Hitachi Energy Maintenance Team Lead Interview Questions and Answers

First round is a passed to aptitude test after then you are qualified to a 2nd round.

Second round you passed to group discussion after you qualified to face to face interview.

Q1. Describe the half wave and full wave rectifier
Add your answer
Q2. Working process of cyloconverter
Add your answer

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
Answered by AI
View 1 more answer
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%
Answered by AI
View 1 more answer

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
Answered by AI
Add your answer
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.
Answered by AI
Add your answer

Q1. I will pay you only this.
Add your answer

Q1. Hydraulic. Pneumatic
Add your answer
Q2. Pump. gearbox . Bearings
Add your answer

Question related to electrical and mental ability

Q1. Tell me about your self, what is transformer, Tell me about your BE Project, What is resistance, capacitor, Generator And so on
Add your answer
Q2. What is transformer
Ans. 
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to increase or decrease voltage levels in electrical circuits.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.

• Step-up transformers increase voltage levels, while step-down transformers decrease voltage levels.

• Transf...read more
Answered by AI
Add your answer
Q3. What is resistance
Ans. 
Resistance is the opposition to the flow of electric current.
• Resistance is measured in ohms (Ω).

• It is caused by the collisions of electrons with atoms in a conductor.

• Higher resistance leads to lower current flow.

• Resistance can be affected by factors like material, length, and temperature.

• Examples of high resistance materials include rubber and glass.

• Examples of low resistance materials include copper and silver.
Answered by AI
Add your answer
Q4. What is generator
Ans. 
A generator is a device that converts mechanical energy into electrical energy.
• Generators are commonly used in power plants to generate electricity

• They can also be used as backup power sources in case of power outages

• Generators can be powered by various sources such as gasoline, diesel, natural gas, or renewable energy sources like wind or solar

• They work on the principle of electromagnetic induction
Answered by AI
Add your answer
Q5. What is capacitor
Ans. 
A capacitor is an electronic component that stores and releases electrical energy in a circuit.
• Capacitors are used to filter out noise in electronic circuits.

• They can also be used to store energy in flash cameras.

• Capacitors are measured in farads, with smaller values denoted in microfarads or picofarads.
Answered by AI
Add your answer

Any questions ask my job related

Q1. My job related ask any questions
Add your answer

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
Answered by AI
View 1 more answer
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
Answered by AI
Add your answer