PCB(5)_Electrical Design Considerations

What is the basic requirement of printed board extraction tools?

• Not consider components

• Use a minimum of board space

• Cause damage to the board

• Maximize board space

Why are smaller boards preferred for testing and repairing PCBs?

• To complicate the repair process

• To achieve efficient testing and repair

• To increase isolation of defective parts

• To make testing complex

What is the advantage of having an electronic circuit split into sub-units on different boards?

• It allows for common subunits to be used for other equipment

• It makes isolation of defective parts difficult

• It increases the cost

• It reduces the testing complexity

What is the standard thickness of most rigid printed boards?

• 0.50 mm

• 6.5 mm

• 3.0 mm

• 1.5 mm

Which standard identifies the generic physical design principles and material selection for PCBs?

• IPC-6012

• IPC-2220

• ISO 9001

• ANSI/IPC 2221 Generic design

What is the resistance of a 1mm wide copper conductor per cm of length?

• 0.001 ohms

• 0.005 ohms

• 0.01 ohms

• 0.1 ohms

What is the specific resistivity of silver?

• 1.8 Wmm2/cm

• 3.0 Wmm2/cm

• 5.4 Wmm2/cm

• 1.6 Wmm2/cm

How can the capacitance coupling between adjacent tracks be minimized?

• Run signal conductors far from the ground line

• Provide less spacing between conductors

• Increase the conductor width

• Run a ground line between critical conductors

What is the recommended current carrying capacity for a 0.05 inch wide trace on a 2 oz copper board?

• 5.5 Amps

• 2.5 Amps

• 1.5 Amps

• 4.0 Amps

Why is it important to provide adequate insulation distances in PCBs?

• To decrease insulation reliability

• To decrease the level of integration

• To increase electrical stresses

• To achieve the desired level in insulation reliability