Railway Engineering Questions and Answers – Laboratory Tests for Physical Properties of Ballast

«
»

This set of Railway Engineering Multiple Choice Questions & Answers focuses on “Laboratory Tests for Physical Properties of Ballast”.

1. Los Angeles machine is used for which of the following tests?
a) Aggregate abrasion value
b) Aggregate impact test
c) Water absorption test
d) Flakiness index
View Answer

Answer: a
Explanation: The aggregate should have resistance to abrasion. The aggregate abrasion value is checked by using Los Angeles machine.
advertisement

2. What is the diameter of the cylinder used for Aggregate impact value?
a) 75mm
b) 75cm
c) 75 inches
d) 750cm
View Answer

Answer: a
Explanation: The ballast sample is oven dried and placed in a metal cylinder with 75mm diameter and 50mm depth. The ballast is duly tamped in different stages while placing.

3. What is the weight of the test hammer used for Aggregate impact value?
a) 14kg
b) 140 grams
c) 20kg
d) 1200 grams
View Answer

Answer: a
Explanation: Weight of the test hammer is about 14kg and it’s made to fall on the surface of the cylinder from a height of 380mm. The sample is subjected to 15 such blows.
Note: Join free Sanfoundry classes at Telegram or Youtube
advertisement
advertisement

4. Flakiness is the percentage by weight of particles with a least dimension less than ________ of their mean dimension.
a) Three-fifth
b) Two-third
c) Three-fourth
d) Two-fifth
View Answer

Answer: a
Explanation: Flakiness index of an aggregate is defined as the percentage by weight of particles with least dimensions less than three fifths of mean dimension. Size smaller than 6.3mm are not suitable for test.

5. What is the temperature for oven drying of aggregates for Specific gravity and water absorption test?
a) 50-60°C
b) 100-110°C
c) 27-32°C
d) 130-140°C
View Answer

Answer: b
Explanation: Weight of saturated aggregates in water, saturated dry aggregates in air and oven dried aggregates in air is taken for calculation of specific gravity and water absorption of aggregates.
advertisement

Sanfoundry Global Education & Learning Series – Railway Engineering.

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

advertisement

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
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.

Subscribe to his free Masterclasses at Youtube & technical discussions at Telegram SanfoundryClasses.