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#1. Can you spot the passive component?
#2. What is impedance?
The ratio of the change in an electric charge in a system to the corresponding change in its electric potential
Electromotive force to be generated by a change in the current flowing
Impedance is the sum of the resistance and reactance of an electrical circuit measured in Ohms
#3. Utilization of 3D component models in the PCB layout can assist with:
Core material selection
#4. What is Surface Mount Technology (SMT)?
Component leads are placed into drilled holes on a bare PCB
Components are mounted directly onto the surface of the PCB
None of the above
#5. The life cycle of an electronic component is an important attribute that should be considered during PCB assembly.
#6. Identify the quad flat no-leads (QFN) package.
#7. Why use a Ball Grid Array (BGA) in a circuit?
BGAs have a higher density of connections than a conventional SMT package of the same size
BGAs are mounted closer to the surface of the PCB which leads to a lower lead inductance, lower levels of distortion, and superior electrical performance
All of the above
#8. What are the factors that play a prominent role in components placement?
Placement of support components like resistors and capacitors initially, and then placing big/main/critical components such as MCU, DSP, FPGA, DDR, and clock devices around them
Placement of big components like QFP, BGA, SOP, SOIC, or through hole connectors and isolation of analog, digital, and power supply section
Clock driver/synchronizer should not be located close to clock oscillator
#9. What is the function of a bypass capacitor?
To conduct an alternating current around a component or group of components. The AC is removed from an AC/DC mixture
To decouple AC and DC signals so as not to disturb the quiescent point of the circuit when AC signals are injected at the input
Bypasses DC noise present in AC signals
#10. What is the purpose of local fiducial marks with respect to component placement?
Fiducials serve as the reference position during PCB assembly
Fiducials assist in choosing the prepreg material
Fiducial hide from machine vision recognition systems
#11. What do inaccurate BOMs lead to?
Wrong component quantity/inaccurate inventory
Incorrect costing of product/accounting variances
All of the above