Prandtl‘s mixing length is turbulent flow signifies

1.  average distance perpendicular to  the mean  flow  covered  by the mixing particles

2.  the ratio of mean free path to characteristic length of the flow field

3.  the  wavelength  corresponding  to  the  lowest  frequency  present  in  the  flow field

4.  the magnitude of turbulent kinetic energy

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Correct Answer :

average distance perpendicular to  the mean  flow  covered  by the mixing particles


Explanation :
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In a composite slab, the temperature at the interface (Tinter) between two materials is equal to the average of the temperatures at the two ends. Assuming steady one-dimensional heat conduction, which of the following statements is true about the respective thermal conductivities

1.  2k1=k2

2.  k1=k2

3.  2k1=3k2

4.  k1=2k2

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Correct Answer :

k1=2k2


Explanation :
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For ,the particular integral is:

1.  1/15 e2x

2.   1/5 e2x

3.  3 e2x

4.  C1e-x+ C2e-x

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Correct Answer :

1/5 e2x


Explanation :
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The solution of the differential equation 

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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In a four-bar linkage, S denotes the shortest link length, L is the longest link length, P and Q are the lengths of other two links. At least one of the three moving links will rotate by 360° if

1.  S+L≤P+Q

2.  S+L>P+Q

3.  S+P ≤ L+Q

4.  S+P>L+Q

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Correct Answer :

S+L>P+Q


Explanation :
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A 60 mm long and 6 mm thick fillet weld carries a steady load of 15 kN along the weld. The shear strength of the weld material is equal to 200 MPa. The factor of safety is

1.  2.4

2.  3.4

3.   4.8

4.  6.8

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Correct Answer :

3.4


Explanation :
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The differential equation governing the vibrating system is

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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The velocity profile in fully developed laminar flow in a pipe of diameter D is given by u = u0 (1 - 4r2/D2), where r is the radial distance from the center. If the viscosity of the fluid is u, the pressure drop across a length L of the pipe is:

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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A pin-ended column of length L, modulus of elasticity E and second moment of the cross-sectional area I is loaded centrically by a compressive load P. the critical buckling load (Pcr) is given by

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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A siphon draws water from a reservoir and discharges it out at atmospheric pressure. Assuming ideal fluid and the reservoir is large, the velocity at point P in the siphon tube is:

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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