NBTC GROUP HSE Officer Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two coils of wire, called the primary and secondary, wrapped around a magnetic core.

• When an AC current flows through the primary coil, it creates a magnetic field that in...read more

Earthing is the process of connecting electrical equipment to the earth to prevent electric shock.

• There are several types of earthing, including plate earthing, rod earthing, pipe earthing, and strip earthing.

• Plate earthing involves burying a copper plate in the earth and connecting it to the electrical equipment.

• Rod earthing involves driving a copper rod into the earth and connecting it to the electrical equipment.

• Pip...read more

Circuit breakers are of different types such as thermal, magnetic, hydraulic-magnetic, and residual current devices.

• Thermal circuit breakers use a bimetallic strip to trip the breaker when it gets too hot.

• Magnetic circuit breakers use an electromagnet to trip the breaker when it detects an overload.

• Hydraulic-magnetic circuit breakers combine the features of both thermal and magnetic circuit breakers.

• Residual current de...read more

Star delta starter is an electrical motor starting mechanism that reduces the starting current and torque.

• Used for starting high power motors

• Consists of three contactors and a timer

• Initially starts the motor in star configuration and then switches to delta configuration

• Reduces starting current and torque

• Commonly used in industrial applications

Buchholz relay is a protective device used in oil-filled transformers to detect and prevent faults.

• It is a type of gas actuated relay

• It is installed in the oil-filled transformer tank

• It detects the presence of gas or air bubbles in the oil

• It trips the transformer if a fault is detected

• It helps to prevent major damage to the transformer

Standards for plant layout in refineries ensure safety, efficiency, and compliance with regulations.

• Plant layout should prioritize safety and minimize the risk of accidents.

• Efficiency is also important, with consideration given to the flow of materials and equipment.

• Regulations and industry standards must be followed, such as those set by OSHA and API.

• Examples of layout considerations include spacing between equipment,...read more

The frequency of visiting vendor shops for expediting depends on various factors such as project timelines, vendor reliability, and urgency of the situation.

• The frequency of visiting vendor shops for expediting can vary from daily visits to weekly or monthly visits.

• It depends on the project timelines and the urgency of the situation. If a project is running behind schedule, more frequent visits may be required to ensur...read more

DCU stands for Dublin City University, a university located in Dublin, Ireland.

• DCU was established in 1980 and has over 17,000 students.

• It offers a wide range of undergraduate and postgraduate courses in various fields such as business, engineering, science, arts, and humanities.

• DCU is known for its innovative approach to education and research, and has partnerships with many leading companies and institutions.

• Some not...read more

Delayed is called so because it refers to something that is postponed or occurs after the expected time.

• The term 'delayed' is used to describe situations where there is a time lag or postponement.

• It implies that something is not happening immediately or as scheduled.

• Delays can occur due to various reasons such as technical issues, logistical problems, or unforeseen circumstances.

• For example, a delayed flight refers to ...read more

Power transmission & operation of batching plant in transit mixer is crucial for efficient concrete mixing.

• Power transmission in transit mixer is done through a hydraulic motor which is connected to the mixer drum.

• The batching plant is responsible for mixing the ingredients in the right proportion and delivering it to the transit mixer.

• The operation of the batching plant involves loading the ingredients into the hopper...read more

The CO gas limit is the maximum allowable concentration of carbon monoxide in the air.

• The CO gas limit is set by regulatory agencies to protect human health and safety.

• The limit varies depending on the location and type of facility.

• For example, the Occupational Safety and Health Administration (OSHA) has set a permissible exposure limit (PEL) of 50 parts per million (ppm) for an 8-hour workday.

• In residential homes, the...read more