7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm

Question
7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a
velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number
of transistors that can be placed on this plate.
FIGURE P7-34
Aluminum
Power
plate
transistor, 5 W
35°C
25 cm
Air →
4 m/s
-65°C
25 cm
View transcribed image text
Expand

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Engineering
Mechanical Engineering

Related Mechanical Engineering Q&A

Find answers to questions asked by students like you.

Q: Steam enters a nozzle operating at steady state at 20 bar, 263°C, with a velocity of 52 m/s. The exi...

A: Given data,

Q: Hi, the attached image shows a question and its answer but still, I couldn't understand it please si...

A: In order to understand the solution given here, first of all understand the phase diagrams provided ...

Q: help me to understand that square or 90 degrees on 42 kn. how is that applied to get the solucion? s...

A: Draw the section L-M which divide the truss into two parts such that it consists the members BC, CF ...

Q: I need these three parts answered (Multiple Choice). If you can not answer all three parts please le...

A: In the note 7 it is mention that the center line of the belt groove and the main axis are perpendicu...

Q: Carbon Oxide (CO) initially occupying 1.8 m3 at 5.2 bar, 246.85°C undergoes an internally reversible...

A: In the problem it is provided that the CO follow the reversible expansion process pv1.4=constant. Si...

Q: I need parts 2 and 3 answered please and thank you.

A: 2.Revision history block is placed in the top right corner of the part diagram. In the Revision hist...

Q: I need answers to parts 4, 5, and 6, pertaining to the print provided.

A: Fillet weld should be used to “TACK TYP” the parts associated with item 4 in place. The indicated sy...

Q: Problem 3.091 SI Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 ba...

A: Click to see the answer

Q: Determine the components of reaction at support A and B. [C is a pin] Ax:  Ay: Bx:  By:

A: Click to see the answer

Q: Two blocks A and B, each having a mass of 3.5 kg , are connected by the linkage shown. Neglect the w...

A: Consider Block A. Applying the equilibrium conditions, we get:

Q: 6-21 A metal plate is being cooled by air (kuid = 0.259 W/m-K) at the upper surface while the lower ...

A: Given Data,

Q: For the truss shown below, use the method of joints to: a) find the forces in members DE and CD, and...

A: Given data as per question

Q: 16. A roller-coaster car (Fig. P6.16) has a mass of 500 kg when fully loaded with passengers. The pa...

A: (a)Consider point A. The force due to gravity (weight) acts in the downward direction and normal for...

Q: I need these 3 parts answered TRUE or FALSE.

A: Control frame has three compartments,Characteristic control compartment.Tolerance zone compartmentDa...

Q: I need answers to parts 13, 14, and 15, pertaining to the print provided.

A: What is the smoothest surface finish specified on this print?Refer note, generally 6.3 is given to a...

Q: I need these three parts answered, if you are unable to answer all three parts please leave it for a...

A: 4.The number 81073 denotes the CAGE no. as shown in the print. The CAGE code indicates Commercial an...

Q: A cast-iron pipe system consists of a 500-ft section of water pipe, after which the flow branches in...

A: Applying bernoulli's equation,

Q: I need answers for questions 1, 2, and 3, pertaining to the print provided.

A: Note:As we are entitled to answer only a single question. We’ll answer question no. 1 for you. Pleas...

Q: Data are provided for steady-state operation of an electric motor in figure below, where hA = 5 W/K....

A: Click to see the answer

Q: I need help solving these 3 simple parts, if you can not answer all 3 parts then please leave it for...

A: (1)Regardless of feature size system of tolerance is used in older standards, but in current standar...

Q: Find the velocity of flow and rate of flow of water through a rectangular channel of  6 m wide and 3...

A: Given:

Q: 5. Consider a building whose annual air-conditioning load is estimated to be 120,000 kWh in an area ...

A: Given data:Annual load L = 120,000 KWhPer unit cost of electricity = $0.10/KWhCOP of A = 3.2COP of B...

Q: I need part 10 answered pertaining to the print and instructions.

A: In the given sketch,Number 2 and Number 4 are relief valves. Number 2 is high-pressure relief valve....

Q: Textbook: Statics and Strengths of Materials, 6th EditionProblem: Chapter 13, Problem 13.3AURL: http...

A: By balancing the vertical forces,

Q: 31. (USCS units) A GO/NO-GO plug gage will be designed to inspect a 2.000 0.002 mm diameter hole. A ...

