Maintenance Engineer Interview Questions and Answers in 2025 (100+ Q&A)

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What are the Safety measures in central chiller plant? Explain them?

Asked In :- british steel,

Right Answer:
1. **Personal Protective Equipment (PPE)**: Ensure all personnel wear appropriate PPE such as gloves, goggles, and hard hats.

2. **Lockout/Tagout (LOTO)**: Implement LOTO procedures to ensure equipment is properly shut off and not able to be started up again before maintenance work is completed.

3. **Regular Inspections**: Conduct routine inspections of equipment and safety systems to identify and address potential hazards.

4. **Emergency Shutdown Procedures**: Establish clear emergency shutdown procedures and ensure all staff are trained on them.

5. **Ventilation**: Maintain proper ventilation in the chiller plant to prevent the buildup of harmful gases and ensure air quality.

6. **Chemical Handling**: Follow safety protocols for handling refrigerants and other chemicals, including proper storage and spill response procedures.

7. **Fire Safety**: Install and maintain fire suppression systems and ensure access to fire extinguishers.

8. **Training and Awareness**: Provide regular safety training for all employees

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What are the plant parametres?

Asked In :- Skanska UK, a.g. coombs,

Right Answer:
Plant parameters refer to the key metrics and conditions that are monitored to ensure optimal operation and maintenance of a facility. These typically include:

1. Temperature
2. Pressure
3. Humidity
4. Flow rates
5. Equipment performance metrics
6. Energy consumption
7. Vibration levels
8. Chemical concentrations
9. Maintenance schedules
10. Safety compliance indicators

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What is HVAC?

Asked In :-

Right Answer:
HVAC stands for Heating, Ventilation, and Air Conditioning. It refers to the technology used to control the indoor climate of buildings by regulating temperature, humidity, and air quality.

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- Name fuels used in nuclear power plant?

Asked In :- Julius Berger,

Right Answer:
Uranium and plutonium.

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What is the difference between fermentor and bioreactor?

Asked In :- SEAT, ferchau engineering,

Right Answer:
A fermentor is specifically designed for fermentation processes, primarily for growing microorganisms to produce products like alcohol or antibiotics. A bioreactor, on the other hand, is a broader term that refers to any vessel where biological reactions occur, including fermentation, cell culture, and other processes involving living cells or enzymes.

General Management Maintenance Engineer

Ques:- How can we communiucate as realistic a picture as possible of a job and of the organization to prospective emplyees? What kinds of issues are most crucial to them?

Asked In :- textron aviation,

Right Answer:
To communicate a realistic picture of a job and organization to prospective employees, provide clear and honest job descriptions, share insights about the company culture, and discuss both the challenges and benefits of the role. Crucial issues for candidates often include work-life balance, career growth opportunities, team dynamics, and the organization's values and mission.

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What is C.H.R. in industries.

Asked In :- ANSYS Software, Sharjah Electricity and Water Authority SEWA,

Right Answer:
C.H.R. stands for "Cooling Heat Rejection" in industries.

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What is inverter

Asked In :- Texmaco Rail Engineering Ltd,

Right Answer:
An inverter is an electronic device that converts direct current (DC) into alternating current (AC), allowing the use of DC power sources, like batteries, to power AC appliances.

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- What are types of central ac plants?

Asked In :-

Right Answer:
The types of central AC plants include:

1. Chilled Water Systems
2. Direct Expansion (DX) Systems
3. Absorption Chillers
4. Air-Cooled Chillers
5. Water-Cooled Chillers
6. Variable Refrigerant Flow (VRF) Systems

Maintenance Engineer PlantFacilitiesMaintenance

Ques:- Why should we have to maintain excess air in furnaces andboilers while burning any fuel?

Asked In :- sydney trains,

Right Answer:
Maintaining excess air in furnaces and boilers ensures complete combustion of the fuel, reduces the formation of harmful emissions like carbon monoxide, and helps prevent soot buildup, which can improve efficiency and safety.

Linux Maintenance Engineer

Ques:- You have a file called phonenos that is almost 4,000 lines long. What text filter can you use to split it into four pieces each 1,000 lines long?

Asked In :- Aarti Industries, argonne national laboratory, isuzu, jk cement ltd, hochtief(india) pvt ltd,

Right Answer:
You can use the `split` command:

```bash
split -l 1000 phonenos
```

Linux Maintenance Engineer

Ques:- You have entered the following cronjob. When will it run? 15 * * * 1,3,5 myscriptChoose one:a. at 15 minutes after every hour on the 1st, 3rd and 5th of each month.b. at 1:15 am, 3:15 am, and 5:15 am every dayc. at 3:00 pm on the 1st, 3rd, and 5th of each monthd. at 15 minutes after every hour every Monday, Wednesday, and Friday

Asked In :- unirac, inc.,

Right Answer:
d. at 15 minutes after every hour every Monday, Wednesday, and Friday

Maintenance Engineer Windows

Ques:- What happens when the CloseHandle(handle) is called?

