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Coal India Interview Questions and Answers for Freshers
14 Interview questions
Substation use equipment refers to the various devices and tools used in a substation for power distribution and maintenance.
Substation transformers
Circuit breakers
Disconnect switches
Voltage regulators
Capacitor banks
Protective relays
Electricity is the flow of electric charge through a conductor.
Electricity is the flow of electrons through a conductor
It is a form of energy that powers electrical devices
Electricity can be generated from various sources such as coal, wind, solar, and hydro
It is measured in units of volts, amps, and watts
Transformers function to change voltage levels in electrical systems.
Transformers increase or decrease voltage levels in electrical systems
Step-up transformers increase voltage for long-distance transmission
Step-down transformers decrease voltage for distribution to homes and businesses
Transformers help maintain power quality and efficiency in electrical grids
Portable machines can be easily carried around, while transportable machines require disassembly and reassembly for transportation.
Portable machines are designed to be easily moved from one location to another without much effort.
Transportable machines require disassembly and reassembly for transportation.
Portable machines are usually smaller and lighter than transportable machines.
Examples of portable machines in...
The calorific value of coal varies depending on the type of coal, but typically ranges from 24 to 30 megajoules per kilogram.
Calorific value is the amount of heat released when a substance is burned.
It is measured in units of energy per unit of mass, such as joules per gram or megajoules per kilogram.
The calorific value of coal can vary depending on factors such as moisture content, ash content, and sulfur content...
Safety devices of Direct Haulage include emergency stop buttons, warning signals, and safety barriers.
Emergency stop buttons are installed at regular intervals along the haulage route.
Warning signals such as flashing lights and alarms are used to alert workers of approaching haulage equipment.
Safety barriers are used to prevent workers from entering hazardous areas.
Proximity detection systems are used to detect th...
Sharp corners are avoided in casting to prevent stress concentration and improve the overall strength and quality of the casting.
Sharp corners can lead to stress concentration, which can cause cracks or failure in the casting.
Rounded corners distribute stress more evenly, reducing the likelihood of defects.
Sharp corners can also create difficulties during the casting process, such as mold filling and solidificatio...
Latency refers to the delay before a transfer of data begins following an instruction for its transfer.
Latency is crucial in network performance; lower latency means faster response times.
In gaming, high latency can lead to lag, affecting user experience.
In medical imaging, latency can affect the speed of diagnosis.
Examples include network latency (time taken for data to travel) and input latency (delay between us...
A weep hole is a small opening that allows water to escape from a structure, preventing moisture buildup and damage.
Weep holes are commonly found in brick walls to allow trapped moisture to escape.
They help prevent water damage and mold growth by promoting drainage.
In retaining walls, weep holes allow groundwater to exit, reducing pressure on the wall.
Weep holes are often placed at the bottom of walls or structure...
A haul road is a road used for transporting materials, typically in a mining or construction site.
Haul roads are designed to handle heavy loads and are often unpaved.
They are used to transport materials such as ore, rock, and dirt.
Haul roads must be maintained regularly to ensure safety and efficiency.
Proper drainage is important to prevent erosion and maintain road stability.
Examples of haul road equipment includ...
Coal India Interview Experiences for Freshers
16 interviews found
Anonymous
(5 Questions)
- Q1. What is substation use equipment
- Ans.
Substation use equipment refers to the various devices and tools used in a substation for power distribution and maintenance.
Substation transformers
Circuit breakers
Disconnect switches
Voltage regulators
Capacitor banks
Protective relays
- Q2. What is electricity
- Ans.
Electricity is the flow of electric charge through a conductor.
Electricity is the flow of electrons through a conductor
It is a form of energy that powers electrical devices
Electricity can be generated from various sources such as coal, wind, solar, and hydro
It is measured in units of volts, amps, and watts
- Q3. What is induction motor and functions
- Ans.
An induction motor is a type of AC motor that works on the principle of electromagnetic induction to convert electrical energy into mechanical energy.
Induction motors are commonly used in various industrial applications due to their simplicity, reliability, and low cost.
They consist of a stator (stationary part) and a rotor (rotating part) where the rotor is not connected to an external power source.
When an alternating...
- Q4. What is generator and functions
- Ans.
A generator is a device that converts mechanical energy into electrical energy. It functions by rotating a coil of wire within a magnetic field to produce electricity.
Generates electricity by converting mechanical energy into electrical energy
Consists of a coil of wire rotating within a magnetic field
Used in power plants, backup generators, and portable generators
- Q5. What is Transformers this function
- Ans.
