Mitsubishi Electric India Interview Questions and Answers

The required capacity of the ctm machine in KN to test a cube of m 40 grade is dependent on the size of the cube and the testing standards.

• The capacity of the ctm machine is determined by the maximum load it can apply to the cube during testing.

• The cube size and testing standards determine the load requirements for testing.

• The required capacity can be calculated using the formula: Required capacity = Cube size x Testing standards

The water cement ratio can be reduced by using less water or increasing the amount of cement in the mixture.

• Use a lower water content in the mix

• Increase the amount of cement in the mix

• Use additives or admixtures to improve workability without increasing water content

• Optimize the particle size distribution of the aggregates

• Use a higher grade of cement

Precautions on cube mould before casting

• Ensure the cube mould is clean and free from any debris or previous concrete residue

• Apply a thin layer of oil or release agent to the inner surfaces of the mould to prevent sticking

• Check for any cracks or damage in the mould and replace if necessary

• Ensure the mould is properly aligned and securely fastened to prevent any leakage

• Use a vibrating table or vibrating rod to remove any air bubbles and ensure proper compaction

• Label the mould w...read more

Water cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. It affects the strength and durability of concrete.

• Water cement ratio determines the workability of concrete. Higher water content makes the mix more fluid and easier to work with.

• Excess water in the mix can lead to segregation and bleeding, resulting in a weaker and less durable concrete.

• A lower water cement ratio produces a stronger and more durable concrete, but it may be...read more

Admixtures are substances added to concrete or mortar to enhance its properties.

• Water-reducing admixtures: reduce the amount of water needed for the desired workability of concrete.

• Retarding admixtures: delay the setting time of concrete, allowing more time for placement and finishing.

• Accelerating admixtures: speed up the setting time of concrete, useful in cold weather conditions.

• Air-entraining admixtures: create small air bubbles in concrete, improving its resistance to fre...read more

Sieve analysis is a method used to determine the particle size distribution of sand.

• Sieve analysis involves passing a sample of sand through a series of sieves with different mesh sizes.

• The sand is placed on the top sieve and shaken to separate particles based on size.

• The weight of sand retained on each sieve is measured and used to calculate the percentage of sand in each size range.

• The results of sieve analysis can be used to assess the quality and suitability of sand for v...read more

The frequency of cubes casting refers to how often cubes are made for testing purposes.

• The frequency of cubes casting depends on the project requirements and quality standards.

• It is common to cast cubes at regular intervals during construction projects.

• The frequency may vary based on factors such as the type of concrete being used and the project timeline.

• For example, in a large-scale construction project, cubes may be cast every week or every few days.

• The cubes are then test...read more