Maharashtra Seamless Mechanical Maintenance Engineer Interview Questions and Answers

Standards for pipe manufacturing and coating

• Pipe manufacturing standards include ASTM A53, A106, A333, and API 5L

• Coating standards include ASTM A775, A934, and A1065

• Coating types include fusion bonded epoxy, polyethylene, and polyurethane

• Standards ensure quality, durability, and safety of pipes and coatings

I seek information on the properties, uses, installation, and maintenance of ductile iron pipes.

• Properties of ductile iron pipes such as strength, durability, and corrosion resistance

• Uses of ductile iron pipes in water distribution, sewer systems, and industrial applications

• Installation methods for ductile iron pipes including trenchless technology and joint types

• Maintenance practices for ductile iron pipes to prevent

Ductile iron pipes are used for water and sewage systems. The manufacturing process involves casting molten iron into molds.

• Applications include water distribution systems, sewage systems, and industrial piping

• Manufacturing process involves melting iron, adding graphite for ductility, pouring into molds, cooling, and finishing

• Ductile iron pipes are known for their strength, durability, and corrosion resistance

The repeated burning of a 22 kW AOP motor CT cable may be due to overloading, short circuits, poor insulation, or incorrect cable sizing.

• Check for overloading of the motor causing excessive heat in the cable

• Inspect for short circuits in the motor or the wiring

• Ensure proper insulation of the cable to prevent overheating

• Verify if the cable size is appropriate for the motor's power requirements

Bypassing the CT of an AOP motor can lead to overcurrent and damage to the motor.

• Bypassing the CT can result in the motor drawing excessive current.

• This can lead to overheating of the motor windings.

• Overcurrent can cause damage to the motor components.

• It can also pose a safety risk due to potential electrical faults.