Transformers function to change voltage levels in electrical systems.
Transformers increase or decrease voltage levels in electrical systems
Step-up transformers increase voltage for long-distance transmission
Step-down transformers decrease voltage for distribution to homes and businesses
Transformers help maintain power quality and efficiency in electrical grids
Selected
I applied via Newspaper Ad and was interviewed before Jan 2022. There were 2 interview rounds.
(2 Questions)
- Q1. Related to medical field. Treatment given in TB. Working environment
- Q2. Treatment given in TB
- Ans. Treatment in case of coal mining injury
Interview Preparation Tips
- Any current topic
Be Allert and confident in replying
Dress your self properly on the day of interview
I applied via employment news and was interviewed before Feb 2021. There was 1 interview round.
(2 Questions)
- Q1. Calculate power factor in single phase and 3-phase circuits and what precaution to take to improve power factor.
- Q2. Only technical, what is power factor in 3-phase circuits.
Interview Preparation Tips
- Technical Skills
- GK
- aptitude
- reasoning
I applied via Campus Placement and was interviewed before Apr 2020. There were 3 interview rounds.
Interview Questionnaire
4 Questions
- Q1. 1) What are the Safety devices of Direct Haulage?
- Ans.
Safety devices of Direct Haulage include emergency stop buttons, warning signals, and safety barriers.
Emergency stop buttons are installed at regular intervals along the haulage route.
Warning signals such as flashing lights and alarms are used to alert workers of approaching haulage equipment.
Safety barriers are used to prevent workers from entering hazardous areas.
Proximity detection systems are used to detect the pre...
- Q2. 2) What is the Calorific Value of Coal?
- Ans.
The calorific value of coal varies depending on the type of coal, but typically ranges from 24 to 30 megajoules per kilogram.
Calorific value is the amount of heat released when a substance is burned.
It is measured in units of energy per unit of mass, such as joules per gram or megajoules per kilogram.
The calorific value of coal can vary depending on factors such as moisture content, ash content, and sulfur content.
For ...
- Q3. Where is Triveni Sangam?
- Q4. 3) What is the difference between Portable and Transportable Machines?
- Ans.
Portable machines can be easily carried around, while transportable machines require disassembly and reassembly for transportation.
Portable machines are designed to be easily moved from one location to another without much effort.
Transportable machines require disassembly and reassembly for transportation.
Portable machines are usually smaller and lighter than transportable machines.
Examples of portable machines include...
Interview Preparation Tips
I applied via Newspaper Ad and was interviewed before May 2021. There was 1 interview round.
(1 Question)
- Q1. Basic Mechanical Engg Question. The interview lasted only 15 mins.
Interview Preparation Tips
GRIRAJ PRASHAD MEENA
Interview Questionnaire
4 Questions
- Q1. TEll me about yourself?
- Ans.
I am a highly motivated individual with a passion for learning and growth.
I have a Bachelor's degree in Business Administration
I have completed several internships in the field of marketing and sales
I am a quick learner and enjoy taking on new challenges
I am a team player and enjoy collaborating with others to achieve common goals
- Q2. Question related to subject?
- Q3. Tell me about haul road?
- Ans.
A haul road is a road used for transporting materials, typically in a mining or construction site.
Haul roads are designed to handle heavy loads and are often unpaved.
They are used to transport materials such as ore, rock, and dirt.
Haul roads must be maintained regularly to ensure safety and efficiency.
Proper drainage is important to prevent erosion and maintain road stability.
Examples of haul road equipment include hau...
- Q4. What is flame safety lamp?
- Ans.
A flame safety lamp is a type of lamp used in mining to detect methane gas and prevent explosions.
It works by creating a flame inside a mesh screen that will go out if methane is present.
The lamp was invented by Sir Humphry Davy in 1815.
It was widely used in coal mines in the 19th and early 20th centuries.
Today, electronic gas detectors have largely replaced flame safety lamps in mining.
Interview Preparation Tips
Experience: i spoken in hindi.I only spoken selected topic related to the topic.i totally concentrated to interviewer and fellows.
Tips: Be cooll,speak frankly
Round: Technical Interview
Experience: 1.I told about me and my graduation and hobbies.Also about my achievements.2.I asked about minerals in rajasthan. I answered very well like lignite,cu,zn,pb,marbels.3.I answered it is generally gradient is 1in14 and stability is very important and its floor is hard.4. i answered that it it used in detection of O2 and CH4. then they said OK.you can leave.
