RHI Magnesita Assistant Manager Maintenance Interview Questions and Answers

Hydraulic press works on the principle of Pascal's law, which states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.

• Hydraulic press uses a hydraulic cylinder to generate a compressive force.

• When a force is applied to the small piston, it creates pressure in the enclosed fluid.

• This pressure is transmitted through the fluid...read more

A servo valve is a type of valve used in hydraulic systems to control the flow of fluid by varying the size of the flow passage.

• Servo valves are used in applications where precise control of fluid flow is required, such as in aircraft control systems.

• They work by using an electrical signal to move a spool inside the valve, which in turn adjusts the size of the flow passage.

• The movement of the spool is proportional to t...read more

The step-by-step process for opening a profil valve involves several key actions.

• Ensure the valve is in the closed position before starting.

• Locate the valve handle or actuator.

• Turn the valve handle or actuator counterclockwise to open the valve.

• Monitor the pressure or flow rate to ensure proper operation.

• Close the valve by turning the handle or actuator clockwise when finished.

• Perform any necessary maintenance or inspe...read more

A servo valve is used for precise control of flow rate, while a proportional valve is used for controlling the flow rate proportionally to the input signal.

• Servo valves are typically used in applications where precise control of flow rate is required, such as in aerospace or industrial automation.

• Proportional valves are used to control the flow rate proportionally to the input signal, making them suitable for applicati...read more

A hydraulic circuit consists of various components like pumps, valves, cylinders, and hoses that work together to control the flow of hydraulic fluid.

• Hydraulic pump: generates the flow of hydraulic fluid

• Valves: control the direction and pressure of the fluid

• Cylinders: convert fluid power into mechanical power

• Hoses: transport the fluid between components

• Reservoir: stores the hydraulic fluid

• Filters: remove contaminants f...read more

Preventive maintenance should be planned based on equipment criticality, historical data, manufacturer recommendations, and available resources.

• Identify critical equipment that needs regular maintenance to prevent breakdowns.

• Refer to historical data to determine common issues and plan preventive measures accordingly.

• Follow manufacturer recommendations for maintenance schedules and procedures.

• Allocate resources such as ...read more

MTTR is the average time taken to repair a failed system, while MTBF is the average time between failures.

• MTTR measures how quickly a system can be restored after a failure

• MTBF measures the average time a system operates before experiencing a failure

• MTTR = Total downtime / Number of failures

• MTBF = Total uptime / Number of failures

To open a CNC machine ball screw assembly, follow these steps:

• Start by removing the protective covers from the ball screw assembly

• Use the appropriate tools to loosen and remove the fasteners securing the ball screw assembly

• Carefully lift the ball screw assembly out of the machine, taking care not to damage the components

• Inspect the ball screw assembly for any signs of wear or damage

• Clean the ball screw assembly and sur...read more

Flow control valve regulates the flow rate of a fluid, while relief valve protects equipment from overpressure by releasing excess fluid.

• Flow control valve is used to regulate the flow rate of a fluid in a system.

• Relief valve is designed to protect equipment from overpressure by releasing excess fluid to prevent damage.

• Flow control valve is typically used to control the speed of hydraulic cylinders or motors.

• Relief val...read more