40+ NMDC Limited Interview Questions and Answers

NMDC is a public sector enterprise in India that is involved in the exploration and production of minerals.

• NMDC stands for National Mineral Development Corporation

• It was founded in 1958 and is headquartered in Hyderabad, India

• The company is primarily involved in the mining of iron ore and has operations in several states in India

• NMDC is one of the largest iron ore producers in India and has been awarded the prestigious Navratna status by the Indian government

Common risks at NMDC include market volatility, regulatory changes, and operational risks. These can be faced through risk management strategies.

• Market volatility can be managed through diversification of products and markets.

• Regulatory changes can be monitored and responded to through compliance measures.

• Operational risks can be mitigated through proper training and safety protocols.

• Financial risks can be managed through effective financial planning and management.

• Environmen...read more

Inverse-time is a protection scheme used in electrical systems to provide selective coordination and faster fault detection.

• Inverse-time protection is based on the principle that the time taken for a protective device to operate is inversely proportional to the magnitude of the fault current.

• It allows for selective coordination, where the protective devices closest to the fault operate faster than those further away.

• Inverse-time curves are used to determine the operating time...read more

Armature reaction is the effect of magnetic field produced by armature current on the main magnetic field of a DC machine.

• It is caused by the interaction of armature current and main magnetic field.

• It distorts the main magnetic field and shifts the neutral plane.

• It affects the commutation process and can cause sparking.

• Compensating windings are used to counteract armature reaction.

• It is more pronounced in DC machines with high armature current.

• Armature reaction can be minimiz...read more

No, an induction motor cannot be called a transformer.

• An induction motor converts electrical energy into mechanical energy, while a transformer only changes the voltage level of an AC power supply.

• A transformer has two windings, while an induction motor has a rotor and a stator.

• Transformers are used to step up or step down voltage levels, while induction motors are used to drive mechanical loads.

• Induction motors have a rotating magnetic field, while transformers do not.

• Exampl...read more

Anticipated problems in various situations

• During a project, I anticipated potential delays due to a team member's absence and created a contingency plan

• In customer service, I anticipated a high volume of calls during a holiday weekend and scheduled extra staff

• In event planning, I anticipated bad weather and arranged for indoor backup options

• In financial analysis, I anticipated a decrease in revenue and created a plan to cut costs

• In software development, I anticipated bugs and...read more

The optimal equipment for running depends on individual preferences and needs.

• Running shoes with proper support and cushioning are essential

• Comfortable and breathable clothing is recommended

• Some runners prefer using wearable technology such as fitness trackers or smartwatches

• Hydration packs or belts can be useful for longer runs

• Treadmills or elliptical machines can be used for indoor running

• Resistance bands or weights can be used for strength training

• Foam rollers or massage b...read more

Yes, it was my first choice.

• I have always been interested in how things work and how to improve them.

• I excelled in math and science in high school, which led me to pursue electrical engineering.

• I have found the field to be challenging and rewarding, and I am passionate about it.

• I have had the opportunity to work on exciting projects, such as designing a new power grid system for a city.

• Overall, I am very happy with my choice to pursue electrical engineering.

The question covers various topics related to pumps, valves, and chemical properties.

• pH is a measure of acidity or alkalinity of a solution.

• Tar density is the mass of tar per unit volume of a substance.

• Tar production process involves heating organic materials in the absence of air.

• Types of pumps include centrifugal, positive displacement, and axial flow pumps.

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

• NRV stands for Non-Return Valve, which allows fluid to flo...read more

Weight adjustment of a Load cell controller involves calibrating the controller to accurately measure weight.

• Calibrate the load cell controller using known weights to ensure accurate measurements.

• Adjust the zero balance to account for any offset in the readings.

• Perform span adjustment to set the maximum weight range the controller can measure.

• Verify the accuracy of the adjustments by testing with different weights.

• Repeat the calibration process periodically to maintain accura...read more

An induction motor is an AC electric motor in which the electric current in the rotor is produced by electromagnetic induction from the magnetic field of the stator winding.

• Induction motors are widely used in industrial applications due to their simplicity, reliability, and low cost.

• They work on the principle of electromagnetic induction, where a rotating magnetic field is produced in the stator winding, which induces a current in the rotor winding.

• The rotor of an induction m...read more

Turbo generators and hydro generators are types of electrical generators used to convert mechanical energy into electrical energy.

• Turbo generators are used in thermal power plants and gas turbine power plants.

• Hydro generators are used in hydroelectric power plants.

• Turbo generators use steam to rotate the turbine and generate electricity.

• Hydro generators use the force of falling water to rotate the turbine and generate electricity.

• Both types of generators are commonly used in ...read more

I can contribute my expertise in project management and my ability to work collaboratively with teams to achieve goals.

• Expertise in project management

• Collaborative team player

• Ability to achieve goals

• Experience in the industry

• Innovative problem solver

Power system is a network of electrical components used to generate, transmit, and distribute electricity.

• Power system is responsible for generating electrical energy from various sources such as coal, natural gas, hydro, wind, and solar.

• It includes power plants, transformers, transmission lines, substations, and distribution networks.

• Power generation involves converting mechanical energy into electrical energy through generators.

• Transmission lines carry high voltage electric...read more

Practical handling of mine working, ore sorting, drilling and blasting involves knowledge of safety protocols, equipment operation, and efficient techniques.