Tips: Be confident
College Name: IIT DHANBAD
Interview Questionnaire
2 Questions
- Q1. Your favorite subject and questions about that
- Q2. 'Why this company?'
- Ans.
I am impressed with the company's commitment to innovation and employee development.
The company has a reputation for investing in its employees through training and development programs.
I am excited about the company's focus on innovation and staying ahead of industry trends.
The company's mission and values align with my own personal and professional goals.
I have researched the company and have been impressed with its ...
Interview Preparation Tips
Experience: Initially there was a GD. Civil had two groups. Everybody got a chance to speak once. In the end anyone could volunteer to summarize the discussion. Topic of my GD was: 'While planning the township for Coal India employees at a mine site what all information is required?' Few students got shortlisted for the personal Interview which was the next round.
Round: Other Interview
Experience: We also had a document verification where they checked our X, XII and semester mark sheets. The only extracurricular certificate they accepted was of NCC. Personal Interview was for approximately 20 mins. In the interview they would ask you your favorite subject and question you about that. So it is best to prepare that subject well and go. For e.g. if you say concrete technology then they will ask questions like what are the tests for fresh concrete, hardened concrete, tests for aggregates etc. They will also ask for specifics like slump value of pumpable concrete.
General Tips: It was a challenging experience. I didn't expect to get selected. Keeping calm is the key. I had given many interviews for different companies. Giving sensible/intelligent answers is critical. Giving haphazard answers gives a wrong impression. Do not have expectations from any company.
Skill Tips: If you are going for a company prepare the question 'Why this company?' well. Coal India employers want to make sure that you will stay with them. They had asked me this question along with a lot information about the company such as What are Coal India's subsidiaries? Where are they located? In how many years does one get promoted from E1 grade to higher grades? Find out more about the company well before going and if possible speak to alumni working there well in advance.
College Name: NIT SURATHKAL
I applied via Other and was interviewed before Jul 2017. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Why sharp corners are avoided in casting?
- Ans.
Sharp corners are avoided in casting to prevent stress concentration and improve the overall strength and quality of the casting.
Sharp corners can lead to stress concentration, which can cause cracks or failure in the casting.
Rounded corners distribute stress more evenly, reducing the likelihood of defects.
Sharp corners can also create difficulties during the casting process, such as mold filling and solidification iss...
Interview Preparation Tips
Skills: Technical Questions, Technical Questions, Presentation Skills
Duration: 1-3 Months
Interview Preparation Tips
Experience: Most of the questions were related to coal geology and structural geology like coal grades, deposits in India, their main use, i.e. whether coking or non-coking grade and sedimentology.
Tips: Don’t hesitate to speak anything. Be brief and to the point. Good analytical ability and of course oratory ability is required
Round: Interview
Experience: Geological as well as some HR related questions can be asked.
Tips: Be confident and if you don’t know an answer do not beat around the bush.
General Tips: For written test R S Agarwaal aptitude and reasoning is sufficient. For Technical, whatever is studied in curriculum is sufficient. Also project and internship parts should be well known. At last One thing one should keep in mind that one has to sell oneself so do whatever you think can describe yourself and that will be beneficial for your customer(company). All the best for all the participants from my heart and soul.
Skill Tips: CGPA as well as results in secondary and senior secondary levels matter. Government companies do not prefer candidates who have gaps in their academic career. Not necessary for students in Geology but good field knowledge and intepretation capability of structural maps do play an important role in the selection process. A bit of knowledge about the industrial scenario is required. Many of the students could not even define ‘dip’ and ‘strike’. So I think a solid base in structural geology is required to join a mining company.
College Name: IIT KHARAGPUR
Interview Preparation Tips
Experience: They shortlisted some 40 students based on their CGPA in the respective categories, after coming to campus there was a GD out of which some 17 people got selected.
Round: Other Interview
Experience: Then there was a Personal interview and 10 got selected at the end.
General Tips: It was a wonderful experience knowing half of the things not knowing quite some of them and finally getting selected. One thing I knew I did not fake around with any of the question. Guys Never feel bad if not selected, because it is not destined for you. there is something better waiting for you.
Skill Tips: No extra preparation required just the normal notes of class and wherever doubt existed got it cleared from NPTEL videos they were really helpful.Be confident in whatever you know. Don't take any tension about whatever you don't know as you cannot change anything regarding that. Never beat around the bush. Be straight forward. Always go with a smile come back with a smile and be Confident. Confidence matters a lot.
College Name: NIT SURATHKAL
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Coal India Interview FAQs
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