Metso Junior Engineer Mechanical Maintenance Interview Questions and Answers

Hydraulics is a branch of engineering that deals with the mechanical properties of liquids, especially water or oil, and their applications.

• Hydraulics involves the study of fluid mechanics and the behavior of liquids under pressure.

• It is used in various applications such as hydraulic machinery, hydraulic systems, and hydraulic power transmission.

• Hydraulic systems use fluid pressure to generate, control, and transmit po...read more

Control valves are used to regulate the flow, pressure, temperature, or level of a fluid in a system.

• There are several types of control valves, including globe valves, butterfly valves, ball valves, and plug valves.

• Globe valves are commonly used for throttling and regulating flow.

• Butterfly valves are often used for large flow rates and low-pressure applications.

• Ball valves provide quick shut-off and are suitable for on...read more

Helical gearboxes are commonly used in the steel industry.

• Helical gearboxes are preferred in the steel industry due to their high efficiency and smooth operation.

• These gearboxes provide better load distribution and reduce noise and vibration.

• They are capable of handling heavy loads and high torque requirements.

• Helical gearboxes are commonly used in steel rolling mills, steel processing plants, and other steel manufactu

Check in bearing is a type of bearing that allows axial movement while preventing radial movement.

• Check in bearing is designed to accommodate axial loads.

• It allows movement in one direction while preventing movement in the opposite direction.

• This type of bearing is commonly used in applications where axial displacement is required, such as in automotive suspensions.

• An example of a check in bearing is a thrust bearing u

Servo valve nas value refers to the National Aerospace Standard (NAS) specification for servo valves.

• NAS value is a standard that defines the performance and quality requirements for servo valves used in aerospace applications.

• It ensures that servo valves meet specific criteria for reliability, accuracy, and durability.

• NAS value is often used as a reference when selecting or evaluating servo valves for aerospace system...read more

There are two types of vibration - free and forced. Free vibration occurs when a system oscillates on its own, while forced vibration occurs when an external force is applied to the system.

• Free vibration occurs when a system is disturbed and then allowed to oscillate on its own without any external force acting on it.

• Forced vibration occurs when an external force is applied to a system, causing it to vibrate at a speci...read more

Maintenance of ball mill and its associated equipment involves regular inspection, cleaning, lubrication, and replacement of worn parts.

• Regularly inspect the ball mill and its associated equipment for any signs of wear or damage

• Clean the ball mill and its associated equipment regularly to prevent buildup of debris and dirt

• Lubricate the ball mill and its associated equipment as per the manufacturer's recommendations

• Repl...read more

Open circuit has a break in the circuit, while closed circuit has a complete path for current flow.

• Open circuit has a switch that is turned off or a broken wire, which prevents current flow.

• Closed circuit has a switch that is turned on or a complete path for current flow.

• Open circuit does not allow electricity to flow, while closed circuit allows electricity to flow.

• Examples of open circuit include a light switch turne...read more

The total length of ball mill liners and diaphragm slot size depend on the make and model of the mill.

• The length of the liners and size of the diaphragm slot can vary depending on the manufacturer and model of the ball mill.

• The liner categories can include single wave, double wave, or corrugated liner designs.

• The diaphragm slot size can range from a few millimeters to several centimeters, depending on the size of the m...read more

Bearings are of various types such as ball, roller, plain, etc. Furnace maintenance includes cleaning, inspection, and replacement of parts.

• Different types of bearings are used in mechanical systems depending on the load and speed requirements.

• Ball bearings are commonly used in high-speed applications while roller bearings are used in heavy load applications.

• Plain bearings are used in low-speed and high-load applicatio...read more