Q) The discharge 'Q' in a laminar flow of an incompressible fluid through circular pipe is given by Q = pi/2 * Umax * R ^ 2; then
a) Q is directly proportional to R^2
b) Q is directly proportional to R^4
c) None
Max cutting velocity in shaper. a. End of cutting b. Mid of cutting. c. Start of cutting
Investment casting is used for
- Shapes that are made by difficulty using complex pattern in sand casting
- Mass production
- There is nothing like investment casting
- Shapes which are very complex and intricate and cant be cast by any other method
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Q) A wooden plank (SG 0.5) 1m x 1m x 0.5m floats in water with 1.5kN load on it with 1m x 1m surface horizontal. The depth of the plank lying below water surface shall be ?
a)0.5 m b)0.403 m c)0.250 m d)0.178 m
Which one is not the purpose of heat treatment of steels? 1-changing the composition of steel on the surface.. 2-changing the percentage of carbon and Si in the bulk... 3-incresing or decreasing the grain size..
A zigzag cavity in a block of high strength alloy is to be finished machined. This can be carried out by- 1-edm 2-ecm 3-lbm 4-abrasive flow
Q) The stream function for a two-dimensional flow is given by 'si' = 2xy, calculate the velocity a the point P(2,3). Find the velocity potential function 'phi'
Q) The velocity potential function for a source varies with the distance 'r' as,
a) 1/r b) 1/r^2 c)e^2 d)ln r
In a flow fluid the stream lines and equipotential lines
- Are orthogonal everywhere in the field
- Are parallel
- Cut at any angle
- Cut orthogonal except at the stagnation points
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Streamlines, path line and streak lines are virtually identical for
- Steady flow
- Uniform flow
- Flow of ideal fluids
- Non Uniform flow
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Existence of velocity potential implied that
- Fluid is ideal
- Fluid is continous
- Fluid is irrotational
- Fluid is compressible
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Q) If the stream lines are:
(i)Straight and parallel to each other, there is no acceleration
(ii)Curved and equidistant there will be only normal convective acceleration
(iii)Curved and converging, both normal and tangential convective accelerations
(iv)Diverging, there will be corresponding retardation
a) i, ii, iii b) i, ii c) i, iii d) i, ii ,iii ,iv
Q) the head of water the center of an orifice of diameter 20mm is 1 m. The actual discharge through the orifice is 0.85 liter/s. Find the coefficient of discharge.
a)0.5 b)0.61 c)0.77 d)1
Q) The pitot tube is used to measure
a)Velocity at stagnation point
b)Stagnation pressure
c)Static pressure
d)Dynamic pressure
Q) Bernoulli's equation can be applied between any two points on a stream line for a rotational flow field (True or false ?)
The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as 1.Free vortex 2.Forced vortex 3. Logarithmic spiral
mass moment of inertia of cube with edges of length b,about an axis passing through edge is (take mass of cube as m)
Q) Loss of head due to friction in a pipe of uniform diameter with viscous flow is equal to
a) Re b)1/Re c)4/Re d)16/Re
Q) The loss of head due to sudden expansion of pipe is due to
a)Sudden drop of velocity due to sudden expansion
b)Increase in the pressure due to sudden expansion
c)Turbulence and whirl near the corner of sudden expansion
d)None