Impacts thermiques pour les électronicien - Simulation

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1.

What is the heat transfer coefficient ?

An alternative quantity for the thermal conductivity of a material

An alternative quantity for the thermal resistance of a surface to ambient

A quantity used to classify the sales price of a heat sink

2.

What is describing heat conduction ?

Newton’s Law

Fourier’s Law

Planck’s Law

3.

What are the possibilities to significantly improve vertical heat conduction with thermal vias ?

Increase the diameter of the vias

Filling with solder resist

Multiply the number of vias in a reasonable way

4.

A board is screwed and additionally glued with a heat sink. What is correct with regard to the adhesive used ?

The adhesive should displace air inclusions in roughness valleys

The adhesive should be applied as thick as possible

Heat conducting adhesives are very good heat conductors

5.

When do thermal vias make most sense ?

If there is a single major heat source on the PCB

If the PCB is cooled by airflow from a fan

If the PCB is mounted on a heat sink

6.

What favors the heat radiation of a printed board assembly ?

Painted surfaces

Glossy surfaces

Few components

7.

What is true about a data sheet value Rth,Junction-Ambient of a component ?

It is a value which is unique for a component

It is a figure of merit to classify the thermal behavior of components

Multiply with power and you can accurately predict the temperature

8.

What is an ingredient to determine the Junction-ambient thermal resistance according to JEDEC ?

An imaging infrared camera

A transparent plastic box

A climate chamber with a window

9.

What is “FR-4” ?

The PCB material No. 4 invented by Fred Richardson

A notation: flame retarded

A PCB material with thermal conductivity around 4 W/m-K

10.

How can embedded busbars help in case of high-currents ?

Increase heat spreading

Reduce the resistance

Increase the heat transfer coefficient

11.

What can power planes in a multilayer PCB be used for in terms of cooling ?

Distributing the heat over larger areas

Improvement of paint adhesion

Improvement of solderability

12.

What is the meaning of “current carrying capacity” ?

If the ohmic resistance of a trace remains below a specified maximum value

The current flow from A to B is guaranteed by the layout

The current at which the temperature of the trace remains below a required threshold and thus does not damage the circuit board