Hitachi Energy Maintenance Team Lead Interview Questions and Answers

Q1. Why we can't more efficiency in Boiler
Ans. 
Efficiency in boilers is limited due to various factors.
• Incomplete combustion of fuel leads to energy loss

• Heat loss through flue gases and radiation

• Inefficient heat transfer due to scaling or fouling

• Improper insulation leading to heat loss

• Inadequate maintenance and tuning

• Lack of advanced control systems

• Design limitations and constraints

• Fuel quality and composition

• Operating conditions and load variations
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Q2. Why Turbine,s efficiency is less & so derive the efficiency equation
Ans. 
The efficiency of a turbine is less due to various factors such as friction, heat losses, and mechanical losses.
• Friction between the moving parts of the turbine reduces its efficiency.

• Heat losses occur due to the conversion of thermal energy into mechanical energy.

• Mechanical losses include losses in bearings, seals, and other components.

• Efficiency equation: Efficiency = (Useful output energy / Input energy) * 100%
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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. I will pay you only this.
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Q1. Hydraulic. Pneumatic
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Q2. Pump. gearbox . Bearings
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Q1. My job related ask any questions
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Q1. What is motor and MCB.
Ans. 
A motor is a device that converts electrical energy into mechanical energy, while MCB stands for Miniature Circuit Breaker used for electrical protection.
• Motor is a machine that converts electrical energy into mechanical energy

• MCB is a Miniature Circuit Breaker used for electrical protection

• Motors are commonly used in various applications such as fans, pumps, and conveyor belts

• MCBs are designed to automatically switch ...read more
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Q2. Define the types of motor divice.
Ans. 
Types of motor devices include AC motors, DC motors, stepper motors, and servo motors.
• AC motors: commonly used in household appliances and industrial applications

• DC motors: used in battery-operated devices and automotive applications

• Stepper motors: used in precision positioning applications

• Servo motors: used in robotics and automation for precise control
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Q1. 1 .Law of thermodynamics, about centrifugal, reciprocating pump,types of boiler
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Q2. Types of Gear, types of valve
Ans. 
There are various types of gears and valves used in maintenance.
• Types of gears include spur, helical, bevel, worm, and planetary gears.

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

• Each type of gear and valve has its own unique characteristics and applications.

• Proper maintenance and lubrication is essential for the longevity and efficiency of gears and valves.
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