Question

In: Mechanical Engineering

Which of the following is least likely to decrease the thermal contact resistance between two media...

Which of the following is least likely to decrease the thermal contact resistance between two media in contact?

Make a vacuum gap at the interface

Apply thermal grease onto the interface

Sand the contact surface smooth

Apply pressure one against another

Solutions

Expert Solution

Answer:

(A) Make a vacuum gap at the interface

Explanation:

(A) Vacuum gap or air gaps between two contact surfaces will INCREASE the thermal contact resistance because of less thermal conductivity of air. This creates an extra layer of low conductive material for the heat transfer or in other words increases the overall thermal resistance.

(B) Thermal grease increases the conductivity, hence it will very much likely to decrease the contact resistance

(C) Surface roughness tends to increase the contact resistance. Hence sanding the contact surface will decrease the contact resistance

(D) Applying pressure will increase the contact surface area and hence increase the thermal flow and therefore will definitely decrease the thermal resistance.


Related Solutions

3. Which is least likely to be the reason for resistance to major changes in job...
3. Which is least likely to be the reason for resistance to major changes in job content and procedures by people who have been doing the job with moderate success for many years? a.​concern about their future job security in the organization ​b.​concern about not being able to adjust to the necessary changes ​c.​concern about the high cost to the organization of making the changes ​d.​a belief that the proposed changes are unnecessary
Which of the following is the most likely outcome of a decrease in the minimum wage?...
Which of the following is the most likely outcome of a decrease in the minimum wage? Please also provide an explanation. a) an increase in the number of unskilled workers who are involuntarily unemployed b) an increase in the number of people who are voluntarily unemployed c) a shift to the right of the demand for unskilled workers d) a shift to the left of the supply of skilled workers e) a shift to the left of the supply of...
Two objects, A and B, at initial temperatures TA and TB are placed into thermal contact....
Two objects, A and B, at initial temperatures TA and TB are placed into thermal contact. If TA > TB, cA > cB, and mA > mB, why is the equilibrium temperature of both objects closer to TA than TB? a) Less heat flows out of object A than flows into object B, and so TA changes less than TB changes b) The same amount of heat flows out of A as flows into B, but it takes more heat...
Which of the following is least likely to be included in the tax constraint for an...
Which of the following is least likely to be included in the tax constraint for an individual investor? a. The federal withholding tax from the individual's employment income. b. The tax liability from a taxable lump sum received as part of an employment contract. c. Property taxes to be paid during the upcoming year from ownership of a beach house. d. Capital gains taxes owed on the sale of a watch worn by Benjamin Franklin.
Which of the following changes will likely increase the solubility of a solid solute but decrease...
Which of the following changes will likely increase the solubility of a solid solute but decrease the solubility of a gaseous solute? A. Increasing the temperature B. Increasing the molecular mass of the solute C. Decreasing the atmospheric pressure D. Decreasing the concentration
Q33 Which of the following statements is least likely to lead to a conclusion that the...
Q33 Which of the following statements is least likely to lead to a conclusion that the taxpayer was undertaking the mere realisation of a capital asset? a. The land was surplus to the taxpayer’s needs in carrying on the taxpayer’s manufacturing business. b. The taxpayer set up their own on-site sales office to assist with the sale of the blocks of land. c. The taxpayer developed the land to the extent necessary to get local council approval and no more....
Which of the following would most likely cause both a decrease in the price of McDonalds’...
Which of the following would most likely cause both a decrease in the price of McDonalds’ Big Mac hamburgers and a decrease in the number sold? a. an increase in the supply of McDonalds’ Big Mac hamburgers b. an increase in the demand for McDonalds’ Big Mac hamburgers c. a decrease in the supply of McDonalds’ Big Mac hamburgers d. a decrease in the demand for McDonalds’ Big Mac hamburgers
Which of the following three situations is least likely to occur at the same time as...
Which of the following three situations is least likely to occur at the same time as the other two situations? Why? a-Real GDP is less than potential GDP. 
 b-An economy in a strong, 5-year expansion. 
 c-An unemployment rate above the natural rate of unemployment.
which of the following is least likely to be included in accumulated other comprehensive income as...
which of the following is least likely to be included in accumulated other comprehensive income as a component of stockholders equity? a. foreign currency transaction gain. b. net unrealized changes in the value of available for - sale securities. c. net gain or loss from derivative cash flow hedged. d. Pension plan prior to service cost adjustment.
Which one of the following types of contracts is least likely to be considered a contract...
Which one of the following types of contracts is least likely to be considered a contract of adhesion? A) homeowners policy contract B) commercial fire insurance policy contract C) manuscript or customized policy contract D) personal auto policy contract
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT