Jindal Power Junior Mining Engineer Interview Questions and Answers

Q1. Dol and star delta wiring scheme
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DOL (Direct-On-Line) and star delta are two different wiring schemes used in electrical engineering for starting induction motors.
• DOL wiring directly connects the motor to the power supply for starting, while star delta wiring initially starts the motor in star configuration and then switches to delta configuration for running.

• DOL wiring is simpler and cheaper but causes high starting current, while star delta wiring r...read more
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Q1. Mines blasting regarding
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Q2. Working related question for ocp mining
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Q1. I am working from Grid sub station . Transformer... CT PT CVT EARTHING PTW
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Q2. All about 132 kv Gss
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Q1. Suitable banch height for 2cu.m shovel is
Ans. 
The suitable bench height for a 2cu.m shovel depends on various factors such as the type of material being mined and the equipment used.
• The bench height should be determined based on the reach and capacity of the shovel.

• It should allow for efficient loading and dumping of material.

• The bench height should also consider the stability and safety of the mining operation.

• Factors like the type of material, equipment limitati...read more
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Q2. The max width of the gallery in Indian coal mines is
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The maximum width of the gallery in Indian coal mines varies depending on the specific mine and its regulations.
• The maximum width of the gallery is determined by safety regulations and guidelines set by the Indian government.

• Different coal mines may have different maximum width requirements based on factors such as the type of coal being mined, the depth of the mine, and the mining method used.

• For example, in undergrou...read more
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Q3. The max length of the trailing cable is
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The maximum length of the trailing cable depends on various factors such as power requirements, voltage drop, and safety regulations.
• The length of the trailing cable is determined by the distance between the power source and the equipment it needs to supply.

• Power requirements of the equipment play a role in determining the maximum length of the cable.

• Voltage drop, which can affect the efficiency of power transmission, ...read more
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Q4. Detonating fuse consist core of
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Detonating fuse consists of a core
• The core of a detonating fuse is the central part that initiates the explosion

• The core is typically made of a highly reactive material, such as a mixture of powdered metals or chemicals

• The core is surrounded by a protective casing to prevent accidental ignition

• Examples of core materials include lead azide, mercury fulminate, or PETN
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Q5. The VOD of detonating fuse is
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The VOD of detonating fuse is the velocity at which the detonation wave travels along the fuse.
• VOD stands for Velocity of Detonation.

• It is a measure of how fast the detonation wave propagates through the fuse.

• The VOD of a detonating fuse depends on factors such as the type of explosive used and the composition of the fuse.

• A higher VOD means the detonation wave travels faster, resulting in a quicker explosion.

• Different ...read more
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Q6. Safety fuse consist core of
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Q7. In the detonator the priming charge is
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The priming charge in a detonator is the initial explosive charge that initiates the main explosive charge.
• The priming charge is a small amount of explosive material that is sensitive to heat, shock, or friction.

• It is designed to ignite quickly and reliably to initiate the main explosive charge.

• The priming charge is usually contained within a small metal or plastic capsule.

• Examples of priming charges include lead azide...read more
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Q8. Sheathed explosive coated with a sheath of
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A sheathed explosive is coated with a protective covering.
• The sheath provides a layer of protection to the explosive material.

• The sheath can be made of materials like plastic or rubber.

• The purpose of the sheath is to prevent accidental ignition or detonation.

• Examples of sheathed explosives include dynamite and blasting caps.
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Q9. The ANFO the water content should not be more than
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Q10. The gelling agent in slurry explosive is
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The gelling agent in slurry explosive is typically a mixture of water and a thickening agent.
• The gelling agent is used to increase the viscosity of the explosive mixture.

• Common thickening agents used in slurry explosives include guar gum, carboxymethyl cellulose (CMC), and xanthan gum.

• The gelling agent helps to suspend solid particles in the explosive mixture, allowing for better distribution and control of the explosi...read more
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Q11. The VOD of emulsion explosive is
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The VOD of emulsion explosive refers to its Velocity of Detonation.
• VOD is a measure of how fast the explosive reaction propagates through the material.

• It is an important characteristic for determining the efficiency and safety of explosive materials.

• Higher VOD explosives are typically used for blasting hard rock formations.

• Lower VOD explosives are used in situations where a controlled and less destructive explosion is
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Q12. The shovel can dig below ground upto
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Q13. The output capacity of the dragline with 4.5 to 7.5 cu.m is million cu.mper year
Ans. 
The output capacity of the dragline with 4.5 to 7.5 cu.m is in million cu.m per year.
• The output capacity of the dragline depends on the size of the bucket it uses.

• A larger bucket size allows for a higher output capacity.

• The dragline's efficiency and operating conditions also affect its output capacity.

• The output capacity can be calculated by considering the average number of cycles per hour and the bucket fill factor.

• F...read more
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Q1. Generator Protection
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Q2. Daily Maintenance Procedure
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Daily maintenance procedures for electrical engineers ensure optimal performance and safety of electrical systems.
• Inspecting and testing electrical equipment for any signs of wear or damage

• Cleaning and lubricating moving parts to prevent friction and overheating

• Checking and replacing faulty components such as fuses or circuit breakers

• Calibrating sensors and meters to ensure accurate readings

• Updating software and firmwa...read more
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Q1. Safety Protocols
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Q2. Technical Knowledge
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Q1. Salary Discussion
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Q2. Roles and Responsibilities
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Paper was of medium range

Q1. Tell something about u and why u choose this as carrer ?
Ans. 
I have always been fascinated by the mining industry and the opportunity to work on projects that have a significant impact on society.
• Passionate about geology and engineering

• Enjoy problem-solving and working in challenging environments

• Excited about the potential to contribute to sustainable resource extraction

• Inspired by the innovation and technology advancements in the mining sector
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Q2. Tell something about our company ?
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Your company is a leading mining company with a strong focus on sustainability and innovation.
• Your company has a long history in the mining industry, with expertise in various minerals and metals.

• You prioritize safety and environmental responsibility in all mining operations.

• Your company invests in research and development to improve mining techniques and reduce environmental impact.

• You have a strong track record of co...read more
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Q1. Technical based question only
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Q2. Practical based questions according to my field of work
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Q1. Open cast questions
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Q2. Drilling and blasting
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