10+ Junior Engineer Mechanical Maintenance Interview Questions and Answers

Steam is discharged from the body during winter bathing due to the difference in temperature between the body and the surrounding air.

• The body is warmer than the surrounding air, causing the moisture on the skin to evaporate and form steam.

• The steam is visible due to the cold air condensing the water vapor.

• This is a natural process and does not indicate any medical condition.

Control valve internal leakages can be checked through various methods.

• Performing a visual inspection of the valve and its components

• Using ultrasonic leak detection equipment

• Conducting a pressure drop test

• Performing a bubble test using a soap solution

• Checking the valve position indicator

• Analyzing the valve's performance data

• Regular maintenance and testing of the valve

A pump is a mechanical device used to move fluids from one place to another. There are different types of pumps based on their working principle and application.

• Types of pumps include centrifugal pumps, positive displacement pumps, reciprocating pumps, and rotary pumps.

• Centrifugal pumps use a rotating impeller to create a flow of fluid.

• Positive displacement pumps trap a fixed amount of fluid and then force it into a discharge pipe.

• Reciprocating pumps use a piston or diaphragm...read more

Answering a question on Carbon-iron graph and roughness for Junior Engineer Mechanical Maintenance.

• Carbon-iron graph shows the relationship between carbon content and hardness of steel.

• Roughness is the measure of irregularities in a surface, usually measured in micrometers.

• It can affect the performance and lifespan of mechanical components.

• Surface roughness can be controlled through various machining processes such as grinding, polishing, and honing.

• Carbon-iron graph can be u...read more

Zero breakdown in line maintenance is the goal of any maintenance team.

• Regular preventive maintenance checks

• Proper lubrication of machines

• Timely replacement of worn-out parts

• Training of maintenance staff

• Use of advanced technologies like predictive maintenance

• Continuous monitoring of equipment performance

Instrument and material differences are related to the type and function of equipment used in mechanical maintenance.

• Instruments are tools used to measure, monitor, or control various parameters such as temperature, pressure, flow rate, etc.

• Materials are substances used to construct or repair equipment, such as metals, plastics, ceramics, etc.

• Instruments are typically electronic or mechanical devices, while materials can be natural or synthetic.

• Examples of instruments include...read more

Pump is used to transfer fluids while motor is used to convert electrical energy into mechanical energy.

• Pump is used to move fluids from one place to another while motor is used to rotate machinery.

• Pump has an inlet and outlet while motor has a rotor and stator.

• Pump is used in fluid systems while motor is used in mechanical systems.

• Examples of pumps include centrifugal pumps, positive displacement pumps, and axial flow pumps. Examples of motors include AC motors, DC motors, a...read more

Possible causes of slow hydraulic cylinder operation

• Low hydraulic fluid level

• Clogged or dirty hydraulic filter

• Worn out piston seals

• Leaking hydraulic lines

• Faulty control valve

• Incorrectly adjusted relief valve

• Excessive load on the cylinder

• Improperly sized cylinder for the application

A hydraulic system is a technology that uses liquid to transmit power.

• Uses incompressible fluid to generate power

• Consists of a pump, valves, cylinders, and hydraulic fluid

• Commonly used in heavy machinery like excavators and cranes

The fuel system is responsible for delivering fuel to the engine for combustion.

• The fuel system includes the fuel tank, fuel pump, fuel filter, fuel injectors, and carburetor.

• The fuel pump draws fuel from the tank and sends it to the engine.

• The fuel filter removes impurities from the fuel before it reaches the engine.

• Fuel injectors spray fuel into the engine's combustion chamber, while a carburetor mixes fuel and air before sending it to the engine.

• The fuel system must be reg...read more