Difference between the open and closed systems, Mechanical Engineering

Assignment Help:

Provide short answers to the following questions:

a)   What the necessary condition for a heat transfer process to occur?

b)   What is a difference between the steady state conditions and the thermal equilibrium state?

c)   Is it possible for the steady state temperature profile in a plane wall to be nonlinear at steady state? If yes, provide one example.

d)   Why do you feel cooler during a windy day than during a calm day even though the air temperature is the same?

e)   Why it is more likely to get burn by putting a bare hand into boiling water at 100oC then into hot air at 200oC?

f)   What is a temperature gradient within an object sitting in a room in which the temperature is maintained constant after a sufficiently long time?

g)   Is it possible that the surface temperature of the object from part f) to be different than the room air temperature? If yes, please explain why?

h)   What is the primary reason for a ground frost (air temperature is greater than zero)? For a given air temperature, is ground frost more likely to occur at windy or calm conditions?

i)    What is a difference between and opaque and semitransparent object?

j)    What is the primary reason for the surfaces of different objects to be different when they exposed to sunlight?

k)   What is the difference between the open and closed systems?

l)    What is the inherent difference between application of conservation of energy over a time interval and at an instant of time?

m)  Why the form of the energy balance for a surface of an object at steady and unsteady state conditions is the same?

n)   What is the primary reason irreversible operation of the actual heat engines?

o)   What is the effect of the power output of the actual heat engine on its efficiency? Please explain.


Related Discussions:- Difference between the open and closed systems

Mechanical efficiency, The following data were obtained from a test on a si...

The following data were obtained from a test on a single cylinder, double acting steam engine fitted with a rope brake. Cylinder diameter 200mm Stroke 250mm Speed 5rev/min Effec

Find cutting speed for prolonging tool life , Find Cutting Speed for Prolon...

Find Cutting Speed for Prolonging Tool Life A form tool machining at 24 m/minute requires re-sharpening after 30 minutes. What should be the cutting speed for prolonging tool

Determine mass of air needed for complete combustion, How are fuels divided...

How are fuels divided ? Write disadvantages and advantages of each types. (b) A sample of coal supplied to a boiler has the following composition by mass : Carbon = 88%, Hydr

Merchant force circle diagram, (a) Draw neatly and accurately the Merchant ...

(a) Draw neatly and accurately the Merchant force circle diagram. Mention clearly the forces involved, the constructional steps and the assumptions made [do not derive the forces]

Theory of machine, Kleines contruction for slider mechanism

Kleines contruction for slider mechanism

Determine the residual plastic strain in the members, As part of the fitti...

As part of the fitting of the mooring lines to a wave energy device, the pin-jointed structure shown in Figure Q is to be subjected to a small degree of plastic deformation by appl

Classification of power sources according to construction, CLASSIFICATION O...

CLASSIFICATION OF POWER SOURCES ACCORDING TO CONSTRUCTION & DESIGN To give the desired output a power source may be constructed with different components. Therefore, a classifi

Roller spot welding, Roller Spot Welding In this process, a series of ...

Roller Spot Welding In this process, a series of intermittent spot welds are made using wheels or rollers as electrodes. The rollers are power driven and are stopped while ind

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd