.01
0.86
0.95

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Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

pitot tube
Venturimeter
rotameter
Orifice plate

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Hydraulics & Fluid Mechanics
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

10 m/sec
25 m/sec
50 m/sec
2 m/sec

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Hydraulics & Fluid Mechanics
Free surface of a liquid tends to contract to the smallest possible area due to force of

viscosity
friction
cohesion
surface tension

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Hydraulics & Fluid Mechanics
The difference of pressure between the inside and outside of a liquid drop is

(a)p = Txr
p = T/2r
(d)p = 2T/r
(b)p = T/r

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