Irradiation in Heat Transfer is
Anonymous Poll
26%
1 Total amount of heat emitted from a surface.
42%
2 Total amount of heat received by a surface.
23%
3 The total amount of heat reflected by a surface.
9%
4 Non of these.
The answer to the above poll is
2. Irradiation is total amount of heat received by a surface whereas, Radiosity is total amount of heat coming out of a surface.
2. Irradiation is total amount of heat received by a surface whereas, Radiosity is total amount of heat coming out of a surface.
Which of the following will help us to find out local convective heat tranfer coeffecient even if there is no heat transfer taking place?
Anonymous Poll
29%
1 Peclet Number
43%
2 Reynolds Colburn Analogy
22%
3 Reynolds Number
6%
4 None of the above
The answer to the above poll is
2 Reynolds Colburn Analogy. It is given by St*Pr^(2/3)=Cf/2.
Just by knowing local skin friction coeffecient at any local location we will get local convective heat transfer coefficient.
Whereas Peclet no. is the product of Reynolds no. and Prandtl no. which is not required here.
2 Reynolds Colburn Analogy. It is given by St*Pr^(2/3)=Cf/2.
Just by knowing local skin friction coeffecient at any local location we will get local convective heat transfer coefficient.
Whereas Peclet no. is the product of Reynolds no. and Prandtl no. which is not required here.
In an SI Engine (Gasoline Engine) , what kind of fluid motion is desirable for better combustion
Anonymous Poll
20%
1 Laminar Flow
64%
2 Turbulent Flow
13%
3 Transition Flow
3%
4 None of the above
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The answer to the above poll is
2 Turbulent flow - The value of convective heat transfer coefficient in turbulent flow is more than in laminar flow.
In SI Engine we require heat transfer in very short duration hence we use Swirl or Tumble method for air fuel mixture to flow in the cylinder. In swirl motion the charge travels in cycloidal profile which increases turbulancy.
2 Turbulent flow - The value of convective heat transfer coefficient in turbulent flow is more than in laminar flow.
In SI Engine we require heat transfer in very short duration hence we use Swirl or Tumble method for air fuel mixture to flow in the cylinder. In swirl motion the charge travels in cycloidal profile which increases turbulancy.
Bernoulis can be applied between any two points on a streamline of rotational fluid flow?
Anonymous Poll
64%
True
36%
False
The answer to the above poll is
True- In a streamline flow even if the flow field is rotational we can apply Bernoulis equation.
Here is the link of NPTEL about it - https://nptel.ac.in/content/storage2/courses/112104118/lecture-14/14-1_bernouli_eqn_irrotational_flow.htm
True- In a streamline flow even if the flow field is rotational we can apply Bernoulis equation.
Here is the link of NPTEL about it - https://nptel.ac.in/content/storage2/courses/112104118/lecture-14/14-1_bernouli_eqn_irrotational_flow.htm
In which of the turbines velocity of flow is always equal at the inlet and exit?
Anonymous Poll
24%
1 Francis
42%
2 Kaplan
18%
3 Pelton
15%
4 All of these
Fundamentals of Mechanical Engineering ❤️ pinned «In which of the turbines velocity of flow is always equal at the inlet and exit?»
In Ideal Brayton cycle for Maximum thermal efficiency the work outpot will be 0
Anonymous Poll
54%
True
37%
False
9%
Cannot say
Fundamentals of Mechanical Engineering ❤️ pinned «In Ideal Brayton cycle for Maximum thermal efficiency the work outpot will be 0»
Centre of Mohr circle is always on X axis
Anonymous Poll
71%
True
12%
False
17%
Can be anywhere in the xy plane
Fundamentals of Mechanical Engineering ❤️
In which of the turbines velocity of flow is always equal at the inlet and exit?
The answer to this poll is
Kaplan Turbine - Velocity of flow will be equal in Kaplan turbine because it is an Axial flow turbine and inlet and exit area are same.
So discharge will be A1Vf1=A2Vf2
(A1=A2)
Hence Vf1=Vf2
Kaplan Turbine - Velocity of flow will be equal in Kaplan turbine because it is an Axial flow turbine and inlet and exit area are same.
So discharge will be A1Vf1=A2Vf2
(A1=A2)
Hence Vf1=Vf2
Fundamentals of Mechanical Engineering ❤️
In Ideal Brayton cycle for Maximum thermal efficiency the work outpot will be 0
The answer to this poll is
True- For maximum thermal efficiency when we compress the gas upto maximum material limit condition we cannot apply further heat from outside hence area on TS diageam gives net heat or work done by the cycle which is 0 in this particular case.
True- For maximum thermal efficiency when we compress the gas upto maximum material limit condition we cannot apply further heat from outside hence area on TS diageam gives net heat or work done by the cycle which is 0 in this particular case.
Fundamentals of Mechanical Engineering ❤️
Centre of Mohr circle is always on X axis
The answer to the poll is True
The centre of Mohr's Circle has to be on the x axis for stable equilibrium.
The shear stress values will change and the there will be external moment due to the extra value of shear stress which will rotate the body.
So it is a must condition that origin of Mohr circle should be on the X axis.
The centre of Mohr's Circle has to be on the x axis for stable equilibrium.
The shear stress values will change and the there will be external moment due to the extra value of shear stress which will rotate the body.
So it is a must condition that origin of Mohr circle should be on the X axis.
For having same cross sectional area which shaft should be preffered for Power Transmission?
Anonymous Poll
27%
1 Solid Shaft
71%
2 Hollow Shaft
2%
3 Any one