A: Given data as per questionDimension of object to be inspected =2.000±0.002mmWear allowance =5%Maximu...

Q: I need answers for questions 7, 8, and 9 pertaining to the print provided.

A: 7.Refer the revision history block,The pin in revision A1 is referred to as the ejector pins.

Q: I need these three parts answered pertaining to the print provided below.   This part features a V-g...

A: Note: We are authorized to answer one question at a time. Since you have asked three questions at ti...

Q: I need answers to these 3 parts for a review activity.

A: Surface texture symbol placed on the surface or edge of the part feature either directly or using le...

Q: I need answers for problems 10, 11, and 12 pertaining to the print provided.

A: (10). Yes, there are auxiliary views shown in the drawing.

Q: Hot water at 50 °C is routed from one building in which it is generated to an adjoining building in ...

A: Given:

Q: (USCS UNITS) A GO/NO GO PLUG GAUGE WILL BE DESIGNED TO INSPECT A 2.000 +/- 0.002mm DIAMETER HOLE. A ...

A: Given data,

Q: what lay symol is indicated on one of the surface texture symbols

A: Lay symbol is like perpendicular symbol which is represented just above line on the surface texture ...

Q: The floor-polishing machine rotates at a constant angular velocity. (Figure 1) If it has a weight of...

A: Given Data:The machine is rotating at a constant angular velocity.Weight of the machine W = 76 lbCoe...

Q: Tech A says that the weight of the flywheel smoothes out the engine’s power pulses. Tech B says that...

A: Flywheel: A flywheel is a mechanical device having higher value of moment of inertia. This high mome...

Q: I need help solving these 3 simple parts, if you can not answer all 3 parts then please leave it for...

A: The symbol which is used for surface texture is given below.  Readings in the symbol can be given ei...

Q: Water at a temperature of 35 °C is flowing steadily in a 2.5 mm diameter, 15-meter long tube at an a...

A: Given data as per question

Q: I need answers to parts 10, 11, and 12, pertaining to the print provided.

A: Hii,thanks for the question but there is only 10th  question so we are answeering only 10th question...

Q: I have three parts that need to be answered pertaining to the print provided below.   What size pape...

A: Question:1The original version of engineering drawing sheet belongs to ISO A-series paper. 

Q: Please solve using Mass moment of Inertia, Relative acceleration equations if need be, and equilibri...

A: Consider, there is no effect of friction on the bar. Because there is no data provided in the questi...

Q: Determine the electrical power supplied to a boiler when the temperature of the entering water is 20...

A: Considering the steady state condition, evaluate the electrical power supplied to the boiler for the...

Q: I need answers to this part, thank you.

A: Circular Runout-----It defines a circular tolerance zone which associated with datum axis. It contro...

Q: A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 400°F. The water un...

A: Given:

Q: I need these 2 parts answered pertaining to the print provided. If you can not answer all 2 parts, p...

A: AP-001The diameter of the hole that is inclined 15 is ϕ0.25. It can be viewed in the section A provi...

Q: Define and explain how CAM and CAE work with CAD?

A: CAM is an abbreviation for Computer-supported assembling. It utilizes PC programming to control mach...

Q: I need answers to questions 7, 8, and 9 pertaining to the print provided.

A: To improve the performance of the parts, several changes and inspection are carried out. All the mod...

Q: k = 40 lb/ft A 21.5' cantilevered wood 2"x4" beam is connected on its end to a 3. spring with a 15 l...

A: Write the expression for the maximum deflection of the cantilever beam when a load acts at its tip. ...

Q: 4 2E (L-)y + (2+V) Py 6 E1 Gruen 2 e Ext Ey 4tViC-2V) Find Ex )Ey=ddy 3) ddy 4) dd G Cay)=tv 61 Cay ...

A: Since we question only three subparts, we will answer the part 1,2, and 3. Please submit the questio...

Q: solve (d) part of Q7 asap

A: Consider the simple gas refrigeration cycle,

Q: Technician A says that some shift solenoids can be activated by providing a ground for the solenoid....

A: The shift solenoid is used in the gear assembly which shifts the gear according to the desire of dri...

Q: Problem 3: A turbulent flow in a pipe has a Reynolds number of 200,000. The pipe diameter is 125 mm,...

A: Given data:Diameter of pipe D = 125 mmReynold’s nuvmber Re = 200,000(a); The relative roughness of t...

Transcribed Image Text

7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm