40+ MDLR Group Interview Questions and Answers

The type of bearing used in RALF and pump is usually a ball bearing or roller bearing.

• Ball bearings are commonly used in RALF and pump applications due to their ability to handle radial and axial loads.

• Roller bearings are also used in some applications where higher load capacity is required.

• The specific type of bearing used will depend on the size and speed of the equipment.

• Proper lubrication is important for the longevity and performance of the bearing.

• Regular maintenance an...read more

Various types of breakdown can occur in a crusher.

• Mechanical breakdown due to wear and tear of components

• Electrical breakdown due to faulty wiring or components

• Hydraulic breakdown due to leaks or malfunctioning of hydraulic system

• Material breakdown due to foreign objects or excessive feed size

• Operational breakdown due to improper use or maintenance

• Examples include bearing failure, motor burnout, hydraulic cylinder failure, jamming of material, etc.

The grade used in girth gear, bearing, and seal depends on the specific application and load requirements.

• The grade of girth gear depends on the size and load capacity of the gear.

• The grade of bearing depends on the speed and load capacity of the application.

• The grade of seal depends on the type of fluid being sealed and the operating temperature and pressure.

• Common grades for girth gears include ASTM A105, ASTM A350 LF2, and ASTM A694 F65.

• Common grades for bearings include A...read more

Types of lubrication include hydrodynamic, boundary, and mixed lubrication.

• Hydrodynamic lubrication occurs when a fluid film separates the moving surfaces, such as in engines.

• Boundary lubrication involves a thin layer of lubricant that prevents direct contact between surfaces, like in metal cutting.

• Mixed lubrication combines elements of both hydrodynamic and boundary lubrication, commonly found in many mechanical systems.

Lubrication grades of grease and gear oil

• Grease lubrication grades are NLGI 000, 00, 0, 1, 2, 3

• Gear oil lubrication grades are classified by the American Petroleum Institute (API) as GL-1, GL-2, GL-3, GL-4, GL-5, and GL-6

• The higher the number, the more viscous the lubricant

A pneumatic cylinder is a mechanical device that uses compressed air to produce force in a reciprocating linear motion.

• Pneumatic cylinders are commonly used in industrial automation and robotics.

• They are often used to move and position objects, as well as to apply force.

• Pneumatic cylinders come in various sizes and shapes, including single-acting and double-acting cylinders.

• They can be made from materials such as aluminum, stainless steel, and plastic.

• Examples of pneumatic cy...read more

Screw compressors use screws to compress air while lobe compressors use lobes or rotors.

• Screw compressors have two interlocking screws that rotate in opposite directions to compress air.

• Lobe compressors have two or three lobes or rotors that rotate in opposite directions to compress air.

• Screw compressors are more efficient and have a higher compression ratio than lobe compressors.

• Lobe compressors are more suitable for low-pressure applications while screw compressors are bett...read more

The gear ratio of the main drive oil gearbox is typically specified by the manufacturer.

• The gear ratio determines the speed and torque of the output shaft relative to the input shaft.

• It is important to select the appropriate gear ratio for the application to ensure optimal performance.

• The gear ratio can be calculated by dividing the number of teeth on the output gear by the number of teeth on the input gear.

• For example, if the output gear has 20 teeth and the input gear has 1...read more

EP2 and OG1 are two different types of grease grades with different properties.

• EP2 is a high-performance grease with extreme pressure additives that provide excellent protection against wear and tear.

• OG1 is a general-purpose grease that is suitable for a wide range of applications.

• EP2 is typically used in heavy-duty applications such as mining equipment, construction machinery, and industrial gearboxes.

• OG1 is commonly used in automotive applications such as wheel bearings, ch...read more

Viscosity is the measure of a fluid's resistance to flow.

• Viscosity is affected by temperature and pressure.

• It is measured in units of poise or centipoise.

• High viscosity fluids are thick and flow slowly, while low viscosity fluids are thin and flow quickly.

• Examples of high viscosity fluids include honey and molasses, while water and alcohol are low viscosity fluids.

The support roller bearing number depends on the specific application and load requirements.

• The bearing number should be selected based on the load capacity and speed requirements of the support roller.

• Factors such as temperature, lubrication, and alignment should also be considered when selecting a bearing.

• Examples of support roller bearings include cylindrical roller bearings, spherical roller bearings, and needle roller bearings.

The support roller bore diameter is the size of the hole in the center of the support roller.

• The bore diameter is important for selecting the appropriate bearing size.

• It is also important for ensuring proper alignment and fit with the shaft.

• The bore diameter can vary depending on the size and type of support roller.

• For example, a small support roller may have a bore diameter of 1 inch, while a larger one may have a bore diameter of 6 inches.

The delay in dispatching fresh orders was due to unforeseen logistical issues.

• There were unexpected delays in the supply chain, causing a backlog of orders.

