The answer to this poll is


2 Right side of centre of mass-
The laminar boindary layer will form on the left side of the ball as the direction of spin of the ball will help it.
And after that, turbulent layer will form after transition.
As we know laminar region will have more pressure than turbulent region so according to third law the ball will give reaction equal and opposite and thus follows the trajectory shown in the above image

The answer to this poll is


2 High
If specific heat at constant pressure is high the we need less tempearture i.e less compressor work is required to attain the state before inlet to the condenser.

The answer to this poll is


2 Low
To have less entropy, specific heat at constant pressure should be less such that more heat transfer is possible in the evaporator.

In lewis beam strength there is an assuption that the beam is of uniform strength.
This assumption is bit practical as we can make a beam of equal strenght either by varying its width linearly or by varying its depth parabollicaly.
Gear tooths when seen as a Cantilever joint we can observe that depth increases as we move from free end towards the fixed end of the tooth.

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The answer to the above poll is




2 Axis of back tyres

While taking a turn be it left or right back wheels do not change their orientation & steering is connected to front wheels.
By the concept of I centres we know that at a instant I centre is perpendicular to the direction of velocity.
So, the axis of front tyres must intersect to the axis of back tyres because I centres of both the back tyres will coincide with the axis of back tyres.
And to satisfy pure rolling all the I centres of all the 4 tyres should intersect at a common point.

To get more clarity refer this image

For wear strength we always make safe Pinion because more contact is of pinion rather than gear becuase pinion is of smaller size.
In checking beam strength we check by product of bending stress and tooth factor.
But to find wear strength we just directly design for pinion.


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The answer to both the polls is


1 Monoatomic gas
It is a lighter gas so it will show more movement and will tranfer more momentum to the piston than a diatomic or triatomic gas.

In Brayton cycle also compressor will require less power to compress a lighter gas which is monoatomic than dia or triatomic gas.

It can be found out from the formulae aslo
Efficiency =1-[1/(r^(1—1/¥))]
As gamma increases efficiency increases. Either by formula or by logic answer will be same.

Emailing 19680013054(1).pdf

NASA paper on type of working fluid
For more details refer it👆

The answer to the above poll is




1 Inward flow- Inward flow turbines are mostly used because discharge is constant and load variation is easy.

And we know that rate of change of angular momentum gives Torque applied.So more power will be generated in the inward flow because Torque=mvr1-mvr2
R1>R2
That is why outward flow turbines have very less practical usage.

In Psychometry chart Specific Humidity is plot on y axis and dry bulb temperature is plot on x axis. Specific humidity is a function of vapour pressure. So as we know as temperature increases vapour pressure increases whivh can be seen in Psychometric chart.

Specific humidity is calculated at a particular location and is the ratio of mass of vapour per kg of dry air.

Relative Humidity is indication of capacity of air to accomodate maximum vapor.
It is the ratio of Vapor pressure to saturated vapour pressure.

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