Universal Construction Machinery And Equipment Interview Questions and Answers

The compressor installation and commissioning procedure involves several steps to ensure proper functioning and efficiency.

• Prepare the site for installation by ensuring a suitable foundation and proper ventilation.

• Position the compressor unit and connect it to the power supply.

• Install the necessary piping and connections for air intake and discharge.

• Check and adjust the oil level and ensure proper lubrication.

• Perform a...read more

Compressor testing standards ensure the quality and performance of compressors.

• Compressor testing standards vary depending on the type of compressor and its intended use.

• Some common testing standards include ASME PTC 10 for centrifugal compressors and API 617 for axial and centrifugal compressors.

• Testing may include performance testing, vibration testing, and noise testing.

• Compressor manufacturers may also have their o...read more

I will implement a robust inventory management system with real-time tracking and forecasting.

• Implement a centralized inventory management system

• Track inventory levels in real-time

• Forecast demand and adjust inventory levels accordingly

• Maintain good relationships with suppliers to ensure timely delivery

• Regularly review inventory data to identify trends and make informed decisions

• Implement a system for returns and exchan...read more

Warranty claim procedure is the process of making a claim for repair or replacement of a product covered under warranty.

• The customer contacts the manufacturer or seller to initiate the claim process.

• The customer provides proof of purchase and details of the issue with the product.

• The manufacturer or seller may request additional information or inspection of the product.

• If the claim is approved, the manufacturer or sell...read more

Checkpoints before first start of machine

• Inspect machine for any damage or missing parts

• Ensure all safety guards and devices are in place and functioning properly

• Check oil and fluid levels and fill as necessary

• Verify proper electrical connections and grounding

• Perform a test run to ensure proper operation

• Train operators on safe and proper use of the machine

To check vibration of airend, use a vibration meter at specific points. Standard varies by manufacturer. Allowable vibration value depends on machine type and application.

• Use a vibration meter to check vibration of airend

• Check vibration at specific points as per manufacturer's instructions

• Standard for allowable vibration varies by manufacturer

• Allowable vibration value depends on machine type and application

The key elements of airend are rotors, bearings, seals, and housing. The gap between screw elements should be 0.1-0.3mm.

• Airend consists of rotors, bearings, seals, and housing.

• Rotors are the main components that compress the air.

• Bearings support the rotors and reduce friction.

• Seals prevent air leakage and maintain efficiency.

• Housing encloses the airend and provides structural support.

• The gap between screw elements shou

Check refrigerant level, condenser coil, fan motor, and thermostat.

• Check refrigerant level and add if necessary.

• Clean condenser coil and ensure proper airflow.

• Check fan motor for proper functioning.

• Check thermostat and adjust if necessary.

The check points to resolve the issue of a compressor tripping with high ampere.

• Check the electrical connections for loose or damaged wires

• Inspect the compressor motor for any signs of overheating or damage

• Verify that the compressor is receiving the correct voltage

• Check the refrigerant levels and ensure they are within the specified range

• Inspect the condenser coils for any blockages or dirt buildup

• Check the compressor'...read more

Parameters to check during compressor testing

• Check the suction and discharge pressure

• Check the oil level and quality

• Check the motor amperage and voltage

• Check for any abnormal noise or vibration

• Check the refrigerant charge level

• Check the condenser and evaporator coils for cleanliness

• Check the compressor's temperature

• Check the compressor's oil pressure

• Check the compressor's discharge temperature

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 syste

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

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 ro

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 bor

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 gui

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.

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.

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.

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 fail

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...read more

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 alumi...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 hori...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 ...read more

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 L...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 ...read more

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 longe...read more

Yes, I am familiar with costing in supply chain management.

• I have experience in creating and managing budgets for supply chain operations.

• I am knowledgeable in cost analysis and identifying cost-saving opportunities.

• I am familiar with different costing methods such as activity-based costing and standard costing.

• I have worked with cross-functional teams to optimize costs while maintaining quality and service levels.

• For ...read more