• The company experienced a shortage of raw materials, which affected production timelines.

• There were issues with the transportation network, leading to delays in delivery.

• The company is taking steps to address these issues and improve delivery times in the future.

Power is the rate at which work is done or energy is transferred. A power plant converts fuel into electrical energy.

• Power is measured in watts or kilowatts.

• A power plant works by converting fuel into heat, which is then used to generate steam to turn a turbine and produce electricity.

• There are different types of power plants such as coal-fired, nuclear, hydroelectric, and renewable energy plants.

• Power factor is the ratio of real power to apparent power and is a measure of ho...read more

Impactor capacity refers to the maximum amount of material that can be processed by an impactor machine.

• Impactor capacity is typically measured in tons per hour.

• It is important to match the impactor capacity to the desired output of the operation.

• Factors that can affect impactor capacity include the size and type of material being processed, the speed of the machine, and the size of the feed opening.

• For example, a horizontal shaft impactor may have a capacity of 100-300 tons ...read more

The company has not launched any single target scheme or tour schemes due to market research and budget constraints.

• Market research indicates that customers prefer overall discounts rather than single target schemes.

• Budget constraints limit the company's ability to offer tour schemes.

• The company may consider launching such schemes in the future if market research and budget allow.

• Instead, the company focuses on providing quality products and excellent customer service to attr...read more

Types of vibration include free, forced, damped, and self-excited.

• Free vibration occurs when a system oscillates on its own without any external force.

• Forced vibration occurs when a system is subjected to an external force.

• Damped vibration is when the amplitude of vibration decreases over time due to energy dissipation.

• Self-excited vibration occurs when a system vibrates due to its own internal forces, such as in a guitar string.

Calculate total power consumption given a problem

• Determine the power consumption of each device

• Add up the power consumption of all devices

• Consider the time period over which power is consumed

• Account for any inefficiencies or losses in the system

Density unit is the measure of mass per unit volume of a substance.

• Density unit is expressed in kg/m³ or g/cm³.

• It is used to compare the mass of different substances with the same volume.

• Commonly used in industries like construction, oil and gas, and pharmaceuticals.

• Example: The density of water is 1000 kg/m³ or 1 g/cm³.

The process of how a store operates and maintains its materials involves inventory management, restocking, quality control, and regular maintenance.

• Inventory management involves tracking the quantity and location of all materials in the store.

• Restocking is the process of replenishing materials as they are used or sold.

• Quality control ensures that materials meet the store's standards and are safe for use.

• Regular maintenance includes cleaning, organizing, and repairing material...read more

Materials are stored by following a process that includes inventory management, proper labeling, organization, and regular inspections.

• Materials are stored in designated areas based on type, size, and frequency of use.

• Companies use inventory management systems to track the quantity and location of materials.

• Proper labeling of materials with information such as item name, quantity, and expiration date helps in easy identification.

• Organizing materials in a systematic manner ens...read more

Viscosity is measured in units of poise or centipoise.

• Viscosity is a measure of a fluid's resistance to flow.

• The unit of viscosity is poise or centipoise.

• Water has a viscosity of 1 centipoise at room temperature.

• Honey has a viscosity of around 2000 centipoise.

• Viscosity can be affected by temperature and pressure.

The company may have other priorities or may not see the value in branding activity.

• The company may be focused on other areas such as product development or cost-cutting measures.

• The company may not have a clear understanding of the benefits of branding activity.

• The company may not have the necessary resources or budget to support branding activity.

• Examples of successful branding activities can be provided to demonstrate the value and importance of branding.

• A discussion can b...read more

Bearing specifications and difference between centrifugal and reciprocating pumps.

• Bearing specifications include load capacity, speed rating, and lubrication requirements.

• Centrifugal pumps use impellers to create a flow of fluid, while reciprocating pumps use pistons or diaphragms.

• Centrifugal pumps are better suited for high flow rates and low viscosity fluids, while reciprocating pumps are better for high pressure and viscous fluids.

• Centrifugal pumps are generally more effic...read more

Electrical protection refers to measures taken to prevent damage to electrical equipment and ensure safety. Types of electrical faults include short circuits, overloads, and ground faults.

• Electrical protection involves the use of devices such as fuses, circuit breakers, and surge protectors to prevent damage from electrical faults.

• Types of electrical faults include short circuits, which occur when a current bypasses its intended path; overloads, which happen when too much cur...read more

The type of gear box used in EOT crane is usually a helical gear box.

• Helical gear box is commonly used in EOT cranes for its efficiency and smooth operation.

• Other types of gear boxes that may be used include worm gear box and spur gear box.

• The choice of gear box depends on factors such as load capacity, speed requirements, and space constraints.

To make green, mix blue and yellow together.

