PCEI Chapters 1-3 Quiz

One design goal is incubators must keep the babies within which temperature range?

• 40 - 45 degree Celsius

• 36.5 - 37.5 degree Celsius

• 35 - 37 degree Celsius

• 38.5 - 39.5 degree Celsius

Answer explanation

The correct temperature range for incubators is 36.5 - 37.5 degrees Celsius, as this range is optimal for maintaining the health and stability of newborns, ensuring they are kept warm without overheating.

The heating materials do NOT need to be reusable.

• True

• False

Answer explanation

The statement is false because heating materials often need to be reusable to ensure efficiency and sustainability. Non-reusable materials can lead to waste and increased costs.

The incubator must keep the baby's average temperature close to

• 35 degree Celsius

• 40 degree Celsius

• 37 degree Celsius

• 32 degree Celsius

Answer explanation

The incubator must maintain the baby's average temperature around 37 degrees Celsius, which is the normal body temperature for infants, ensuring proper growth and development.

One of the requirements of our incubator project is that the design must function using electricity.

• true

• false

Answer explanation

The statement is false because the design does not necessarily have to function using electricity. It could operate using alternative energy sources or mechanisms.

Which of these are NOT one of the project design criteria?

• Keep baby's temperature as close to 37 degrees Celsius as possible.

• Minimize the time outside of the healthy temperature range.

• Keep costs high.

• All three of these are our project design criteria.

Answer explanation

The correct choice is 'Keep costs high.' This is not a project design criterion, as the goal is typically to minimize costs while ensuring the baby's temperature is maintained within a healthy range.

PCMs are substances that store and release large amounts of energy during the phase changes of melting and freezing.

• True

• False

Answer explanation

True. PCMs (Phase Change Materials) indeed store and release significant energy during their melting and freezing processes, making them effective for thermal energy management.

Different PCMs need different amounts of ___________ to release their energy.

• liquid

• time

• fuel

• money

Answer explanation

Different phase change materials (PCMs) require varying amounts of time to release their stored energy, as the rate of energy release depends on their specific thermal properties and phase transition processes.

As a PCM loses energy, its molecules experience a _________________ in their freedom of movement.

• increase

• decrease

Answer explanation

As a PCM loses energy, its molecules slow down and become more ordered, leading to a decrease in their freedom of movement. Thus, the correct answer is 'decrease'.

When a PCM gains energy, the molecules experience a ___________ in their freedom of movement.

• increase

• decrease

Answer explanation

When a PCM gains energy, its molecules move more freely, leading to an increase in their freedom of movement. Therefore, the correct answer is 'increase'.

How will our incubator PCMs be reheated/reset?

• Place them close to a heat source such as fire

• Plug them into an electric heater.

• Place them in boiling water.

• They cannot be reheated or reset.

Answer explanation

The correct method to reheat or reset our incubator PCMs is to place them in boiling water. This method effectively restores their temperature without risking damage, unlike other options that may be unsafe.