• Ensure safety protocols are followed at all times

• Operate equipment such as excavators, bulldozers, and drills

• Use efficient techniques for ore sorting and blasting

• Monitor and maintain equipment to ensure optimal performance

• Collaborate with team members to achieve production targets

Maxwell's laws of electromagnetics describe the behavior of electric and magnetic fields.

• Maxwell's first law states that the total electric flux through a closed surface is equal to the net charge enclosed by that surface divided by the permittivity of free space.

• Maxwell's second law states that the magnetic field lines do not have any sources or sinks, and any magnetic field line that forms a closed loop must pass through a current-carrying wire.

• Maxwell's third law states th...read more

Some theorems in DSP are Nyquist-Shannon sampling theorem, Parseval's theorem, and Convolution theorem.

• Nyquist-Shannon sampling theorem states that a signal can be perfectly reconstructed if it is sampled at a rate greater than twice its highest frequency component.

• Parseval's theorem relates the energy of a signal in the time domain to its energy in the frequency domain.

• Convolution theorem states that convolution in the time domain corresponds to multiplication in the frequen...read more

A mineral is a naturally occurring inorganic solid with a specific chemical composition and crystal structure. An ore is a rock that contains a valuable mineral or metal.

• Minerals are formed through geological processes and have a defined chemical composition.

• They have a crystalline structure and can be identified by their physical properties.

• Ores are rocks that contain economically valuable minerals or metals.

• They are mined and processed to extract the valuable materials.

• Exam...read more

Digital signal processing is the use of mathematical algorithms to manipulate and analyze digital signals.

• It involves converting analog signals into digital signals

• It can be used in audio and image processing

• It is used in various applications such as noise reduction, compression, and filtering

• Examples include MP3 audio compression and JPEG image compression

M in M20 refers to the mix ratio of concrete, where M stands for mix and 20 represents the compressive strength of concrete in megapascals (MPa).

• M20 is a commonly used grade of concrete in construction.

• The mix ratio for M20 concrete is 1:1.5:3, which means 1 part cement, 1.5 parts sand, and 3 parts aggregate by volume.

• The compressive strength of M20 concrete is expected to be 20 MPa after 28 days of curing.

• Different grades of concrete have different mix ratios and compressive...read more

Calibrating AMLC on 15 plant involves ensuring accurate measurements and adjustments for optimal performance.

• Ensure all 15 plants are properly set up and functioning correctly before calibration.

• Use calibration equipment such as sensors, meters, and software to adjust AMLC settings.

• Perform calibration tests on each plant individually to ensure accuracy and consistency.

• Document calibration results and make necessary adjustments to meet desired specifications.

• Regularly monitor ...read more

Phasor diagram of transformer shows the relationship between voltage, current, and phase angle.

• The primary and secondary voltage phasors are drawn perpendicular to each other.

• The primary and secondary current phasors are also drawn perpendicular to each other.

• The phase angle between the primary voltage and current phasors is the same as the phase angle between the secondary voltage and current phasors.

• The transformer turns ratio determines the length of the voltage and curren...read more

Good customer service involves meeting customer needs and expectations with a positive attitude and effective communication.

• Promptly addressing customer inquiries and concerns

• Providing accurate and helpful information

• Being courteous and respectful

• Going above and beyond to exceed customer expectations

• Following up to ensure customer satisfaction

Atmospheric pressure is the force per unit area exerted on a surface by the weight of the air above that surface.

• Atmospheric pressure decreases with increasing altitude

• Standard atmospheric pressure at sea level is around 1013.25 millibars or 29.92 inches of mercury

• Atmospheric pressure is measured using barometers

Qmap is used for quality mapping in software testing.

• Qmap helps in identifying areas of improvement in software quality.

• It provides a visual representation of quality metrics.

• Qmap can be used to track defects and their resolution.

• It helps in analyzing the effectiveness of testing strategies.

Water analysis parameters include physical, chemical, and biological characteristics.

• Physical parameters include temperature, color, turbidity, and odor.

• Chemical parameters include pH, dissolved oxygen, total dissolved solids, and nutrients.

• Biological parameters include coliform bacteria, algae, and other microorganisms.

• Water analysis is important for ensuring safe drinking water and monitoring environmental impacts.

• Examples of water analysis tests include the EPA's Safe Drin...read more

Ore is a naturally occurring material from which a metal or valuable mineral can be extracted.

• There are various types of ores such as metallic ores, non-metallic ores, ferrous ores, and non-ferrous ores.

• Metallic ores contain metal in raw form such as iron ore, copper ore, and gold ore.

• Non-metallic ores do not contain any metal such as limestone, gypsum, and quartz.

• Ferrous ores contain iron such as hematite and magnetite.

• Non-ferrous ores do not contain iron such as bauxite, ti...read more

The types and grades of ores in a mining operation are determined by their composition and quality.

• Ores can be classified into various types based on their mineral composition, such as iron ore, copper ore, gold ore, etc.

• The grade of an ore refers to the concentration of valuable minerals or metals in the ore, usually expressed as a percentage.

• Different types of ores can have different grades, for example, high-grade iron ore may have a concentration of 60% or more iron.

• The t...read more

Dumpers have various safety features to prevent accidents and ensure safe operation.

• Dumpers have roll-over protection systems (ROPS) to prevent the vehicle from tipping over.

• They also have seat belts and enclosed cabins to protect the driver in case of an accident.

• Dumpers have warning alarms and lights to alert workers of their movement.

• Some dumpers have automatic braking systems to prevent collisions.

• Dumpers have emergency stop buttons to immediately stop the vehicle in case...read more