JSW Steel Mining Engineer Interview Questions and Answers

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Q1. Difference between space and burden of blasting
Ans. 
Space is the distance between blastholes, while burden is the distance from the blasthole to the free face of the rock.
• Space is the distance between blastholes in a blast pattern.

• Burden is the distance from the blasthole to the free face of the rock.

• Space affects the fragmentation and distribution of the blasted material.

• Burden influences the amount of energy transferred to the rock mass.

• Optimal space and burden ratios
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Q2. Types of coal grade
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Coal grades are categorized based on their carbon content and energy value.
• Coal grades include lignite, sub-bituminous, bituminous, and anthracite

• Higher carbon content coal grades have higher energy value

• Anthracite is the highest grade coal with the highest carbon content and energy value
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Q1. Machine transmission distribution
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Q2. Electric generation
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Q3. Electric measurement
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Q1. (1) tell your self, (2) Passt company work, (3) what is VFD and it's diagram, (4) Electrical maintenance related questions
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Q2. Motor related questions
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Q3. MCC and PCC panel
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Q1. (1) Salary discussion, (2) Experience related questions
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Q1. Power factor What is vfd Difference between ac and dc motor
Ans. 
Power factor is the ratio of real power to apparent power in an AC circuit. VFD stands for Variable Frequency Drive. AC motors run on alternating current while DC motors run on direct current.
• Power factor is a measure of how effectively electrical power is being used in a circuit.

• It is calculated by dividing the real power (in watts) by the apparent power (in volt-amperes).

• A power factor of 1 indicates that all the pow...read more
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Q2. Types of load cell
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Types of load cells include strain gauge load cells, hydraulic load cells, and capacitive load cells.
• Strain gauge load cells measure the strain or deformation of a material.

• Hydraulic load cells use hydraulic fluid to measure force.

• Capacitive load cells measure changes in capacitance to determine force.

• Other types of load cells include piezoelectric load cells and pneumatic load cells.
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Q1. Which type of protection used in a substation
Ans. 
Different types of protection are used in a substation to ensure safety and reliability.
• Overcurrent protection: Protects against excessive current flow.

• Overvoltage protection: Safeguards against high voltage surges.

• Differential protection: Detects faults by comparing currents entering and leaving the substation.

• Distance protection: Protects transmission lines based on the distance to the fault.

• Ground fault protection: ...read more
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Q2. Which type of ht breaker used in ht line
Ans. 
Different types of HT breakers are used in HT lines depending on the specific requirements.
• Air Circuit Breaker (ACB) is commonly used in HT lines for its high breaking capacity and quick response time.

• Vacuum Circuit Breaker (VCB) is another popular choice due to its compact size and low maintenance requirements.

• SF6 Circuit Breaker is used for high voltage applications as it provides excellent arc quenching properties.

• O...read more
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Q1. What is thermocouple?
Ans. 
A thermocouple is a device that measures temperature by detecting the voltage difference between two different metals.
• Consists of two different metal wires joined at one end

• Produces a voltage that varies with temperature

• Used in temperature measurement and control systems

• Commonly used in industrial applications such as furnaces and boilers
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Q2. What is ohomic value of PT-100?
Ans. 
The ohmic value of PT-100 is 100 ohms at 0°C.
• PT-100 is a type of platinum resistance thermometer.

• It has a resistance of 100 ohms at 0°C.

• The resistance increases with temperature at a rate of 0.385 ohms/°C.

• PT-100 is commonly used in industrial temperature measurement applications.
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Q3. What is calibration 3.0 and 5.0?
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Calibration 3.0 and 5.0 refer to the accuracy level of a measuring instrument.
• Calibration 3.0 means the instrument has an accuracy level of 0.3% of the full scale reading.

• Calibration 5.0 means the instrument has an accuracy level of 0.5% of the full scale reading.

• The higher the calibration number, the more accurate the instrument is.

• Calibration is the process of adjusting an instrument to ensure its accuracy.

• Calibratio...read more
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Q1. What is capacity your furnace
Ans. 
The capacity of a furnace refers to its heating output, typically measured in BTUs or tons.
• Furnace capacity is determined by the amount of heat it can produce.

• It is usually measured in BTUs (British Thermal Units) or tons.

• Higher capacity furnaces can produce more heat and are suitable for larger spaces.

• For example, a furnace with a capacity of 80,000 BTUs can heat a larger area compared to one with a capacity of 40,000
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Q2. What is drive components in CCM department
Ans. 
Drive components in CCM department are the parts that enable the motor to function properly.
• Drive components include motors, gears, belts, and pulleys.

• They work together to transfer power from the motor to the machine.

• The components must be properly sized and aligned to ensure efficient operation.

• Examples of machines that use drive components include conveyor belts, pumps, and fans.
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