J. Kumar Infraprojects Senior Engineer Interview Questions and Answers

The test procedures for cement, steel, coarse aggregate, and sand involve various physical and chemical tests to ensure quality and suitability for construction purposes.

• Cement: Tests include fineness, setting time, compressive strength, soundness, and chemical composition.

• Steel: Tests involve tensile strength, yield strength, elongation, and chemical composition.

• Coarse Aggregate: Tests include sieve analysis, specific...read more

The grade of concrete refers to its strength and durability.

• Concrete is graded based on its compressive strength, measured in megapascals (MPa).

• Common grades of concrete include M10, M15, M20, M25, etc.

• The higher the grade, the stronger the concrete.

• Different grades of concrete are used for different applications, such as foundations, slabs, columns, etc.

28 days cube strength is a measure of the compressive strength of concrete after 28 days of curing.

• 28 days cube strength refers to the compressive strength of concrete cubes after they have been cured for 28 days.

• It is an important parameter to assess the quality and durability of concrete.

• The value of 28 days cube strength is typically expressed in megapascals (MPa) or pounds per square inch (psi).

• It is determined by ...read more

The rate of different diameters of couplers can vary based on the specific type and manufacturer.

• The rate of different diameters of couplers can depend on factors such as material, quality, and brand.

• Some common diameters for couplers include 1/2 inch, 3/4 inch, and 1 inch.

• Rates may also vary based on the intended use of the coupler, such as for plumbing or electrical connections.

Rate of threading varies based on the diameter of the thread.

• The rate of threading increases with larger thread diameters.

• Smaller thread diameters require slower threading rates to prevent damage.

• Factors such as material type and cutting tool also impact threading rate.

• For example, a 1/4 inch thread may have a different threading rate than a 1 inch thread.

HDPE and Di pipe IS codes are standards set by the Bureau of Indian Standards for high-density polyethylene and ductile iron pipes.

• IS 4984: High-density polyethylene (HDPE) pipes for potable water supplies

• IS 8329: Ductile iron (DI) pipes and fittings for pressure pipelines

Aerators are devices used to add air into water or other liquids to increase oxygen levels.

• Surface aerators

• Submersible aerators

• Diffused aerators

• Mechanical aerators

• Aspirating aerators

There are various types of PM (Programmable Logic Controllers) and valves used in engineering.

• Types of PM include PLC (Programmable Logic Controller), DCS (Distributed Control System), and SCADA (Supervisory Control and Data Acquisition).

• Types of valves include gate valves, globe valves, ball valves, butterfly valves, and check valves.

• Each type of PM and valve has its own specific applications and advantages.

• For exampl...read more