Coal India Dumper Operator Interview Questions and Answers

Q1. Puzzle of ball. How to figure odd one out
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Q2. Your aspiration likes dislikes
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Q1. About yourself and carrier path till date
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Q1. Related with your background
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Q2. Mining related questions
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Q1. Salary related questions
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Q1. Rope dia calculation for given capacity of overhead crane.
Ans. 
Calculate rope diameter based on overhead crane capacity
• Calculate the weight of the load the crane will be lifting

• Determine the maximum load capacity of the crane

• Use the formula: Rope diameter = (Load weight / (2 * Safe working load * Safety factor * π))^0.5

• For example, if the load weight is 10 tons, safe working load is 5 tons, and safety factor is 2, the rope diameter would be calculated as: (10000 / (2 * 5 * 2 * 3.1
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Q2. Centrifugal pump efficiency curves
Ans. 
Centrifugal pump efficiency curves show the relationship between flow rate and efficiency of the pump.
• Efficiency curves help in selecting the right pump for a specific application

• They provide information on the pump's performance at different operating points

• Efficiency curves typically have a peak efficiency point and a best efficiency point (BEP)

• Understanding these curves can help in optimizing pump performance and en
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Q3. Cost of solenoid valve and servo.
Ans. 
The cost of solenoid valves and servos can vary depending on the brand, size, and quality.
• Cost of solenoid valves can range from $10 to $1000+ depending on size and brand.

• Servos can cost anywhere from $20 to $500+ depending on torque and brand.

• Higher quality solenoid valves and servos may have a higher price tag.

• Consider factors like durability, performance, and warranty when comparing costs.
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Q1. Compensating salary by giving 2 jump on post
Ans. But I didn't accepted their condition and said NO for job. Finally they agreed and at present I am working here.
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Q1. Skill set related questions
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Q2. Business related knowledge
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If your knowledge is good then skip it but in 90% cases it's mandatory

Q1. Advance technical
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Q2. Deep understanding of business and are related questions
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Q1. Normal talk with manager
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Q2. Last round with hr
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Q1. Vast knowledge of respective field experience with specific suppliers details and IS codes and current market rates of executed items
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Test for various reactions on different site conditions

Online test assignments

Q1. Negiotiation and designation discussion
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Q1. Details of power station design
Ans. 
Power station design involves the planning and construction of facilities that generate electricity.
• Design includes selection of appropriate technology and equipment

• Consideration of environmental impact and safety measures

• Layout and construction of buildings and infrastructure

• Integration with power grid and transmission systems

• Examples include thermal power plants, hydroelectric power plants, and wind farms
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Q2. Efficiency of Power station
Ans. 
Efficiency of a power station is the ratio of output power to input power.
• Efficiency can be improved by using advanced technologies and equipment.

• Regular maintenance and cleaning of equipment can also improve efficiency.

• Efficiency can be affected by factors such as fuel quality, weather conditions, and demand for electricity.

• For example, a power station using combined cycle technology can achieve an efficiency of up to...read more
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Q1. Explain GTG Operation and load sharing
Ans. 
GTG operation involves multiple generators working together to share the load and ensure continuous power supply.
• GTG stands for Gas Turbine Generator

• In GTG operation, multiple generators are synchronized to work together

• Load sharing ensures that the power demand is distributed evenly among the generators

• This helps in maintaining a stable power supply and prevents overloading of any single generator
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