Coal India Management Trainee Mining Interview Questions and Answers

A transformer diagram can be drawn from both primary and secondary ends.

• Draw two parallel lines representing the core of the transformer

• Draw two coils around the core, one for primary and one for secondary

• Connect the coils with a dotted line to represent the magnetic field

• Label the primary and secondary coils and indicate the direction of current flow

• Include any additional components such as taps or shields

Crona is not a known term in the context of substations. Please provide more information.

• Crona is not a known term in the context of substations

• It is important to use correct terminology when discussing technical topics

• Preventing issues in substations involves proper maintenance and monitoring

• Examples of issues that can occur in substations include equipment failure and power outages

The efficiency of a power plant is the ratio of output power to input power.

• Efficiency is affected by factors such as fuel type, technology used, and maintenance.

• Higher efficiency means less fuel is needed to produce the same amount of power.

• Efficiency can be improved through upgrades and modifications to the plant.

• Efficiency can be calculated using the formula: Efficiency = (Output Power / Input Power) x 100%

• For examp...read more

Efficiency of transformer is the ratio of output power to input power.

• Efficiency is an important parameter for transformers.

• It is calculated as the ratio of output power to input power.

• Efficiency is always less than 100% due to losses in the transformer.

• Transformers with higher efficiency are preferred as they waste less energy.

• Efficiency can be improved by using better materials and design.

• For example, a transformer w...read more

Different types of transmission wires are used in transmission made of different metals for their specific properties.

• Copper wires are commonly used for their high conductivity.

• Aluminum wires are used for long-distance transmission due to their lightweight.

• Steel-cored aluminum wires are used for their strength and conductivity.

• Aerial bundled cables are used for their insulation properties.

• Different metals are used base...read more

The height of a tower carrying 132kv depends on various factors such as terrain, weather, and distance between towers.

• The height of the tower is determined by the voltage it carries and the distance between towers.

• The terrain and weather conditions also play a role in determining the height of the tower.

• The height of the tower can range from 15 meters to over 50 meters depending on the above factors.

• For example, in hil...read more

CT and PT can be differentiated visually in substation by their size, shape, and labeling.

• CTs are typically larger and cylindrical in shape, while PTs are smaller and more rectangular.

• CTs are often labeled with a ratio, such as 100:5, while PTs are labeled with a voltage rating.

• CTs are usually located on the high voltage side of the substation, while PTs are on the low voltage side.

• CTs are used to measure current, whil

Single phase induction motor works on the principle of electromagnetic induction.

• It has a stator and a rotor.

• The stator has a single phase winding which produces a magnetic field.

• The rotor is either squirrel cage or wound type.

• When AC supply is given to the stator winding, it produces a magnetic field which induces a current in the rotor.

• This current produces a magnetic field in the rotor which interacts with the stato...read more

Yes, I organized a technical fest in college as the head coordinator.

• Planned and executed the entire event with a team of 20 members

• Managed a budget of INR 5 lakhs and ensured timely payments to vendors

• Coordinated with sponsors and invited industry experts as guest speakers

• Handled logistics, marketing, and publicity of the event

• Received positive feedback from participants and faculty members

ISTE is a national professional society for educators and students in engineering and technology fields.

• ISTE stands for Indian Society for Technical Education

• It is a non-profit organization that aims to improve technical education in India

• As the chairman of Durgapur Chapter, I organized various workshops and seminars for students and faculty members

• I also encouraged students to participate in technical competitions and...read more

I would approach the workman and explain the importance of safety rules and PPE, and offer assistance if needed.

• Approach the workman in a calm and respectful manner

• Explain the safety rules and the importance of following them

• Demonstrate the proper use of PPE and offer assistance if needed

• Provide incentives for compliance, such as rewards or recognition

• Document any incidents or non-compliance for future reference

No, I am open to working in remote locations in India.

• I am willing to explore new places and cultures.

• I understand that remote locations may offer unique challenges, but I am up for the task.

• I am excited about the opportunity to contribute to the company's growth and success, regardless of the location.

• I am adaptable and can adjust to new environments quickly.

• I believe that working in a remote location will provide me ...read more

I am a recent graduate with a degree in Mechanical Engineering, passionate about problem-solving and eager to learn and grow in the field.

• Recent graduate with a degree in Mechanical Engineering

• Passionate about problem-solving

• Eager to learn and grow in the field

I am a recent graduate with a degree in Mechanical Engineering and a passion for problem-solving and innovation.

• Graduated with a degree in Mechanical Engineering

• Passionate about problem-solving and innovation

• Completed internships at XYZ Company and ABC Company

• Proficient in CAD software such as SolidWorks

• Strong communication and teamwork skills

Passion for exploring underground resources and contributing to sustainable development.

• Fascination with geology and earth sciences

• Desire to work in challenging and dynamic environments

• Interest in contributing to sustainable resource management

• Opportunity to work with advanced technology and machinery

• Passion for exploring underground resources

I watch movies regularly as a form of entertainment and relaxation.

• I enjoy watching a variety of genres such as action, comedy, and drama.

• I usually watch movies on weekends or during my free time.

• I like to stay updated on new releases and popular films.

• Watching movies helps me unwind and escape from daily stress.

• Some of my favorite movies include The Shawshank Redemption, Inception, and The Dark Knight.

Living in a residential campus during school and +2 has helped me develop independence, time management skills, and strong bonds with peers.

• Developed independence by managing daily tasks without parental supervision

• Learned time management skills by balancing academics, extracurricular activities, and personal time

• Formed strong bonds with peers through shared experiences and living in close proximity

• Exposure to diverse ...read more

Yes, diamonds can be found in coal mines.

• Diamonds are formed deep within the Earth's mantle under high pressure and temperature.

• Volcanic eruptions bring diamonds closer to the surface.

• Coal is formed from ancient plant material that has undergone heat and pressure over millions of years.

• Sometimes, diamonds can get trapped within coal deposits.

• Mining operations that extract coal can occasionally uncover diamonds as well.

Kimberlite is a type of igneous rock that is known for containing diamonds.

• Kimberlite is formed deep within the Earth's mantle and is brought to the surface through volcanic eruptions.

• It is often associated with diamond-bearing deposits and is therefore of great interest to the diamond mining industry.

• Kimberlite rocks are typically blue-gray in color and have a porphyritic texture.

• Other rocks ending with 'lite' include...read more

Mohr's Scale is a graphical representation of stress and strain relationships in materials.

• Mohr's Scale is used in the field of mechanics to analyze the behavior of materials under different loading conditions.

• It plots the stress on the x-axis and the corresponding strain on the y-axis.

• The scale helps in determining the elastic and plastic behavior of materials.

• By analyzing the plotted points, one can determine the mat...read more

Tectonic plates are large, rigid pieces of the Earth's lithosphere that fit together like a jigsaw puzzle.

• Tectonic plates are sections of the Earth's crust and upper mantle.

• There are seven major tectonic plates and several smaller ones.

• These plates float on the semi-fluid asthenosphere beneath them.

• The movement of tectonic plates causes earthquakes, volcanic activity, and the formation of mountains.

• Examples of tectonic...read more

Materials like Gypsum and Diamond are used as reference in Mohr's scale because they have well-defined hardness values.

• Mohr's scale is a qualitative scale that ranks minerals based on their relative hardness.

• Gypsum is assigned a hardness value of 2 on the scale, while diamond is assigned a hardness value of 10.

• Using materials like Gypsum and Diamond as reference points allows for easy comparison and classification of o...read more