The minimum concentration of antifreeze is a 20

17. The minimum concentration of antifreeze is _____.
A. 20% antifreeze, 80% water
B. 33% antifreeze, 66% water
C. 44% antifreeze, 56% water
D. 50% antifreeze, 50% water
Written Assessment – AURTTC003
Aspen College
Page 6 of 19

AURTTC003 Diagnose and repair cooling systems
18. List three (3) different types of antifreeze.
19. In most automotive applications, the water pump is driven by the ______.
20. Water pumps are _____ type pumps. 21. The heart of the cooling system is the water pump. Its job is to move the coolant through the system.
True or False:
22. What is the function of the thermostat?
23. During engine warm-up, when the thermostat is closed, _____.
Written Assessment – AURTTC003
Aspen College
Page 7 of 19

AURTTC003 Diagnose and repair cooling systems
24. Complete the following statement about bypass thermostats using the following words.