• Mix blue and yellow paint together

• Combine blue and yellow light to create green

• Mixing blue and yellow food coloring creates green frosting

I travel to SSPL by car, as it is the most convenient mode of transportation for me.

• I prefer to drive my own car to SSPL

• I occasionally use public transportation if needed

• I carpool with colleagues who live nearby

The standard mill speed varies depending on the diameter of the mill.

• The standard mill speed for a specific diameter can be calculated using the formula: Speed = (Diameter x π x RPM) / 1000

• Different mills may have different standard speeds based on their size and purpose

• It is important to refer to the manufacturer's guidelines for the recommended mill speed for each diameter

Modern tube cleaning technology for shell and tube type coolers involves automated systems using high-pressure water jets or mechanical brushes.

• Automated systems using high-pressure water jets are effective for removing debris and fouling from cooler tubes.

• Mechanical brushes can also be used to scrub the inside of tubes and remove deposits.

• Some advanced systems use robotic technology to navigate and clean tubes efficiently.

• Chemical cleaning solutions may also be used in conju...read more

Electrical protection measures for alternators

• Overcurrent protection: Protects against excessive current flow

• Overvoltage protection: Prevents damage from high voltage

• Underfrequency protection: Guards against low frequency operation

• Overtemperature protection: Prevents overheating of the alternator

• Reverse power protection: Protects against power flowing back into the alternator

• Earth fault protection: Detects and isolates faults to ground

• Short circuit protection: Safeguards agai...read more

A circuit diagram is a graphical representation of an electrical circuit.

• It shows the components and connections in the circuit

• It helps in understanding the functioning of the circuit

• It is used for designing and troubleshooting circuits

• Symbols are used to represent components like resistors, capacitors, etc.

An induction furnace is a type of furnace that uses electromagnetic induction to heat and melt metal.

• Uses electromagnetic induction to generate heat

• Commonly used in metal casting and steelmaking industries

• Can reach high temperatures quickly and efficiently

• Examples: melting scrap metal for recycling, casting molten metal into molds

Phase angle is the difference in phase between two waveforms.

• Phase angle is measured in degrees or radians.

• It is used to describe the relationship between two waveforms.

• It is important in fields such as electrical engineering and physics.

• For example, in AC circuits, the phase angle between voltage and current determines the power factor.

The laws of thermodynamics are fundamental principles that govern energy and its transformations in a system.

• The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted.

• The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.

• The third law of thermodynamics states that as a system approaches absolute zero, the entropy of the system approaches a minimum value.

The least count of a micrometer is the smallest measurement that can be read on the scale of the micrometer.

• The least count of a micrometer is typically 0.01 mm or 0.001 mm, depending on the type of micrometer.

• It is important to understand the least count in order to accurately measure dimensions using a micrometer.

• For example, a micrometer with a least count of 0.01 mm can measure up to two decimal places, while a micrometer with a least count of 0.001 mm can measure up to t...read more

Quality inspection aspects of the material involve checking for defects, consistency, and adherence to standards.

• Inspecting materials for defects such as cracks, dents, or scratches

• Ensuring consistency in color, size, and texture

• Verifying that materials meet quality standards and specifications

• Conducting tests or measurements to assess material properties

• Documenting inspection results and reporting any issues found

CCS stands for Carbon Capture and Storage.

• CCS is a technology used to capture carbon dioxide emissions from industrial processes and store them underground.

• It involves three main steps: capture, transport, and storage.

• Capture: Carbon dioxide is captured from power plants or industrial facilities using various methods such as absorption or adsorption.

• Transport: The captured carbon dioxide is then transported via pipelines or ships to suitable storage sites.

• Storage: The carbon ...read more

The power triangle is a graphical representation of the relationship between real power, reactive power, and apparent power in an AC circuit.

• Real power is represented by the horizontal leg of the triangle.

• Reactive power is represented by the vertical leg of the triangle.

• Apparent power is represented by the hypotenuse of the triangle.

• The angle between the horizontal leg and the hypotenuse is the power factor angle.

• The power factor is the ratio of real power to apparent power.

• T...read more

Torque is the product of force and distance from the axis of rotation.

• Torque = Force x Distance

• The SI unit of torque is Newton-meter (Nm)

• Torque is a measure of the rotational force applied to an object

AC and DC are types of electrical current.

• AC stands for Alternating Current and changes direction periodically.

• DC stands for Direct Current and flows in one direction only.

• AC is used in household appliances and power grids while DC is used in batteries and electronic devices.

• AC voltage can be easily transformed while DC voltage cannot be transformed easily.

There are different types of cooling towers such as natural draft, mechanical draft, crossflow, and counterflow.

• Natural draft cooling towers use the natural flow of air to cool the water.

• Mechanical draft cooling towers use fans to force air through the tower.

• Crossflow cooling towers have air flowing horizontally across the water flow.

• Counterflow cooling towers have air flowing vertically against the water flow.