Asked In :- cumulus systems,

Right Answer:
When CloseHandle(handle) is called, it closes the specified handle and releases the resources associated with it. If the handle is a valid object, it will be marked for deletion, and if it is the last reference to that object, the system will clean up the associated resources.

Linux Maintenance Engineer

Ques:- What is wrong with the following command? tar cvfb / /dev/tape 20Choose onea. You cannot use the c option with the b option.b. The correct line should be tar -cvfb / /dev/tape20.c. The arguments are not in the same order as the corresponding modifiers.d. The files to be backed up have not been specified.

Asked In :-

Right Answer:
d. The files to be backed up have not been specified.

Linux Maintenance Engineer

Ques:- You have written a script called usrs to parse the passwd file and create a list of usernames. You want to have this run at 5 am tomorrow so you can see the results when you get to work. Which of the following commands will work?Choose one:a. at 5:00 wed usrsb. at 5:00 wed -b usrsc. at 5:00 wed -l usrsd. at 5:00 wed -d usrs

Asked In :- Intelizign,

Right Answer:
a. at 5:00 wed usrs

Linux Maintenance Engineer

Ques:- What would be the result of the command paste -s dog cat?Choose one:a. The corresponding lines from the files dog and cat would be pasted together separated by a tab.b. The corresponding lines from the files dog and cat would be pasted together separated by a space.c. The file cat would be pasted after the file dog.d. The file dog would be pasted after the file cat.

Asked In :- MAXVY, northwestern mutual, dpdk,

Right Answer:
c. The file cat would be pasted after the file dog.

Maintenance Engineer Windows

Ques:- How the handles are handled in the child process?

Asked In :- Krishna Maruti Ltd, tata communications transformation services (tcts), tsi,

Right Answer:
In a child process, handles are inherited from the parent process by default. However, the child process can also create new handles or close inherited handles as needed. To control handle inheritance, the parent can set the `bInheritHandle` parameter to `FALSE` when creating a handle, preventing it from being inherited by the child process.

Maintenance Engineer Windows

Ques:- You forget to call CloseHandle – will there be a memory leak?

Asked In :- Vertoz Advertising, snow software, compucom,

Right Answer:
Yes, forgetting to call CloseHandle will lead to a resource leak, but not a memory leak in the traditional sense. It will result in a handle leak, which can exhaust system resources over time.

Linux Maintenance Engineer

Ques:- You routinely compress old log files. You now need to examine a log from two months ago. In order to view its contents without first having to decompress it, use the _________ utility.

Asked In :- plintron,

Right Answer:
zcat

Linux Maintenance Engineer

Ques:- Which two utilities can you use to set up a job to run at a specified time?Choose one:a. at and crondb. atrun and crontabc. at and crontabd. atd and crond

Asked In :- KSE Electricals, saipem, united launch alliance (ula), burn manufacturing usa llc,

Right Answer:
c. at and crontab

Welcome to the Maintenance Engineer interview question bank on takluu.com! If you’re applying for roles in manufacturing, production, power plants, oil & gas, FMCG, or construction industries, this category is tailor-made for you.

Our expert-curated content covers every critical area:

Preventive and Predictive Maintenance
Breakdown Analysis & Root Cause Identification
TPM (Total Productive Maintenance)
Safety Protocols
CMMS Systems
Spare Parts Management
Mechanical, Electrical & Instrumentation Maintenance

Here are some sample questions you’ll explore:

How do you handle unexpected equipment failure during peak hours?
What’s the process of conducting Root Cause Analysis (RCA)?
Which KPIs do you track for maintenance performance?
What’s your experience with CMMS tools like SAP PM or Maximo?
How do you ensure safety compliance during maintenance shutdowns?

Whether you’re a junior maintenance engineer, shift engineer, or plant-level technical head, these questions help you demonstrate technical depth, process awareness, and safety-first mindset—qualities companies like L&T, Reliance, Tata Power, ABB, Siemens, and JSW actively seek.

Our platform also offers scenario-based questions and real-time case discussions to help you stand out.

Your next role starts with preparation. Start here—only at takluu.com.

Questions in: Maintenance Engineer

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