Deputy Engineer Interview Questions and Answers for Freshers

Updated 24 Mar 2024

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Q1. What is MTTR, How to plan the predictive maintenance

Ans.

MTTR stands for Mean Time To Repair. Predictive maintenance planning involves analyzing data to identify potential equipment failures.

MTTR is the average time it takes to repair a failed piece of equipment.
To plan predictive maintenance, data is collected and analyzed to identify patterns and potential failures.
This data can include equipment usage, environmental factors, and historical maintenance records.
Based on this analysis, maintenance schedules can be adjusted to preve...read more

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The most commonly used refrigerant at this time is R-410A, which is a hydrofluorocarbon (HFC) blend.

R-410A is a popular choice due to its high energy efficiency and environmental friendliness.
It is commonly used in air conditioning systems and heat pumps.
R-410A is a hydrofluorocarbon (HFC) blend, which means it does not contain chlorine and is less harmful to the ozone layer compared to older refrigerants like R-22.

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Stainless steel is a type of steel alloy with a minimum of 10.5% chromium content, which gives it its corrosion-resistant properties.

Stainless steel contains at least 10.5% chromium, which forms a protective oxide layer on the surface.
Other common elements in stainless steel include nickel, molybdenum, and carbon.
Different grades of stainless steel have varying compositions for specific applications.
Examples of stainless steel grades are 304, 316, and 430.

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The least count of a vernier caliper is 0.02 mm and the least count of a screw gauge is 0.01 mm.

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Ans.

The tiers are black to indicate the level of expertise or access in a hierarchical system.

Black is often associated with power, authority, and sophistication, making it a suitable choice for tiers in a hierarchical structure.
Using different colors for tiers may cause confusion or misinterpretation of the hierarchy.
Black is a neutral color that can easily be paired with other colors for design purposes.
Consistency in color coding helps in maintaining clarity and organization w...read more

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Preventive maintenance plan includes Why Why Why analysis to identify root cause of problems and prevent future occurrences.

Preventive maintenance plan is a proactive approach to maintenance that involves regularly scheduled inspections, repairs, and replacements to prevent equipment failure.
Why Why Why analysis is a technique used to identify the root cause of a problem by asking 'why' multiple times until the underlying cause is revealed.
By incorporating Why Why Why analysi...read more

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Ans.

AC cycle works by using a refrigerant to absorb heat from inside a space and release it outside, creating a cooling effect.

AC cycle starts with the refrigerant absorbing heat from inside the space, cooling the air.
The refrigerant then moves to the compressor where it is pressurized and heated.
Next, the hot refrigerant moves to the condenser coil where it releases heat to the outside air.
The refrigerant then goes through an expansion valve, reducing its pressure and temperatur...read more

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Optimized code for finding pairs in an array that sum up to a given value

Use a hash table to store the difference between the target value and each element in the array
Iterate through the array and check if the current element is in the hash table
If it is, then a pair with the target sum has been found
Time complexity can be reduced to O(n) using this approach