Oil And Natural Gas Corporation Refrigeration and Air Conditioning Mechanic Interview Questions and Answers

In case of an emergency in production plant, I would follow the emergency protocol and take necessary actions to ensure safety.

• Immediately alert the emergency response team and follow the established emergency protocol

• Evacuate the affected area and ensure all employees are accounted for

• Assess the situation and take necessary actions to contain the emergency

• Communicate with management and stakeholders to keep them infor...read more

Hazards in the plant and their control

• Chemical hazards: Proper storage and handling of hazardous chemicals

• Electrical hazards: Regular inspection and maintenance of electrical equipment

• Mechanical hazards: Implementation of safety guards and procedures

• Fire hazards: Installation of fire detection and suppression systems

• Ergonomic hazards: Providing ergonomic workstations and equipment

• Noise hazards: Use of hearing protectio

Permits required for production engineering

• Building permits for construction and modification of production facilities

• Environmental permits for compliance with regulations on emissions and waste management

• Operating permits for the operation of specific equipment or processes

• Safety permits for ensuring workplace safety and adherence to safety standards

• Export permits for exporting products to other countries

• Import permit...read more

RS 485 is a multi-point communication standard while RS 232 is a point-to-point communication standard.

• RS 485 supports up to 32 devices on a single bus while RS 232 only supports two devices.

• RS 485 uses differential signaling for noise immunity while RS 232 uses single-ended signaling.

• RS 485 can transmit data over longer distances than RS 232.

• RS 485 is commonly used in industrial automation and control systems while RS

Protocol is a set of rules and guidelines that govern the communication between devices or systems.

• Protocols ensure that devices or systems can communicate with each other effectively and efficiently.

• They define the format, timing, sequencing, and error checking of messages exchanged between devices or systems.

• Examples of protocols include TCP/IP, HTTP, FTP, and SMTP.

• Protocols can be implemented in hardware, software, ...read more

PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.

• PLC is used in industrial automation to control machinery and processes.

• It is programmed using ladder logic or other programming languages.

• PLC can be used in various applications such as manufacturing, transportation, and energy.

• Examples of PLC brands include Siemens, Allen-Bradley, and Mitsubishi.

• P...read more

There are several types of PLCs, including modular, compact, rack-mounted, and software-based PLCs.

• Modular PLCs are designed to be expandable and customizable.

• Compact PLCs are smaller and more cost-effective than modular PLCs.

• Rack-mounted PLCs are designed to be mounted in a standard equipment rack.

• Software-based PLCs run on a computer and use specialized software to emulate a physical PLC.

• Other types of PLCs include s...read more

A compressor with two stages of reciprocating motion.

• Two-stage reciprocating compressors have two cylinders that compress the air twice.

• The first stage compresses the air and sends it to the second stage for further compression.

• This type of compressor is commonly used in industrial applications such as refrigeration and air conditioning.

• The two-stage design allows for higher efficiency and greater pressure output compa