EM 4.13 Comprehension Test — Chapter 4 Quiz

In what year was a PID first installed in a domestic espresso machine?

• 2001
• 2008
• 1990
• 1961

In what year was the first PID-controlled multi-boiler released?

• 1961
• 1990
• 2008
• 2001

What is the definition of offset temperature?

• The difference between the temperature of the water in the heat exchanger and the temperature of the water in the boiler
• The difference between the temperature of the brew boiler and the temperature of the espresso exiting the portafilter
• The difference between the temperature of the water exiting the group head and the temperature of the puck
• The difference between the temperature of the water in the boiler and the temperature of the water exiting the group head

Fill in the blank: To enable temperature profiling, it is useful to have a low _____ in the group head.

• profile
• water level
• thermal mass
• temperature

How does the Decent espresso machine manage flow?

• By using PIDs in three separate parts of the machine
• By counting the pulses of the machine’s vibration pump
• By using an app that links to your smartphone
• By having a group with a very high thermal mass