Prandtl number for air is

1.  0.65

2.  0.75

3.  6.5

4.  65

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4
Correct Answer :

0.75


Explanation :
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Higher value of prandtl number shows

1.  Rapid heat transfer by forced convection to mutual convection

2.  Rapid diffusion of momentum by viscous force as compared to diffusion of energy

3.  Both (a) and (b)

4.   None of these

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4
Correct Answer :

Rapid diffusion of momentum by viscous force as compared to diffusion of energy


Explanation :
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Ratio of Reynolds number to prandtl number is known as

1.  Stanton number

2.  Pace lent number

3.  Match number

4.  Biot number

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4
Correct Answer :

Pace lent number


Explanation :
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A charge ‘Q’ is placed at each corner of a cube of side ‘a’ .The potential at the centre of the cube is

1.  8Q/ πε0a

2.    4Q/4 πε0a

3.  4Q/ √3πε0a

4.  4Q/ πε0a

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4
Correct Answer :

4Q/ √3πε0a


Explanation :
No Explanation available for this question

A bob of a simple pendulum of mass 40 gm with a positive charge 4*10-6C is oscillating with time period T1 .An electric field of intensity 3.6 *104N/c is applied vertically upwards now time period  is T2.The value of T2/T1 is (g=10m/s2)

1.  0.16

2.  0.64

3.  1.25

4.  0.8

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4
Correct Answer :

1.25


Explanation :
No Explanation available for this question

The buckling load in a steel column is

1.  Related to the length

2.  Directly proportional to the slenderness ratio

3.  Inversely proportional to the slenderness ratio

4.  Non-linearly to the slenderness ratio

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4
Correct Answer :

Related to the length


Explanation :
No Explanation available for this question

Principal stress at a point in a place stressed element is:σx =σy = 500 kg / cm2. Normal stress on the plane inclined at 450 to x-axis will be

1.  0

2.  500 kg/cm2

3.  707 kg/cm2

4.  1000 kg/cm2

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4
Correct Answer :

500 kg/cm2


Explanation :
No Explanation available for this question

State of stress in plane element is shown in figure Which one of the following figure is the correct sketch of Mohr’s circle of the state of stress

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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If the principal stress corresponding to a two dimensional state of stress are σ1 and σ2 and σ1 is greater than σ2and both are tensile then which one of the following would be the correct criterion for failure by yielding according to the maximum shear stress criterion

1.  (σ1 –σ2) /2 = ± σyp/2

2.  σ1/2 = ± σyp/2

3.  σ2/2 = ± σyp/2

4.  σ1 = ± 2σyp

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4
Correct Answer :

(σ1 –σ2) /2 = ± σyp/2


Explanation :
No Explanation available for this question

Consider the following statements: In a one-dimensional stress system the principal plane is defined as one on which the 1. Shear stress is zero 2. Normal stress is zero 3. Shear stress is maximum 4. Normal stress is maximum Of these statements:

1.  1 and 2 are correct

2.  2 and 3 are correct

3.  1 and 4 are correct

4.  3 and 4 are correct

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4
Correct Answer :

1 and 4 are correct


Explanation :
No Explanation available for this question
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