Concrete Technology Questions and Answers – Measurement of Workability

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Workability”.

1. How many types of tests are there to find workability?
a) 3
b) 4
c) 5
d) 6
View Answer

Answer: c
Explanation: There are 5 types of test to find the workability of a concrete i.e. slump test, compacting factor test, flow table test, vebe test, Kelly ball test.

2. These test find workability __________
a) Directly
b) Indirectly
c) 0
d) Equals to the weight of the cement
View Answer

Answer: b
Explanation: Unfortunately, there are no accepted tests, which can measure directly the workability.

3. Workability of concrete is measured by __________
a) Vicat apparatus test
b) Slump test
c) Minimum void method
d) Talbot Richard test
View Answer

Answer: b
Explanation: Work ability of concrete is measured by slump cone test, compaction factor test. Slump cone is used for medium work ability. For high work abilities it is not accurate.Slump values vary from 0 mm to 300 mm.
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4. Which test gives good results for rich mixes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test
View Answer

Answer: a
Explanation: This is a test used extensively in site work all over the world. Very useful in detecting variations in the uniformity of a mix of given nominal proportions.

5. Which test used for low workable concretes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test
View Answer

Answer: b
Explanation: The degree of compaction, called compacting factor, is measured by the density ratio, i.e. the ratio of the density of actually achieved in the test to the density of the same concrete fully compacted.

6. Which test Used for high workable concretes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test
View Answer

Answer: c
Explanation: Compacting factor test used for high workable concretes. It measures the diameter of spread after vibration.

7. Which test used for fiber reinforced concrete?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test
View Answer

Answer: d
Explanation: Start time after removing cone and stop counter once the transparent rider is covered with paste. Record in seconds. This is VeBe time.
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8. ___________ is practical in field test.
a) Slump test
b) Compacting factor test
c) Flow table test
d) Kelly Ball Test
View Answer

Answer: d
Explanation: It measures the depth of penetration. Kelly Ball Test is practical in field test.

9. What is the compaction factor for medium degree of workability?
a) .78
b) .85
c) .92
d) .95
View Answer

Answer: c
Explanation: The compaction factor for medium degree of workability is .92 and .78 is the compaction for a very low degree.
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10. What is the Vee-Bee time for medium degree of workability?
a) 10-20 sec
b) 5-10 sec
c) 2-5 sec
d) 35 sec
View Answer

Answer: c
Explanation: 2-5 sec is the Vee-Bee time for the medium degree of workability and 10-20 sec is for very low.

Sanfoundry Global Education & Learning Series – Concrete Technology.

To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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