Fluid Mechanics

571.The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

1. 0.5
2. 1
3. 1.5
4. 2

View answer

572.The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is

1. 0.3
2. 0.9
3. 0.03
4. 0.66

View answer

573.The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is

1. 0.5
2. 1
3. 2
4. 0.33

View answer

574.The ratio of wall drag to total drag in the Stoke's law range is

1. 0.5
2. 1
3. 43891
4. 43892

View answer

575.The ratio of width to depth for the most economical rectangular section in open channel flow is

1. 0.5
2. 1
3. 1.5
4. 2

View answer

576.The resistance wire used in a hot wire anemometer for conducting electrical current is made of

1. Copper
2. Tungsten
3. Chromium
4. Aluminium

View answer

577.The Reynolds number for an ideal fluid flow is

1. 4
2. 2100-4000
3. 4000
4. ∞

View answer

578.The schedule number of a pipe is an indication of its

1. Size
2. Roughness
3. Material density
4. Wall thickness

View answer

579.The simple Pitot tube does not measure the

1. Static pressure
2. Dynamic pressure
3. Velocity at the stagnation point
4. All (A), (B) and (C)

View answer

580.The simple Pitot tube measures the _________ pressure.

1. static
2. Dynamic
3. Total
4. None of these

View answer