Nahar Colours & Coating Executive Mechanical Maintenance Interview Questions and Answers

To calculate the displacement of a bike without tools, measure the distance traveled in one full rotation of the wheel

• Measure the circumference of the bike's wheel

• Count the number of rotations the wheel makes over a certain distance

• Multiply the circumference by the number of rotations to get the displacement

• Displacement = Circumference of wheel x Number of rotations

There are several types of valves used in mechanical engineering for controlling the flow of fluids or gases.

• Types of valves include ball valves, gate valves, globe valves, butterfly valves, check valves, and pressure relief valves.

• Valves can be classified based on their function (e.g. isolation valves, control valves), design (e.g. rotary valves, linear valves), or material (e.g. brass valves, stainless steel valves).

• ...read more

Current CTC refers to the total salary package of an individual including all benefits and allowances.

• Current CTC includes base salary, bonuses, incentives, and other perks.

• It is important to provide an accurate figure when asked about current CTC.

• Example: Current CTC is INR 10 lakhs per annum.

TDC stands for Top Dead Center and BDC stands for Bottom Dead Center. They are reference points in the rotation of an engine's crankshaft.

• TDC is the point where the piston is at its highest position in the cylinder during the compression stroke.

• BDC is the point where the piston is at its lowest position in the cylinder during the exhaust stroke.

• Understanding TDC and BDC is crucial for timing engine components such as v...read more

The clearance of TDC and BDC for a vertical reciprocating compressor can be measured using a dial indicator.

• Use a dial indicator to measure the distance between the top dead center (TDC) and bottom dead center (BDC) positions of the piston.

• Rotate the crankshaft to bring the piston to TDC and set the dial indicator to zero.

• Rotate the crankshaft to bring the piston to BDC and note the reading on the dial indicator.

• The di...read more

The clearance for big end bearing can be measured using a micrometer or a feeler gauge.

• Use a micrometer to measure the diameter of the crankshaft journal and the inner diameter of the big end bearing. The clearance is calculated by subtracting the crankshaft journal diameter from the bearing inner diameter.

• Alternatively, a feeler gauge can be used to measure the clearance by inserting the gauge between the crankshaft j...read more

Focus on proper alignment, tightness, material compatibility, and proper torque during suction and discharge valve box up.

• Ensure proper alignment of the valves to prevent leakage

• Check for tightness of the connections to avoid any leaks

• Use materials compatible with the fluid being handled to prevent corrosion or damage

• Apply the correct torque to the bolts to ensure a secure connection

Hydrotest is a pressure test conducted on pipes, vessels, or equipment to ensure their strength and integrity.

• Hydrotest is required to ensure that the equipment can withstand the design pressure and prevent leaks or failures.

• It involves filling the equipment with water or other fluids and pressurizing it to a specified level for a certain duration.

• The pressure is then released, and the equipment is inspected for any le...read more

Pressure gauges are used to measure the pressure of fluids and gases in various industries.

• Pressure gauges come in different ranges depending on the application.

• The range of a pressure gauge should be selected based on the maximum pressure expected in the system.

• The accuracy of the pressure gauge should also be considered when selecting a gauge.

• Pressure gauges should be calibrated regularly to ensure accurate readings.

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Maintenance procedures for heat exchangers involve regular cleaning, inspection, and testing to ensure optimal performance.

• Regularly clean the heat exchanger tubes to remove any buildup of debris or scale

• Inspect the heat exchanger for leaks, corrosion, or other signs of damage

• Test the heat exchanger for efficiency and performance using pressure and temperature measurements

• Replace any worn out or damaged parts to preven...read more

Maintenance procedures for tanks and vessels involve regular inspections, cleaning, and repairs to ensure safe and efficient operation.

• Regularly inspect tanks and vessels for signs of corrosion, leaks, or damage.

• Clean tanks and vessels to remove buildup of sediment, rust, or other contaminants.

• Repair any cracks, leaks, or structural damage promptly to prevent further deterioration.

• Perform routine maintenance tasks such...read more

I have been working as a piping engineer for 5 years.

• I have 5 years of experience working specifically as a piping engineer.

• During this time, I have gained expertise in designing, analyzing, and implementing piping systems.

• I have worked on various projects that involved piping design, layout, and maintenance.

• I have also collaborated with other engineers and professionals to ensure the successful completion of projects.

Yes, I have experience working on piping in various projects.

• I have designed piping systems for industrial plants

• I have conducted stress analysis on piping systems

• I have worked on troubleshooting and maintenance of piping systems

Equipment installation involves setting up machinery and ensuring it operates correctly.

• Understanding technical specifications and blueprints

• Assembling and connecting components

• Testing and troubleshooting

• Adhering to safety regulations

• Collaborating with other professionals

• Examples: installing HVAC systems, manufacturing equipment, or production lines