Hitachi Energy Mechanical Engg. Design Interview Questions and Answers

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Q1. NTPC company have a water
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Q2. Material coal chamber
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Q3. Water cycle water supply
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Q1. Java question and core subject questions
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Q1. Technical case study
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Q1. What is process gear oil replacement
Ans. 
Process gear oil replacement is the procedure of draining out old gear oil from a system and refilling it with fresh gear oil.
• Drain out old gear oil from the system

• Ensure proper disposal of the old gear oil

• Refill the system with fresh gear oil

• Follow manufacturer's guidelines for the type and amount of gear oil to be used
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Q2. What have you done major activity
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Q1. What is the process de-ashing the from esp to silo.
Ans. 
De-ashing process from ESP to silo involves several steps.
• The ash is collected in hoppers located at the bottom of the ESP.

• The ash is then transported to the silo using a pneumatic conveying system.

• The ash is stored in the silo until it can be disposed of properly.

• Regular maintenance of the ESP and pneumatic conveying system is necessary to ensure efficient de-ashing.

• Proper safety measures must be taken during the de-a
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Q2. What is the capacity of esp hoppers.
Ans. 
The capacity of ESP hoppers varies depending on the size and model of the equipment.
• ESP hoppers can range from a few hundred cubic feet to several thousand cubic feet in capacity.

• The capacity can also depend on the type of material being collected in the hopper.

• It is important to regularly monitor and maintain the hopper to prevent overfilling and potential equipment damage.
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Q1. How to design bearing brackets for hydro generator? How do you decide cross section of arms? What materials do you use? What loads are considered for design?
Ans. 
To design bearing brackets for a hydro generator, the cross section of arms is determined based on load considerations and materials are selected for their strength and corrosion resistance.
• The design of bearing brackets for a hydro generator involves determining the cross section of arms.

• The cross section of arms is decided based on load considerations such as the weight of the rotor, hydraulic forces, and any additio...read more
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Q2. What's the function of stator core? How do you decide clamping force? Number of bolts for clamping? What is material for laminated sheets? Why cold rolled sheets?
Ans. 
The stator core is a crucial component in an electric motor, providing support and magnetic flux. Clamping force, number of bolts, material, and cold rolled sheets are determined based on design requirements.
• The function of the stator core is to support the windings and provide a path for the magnetic flux in an electric motor.

• The clamping force for the stator core is determined based on the mechanical load and the des...read more
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Q3. How do you design shaft of generator? How coupling between shafts is calculated?
Ans. 
The design of a generator shaft involves considering factors such as material selection, stress analysis, and balancing.
• Select appropriate material for the shaft based on factors like strength, corrosion resistance, and cost.

• Perform stress analysis to ensure the shaft can withstand the operating loads and torque.

• Consider factors like shaft diameter, length, and keyway design.

• Balance the shaft to minimize vibrations and...read more
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Q4. What is rotor dynamics? What are the inputs required? What output you get from same?
Ans. 
Rotor dynamics is the study of the behavior and performance of rotating machinery.
• Rotor dynamics involves analyzing the vibrations, stability, and performance of rotating components such as rotors, shafts, and bearings.

• Inputs required for rotor dynamics analysis include rotor geometry, material properties, operating conditions, and boundary conditions.

• The output of rotor dynamics analysis includes critical speeds, mode...read more
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Q1. What is salary expectation
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Q2. Relocation to Vadodara Gujarat
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Q3. General questions about changing job
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Q1. Technical knowledge about autocad and drafting
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Q1. Tell me about yourself.
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Q2. Explain about design and standards for drafting a diagram .
Ans. 
Design and standards for drafting a diagram involve following established guidelines and principles.
• Designing a diagram involves understanding the purpose and audience of the diagram.

• Standards for drafting a diagram include using appropriate symbols, labels, and dimensions.

• Diagrams should be clear, concise, and accurately represent the intended information.

• Following industry-specific standards and conventions is import...read more
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