MCA Oral Exam Questions & Answers
(Grade A+)
What must occur before a sample of concrete can be taken from a
revolving drum mixer? -
correct answer ✅All water and admixtures must be added to the
mixer
When sampling from a stationary or revolving drum mixer, what is
collected and when is it taken during discharge? -
correct answer ✅In two or more portions of concrete, at regularly
spaced intervals, and from the middle of the batch
How are the sample portions obtained from the discharge stream
of a stationary or revolving drum mixer? -
correct answer ✅Repeatedly pass a receptacle through the entire
discharge system & completely divert the discharge stream into a
sample container
Describe the procedure for collecting a sample from a paving
mixture -
correct answer ✅Discharge the contents of the paving mixture and
obtain samples from at least 5 different portions of the pile
(Grade A+)
What must occur before a sample of concrete can be taken from a
revolving drum mixer? -
correct answer ✅All water and admixtures must be added to the
mixer
When sampling from a stationary or revolving drum mixer, what is
collected and when is it taken during discharge? -
correct answer ✅In two or more portions of concrete, at regularly
spaced intervals, and from the middle of the batch
How are the sample portions obtained from the discharge stream
of a stationary or revolving drum mixer? -
correct answer ✅Repeatedly pass a receptacle through the entire
discharge system & completely divert the discharge stream into a
sample container
Describe the procedure for collecting a sample from a paving
mixture -
correct answer ✅Discharge the contents of the paving mixture and
obtain samples from at least 5 different portions of the pile
