1. Directions

You will read passages on the topic and then answer questions about them. You may find vocabulary at the end of the test. Read the questions carefully before choosing the correct answers.

2. Questions of the test

Question 1. What is a concrete mixer used for?
A) Mixing cement, aggregate, and water to form concrete
B) Mixing paint, water, and oil to form a coating
C) Mixing flour, sugar, and butter to form a dough
D) Mixing sand, gravel, and water to form a foundation

Question 2. How is concrete typically mixed at a construction site?
A) By hand in a wheelbarrow
B) By hand using a modified tarp
C) Using a portable concrete mixer
D) Using a stationary concrete mixer

Question 3. Who invented the concrete mixer?
A) Gebhardt Jaeger
B) Isaac Newton
C) James Watt
D) Thomas Edison

Question 4. Which type of concrete mixer is most commonly used for precast and prestressed concrete?
A) Twin-shaft mixers
B) Vertical axis mixers
C) Drum mixers
D) Planetary mixers

Question 5. What are some advantages of using a twin-shaft mixer for concrete production?
A) High intensity mixing and short mixing times
B) Efficient mixing action and ability to produce critical concrete mixes
C) High production outputs and ability to handle large volumes
D) Improved consistency and homogeneity