20+ Interview Questions and Answers

Hydro-power plants use synchronous generators.

• Synchronous generators are commonly used in hydro-power plants.

• These generators are connected to turbines which convert the kinetic energy of water into mechanical energy.

• The mechanical energy is then converted into electrical energy by the synchronous generators.

• The generators are designed to operate at a constant speed to maintain the frequency of the electrical output.

• The size and capacity of the generators depend on the size a...read more

Insulation can be categorized into three types: thermal, acoustic, and electrical.

• Thermal insulation is used to reduce heat transfer between objects with different temperatures.

• Acoustic insulation is used to reduce sound transmission between spaces.

• Electrical insulation is used to prevent electric current from flowing through conductive materials.

• Examples of thermal insulation include fiberglass, foam board, and cellulose.

• Examples of acoustic insulation include mineral wool, ...read more

Turbo generators are machines that convert mechanical energy into electrical energy using a turbine and a generator.

• They are commonly used in power plants to generate electricity.

• The turbine is driven by steam or gas, which in turn rotates the generator.

• They can produce large amounts of electricity quickly and efficiently.

• Examples include gas turbines, steam turbines, and hydro turbines.

• They are often used in conjunction with other power generation methods, such as solar or w...read more

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

• It is a gas actuated relay that detects the presence of gas in the oil of a transformer.

• It is used to protect the transformer from faults such as overheating, overloading, and short circuits.

• It can also be used to detect minor faults that may lead to major faults if left unattended.

• The relay operates by tripping the transformer's circuit breaker when gas is detected in the oil.

• I...read more

Latest trends in communication include 5G, IoT, AI, and cloud computing. 3G, GPS, and GSM are existing technologies.

• 5G is the latest wireless communication technology that promises faster speeds and lower latency.

• IoT (Internet of Things) is the interconnectivity of devices and objects through the internet.

• AI (Artificial Intelligence) is being used to improve communication through chatbots and voice assistants.

• Cloud computing allows for remote storage and access to data and ap...read more

A power plant generates electricity by converting mechanical energy into electrical energy using a generator. The speed of the generator is controlled by a device called a governor.

• A power plant uses a fuel source, such as coal, natural gas, or nuclear energy, to heat water and produce steam.

• The steam drives a turbine, which is connected to a generator that produces electricity.

• The speed of the generator is controlled by a device called a governor, which regulates the amount ...read more

Electrical engineering deals with the study and application of electricity, while electronics focuses on the study and application of electronic devices and circuits.

• Electrical engineering primarily deals with the generation, transmission, and distribution of electrical power.

• Electronics focuses on the design and development of electronic circuits and devices.

• Electrical engineering involves working with large-scale power systems, such as power plants and electrical grids.

• Elec...read more

FT stands for Financial Times, a leading international daily newspaper focused on business and economic news.

• FT is a renowned newspaper known for its in-depth coverage of financial and economic topics.

• It provides analysis, insights, and news on global markets, companies, and economies.

• FT is trusted by professionals, investors, and decision-makers for its accurate and reliable reporting.

• The newspaper offers a wide range of content including articles, opinion pieces, and specia...read more

The principle of the sensor is to detect and measure physical or chemical properties of the environment.

• Sensors work by converting physical or chemical stimuli into electrical signals.

• They use various principles such as resistance, capacitance, or optical properties to detect and measure the stimuli.

• For example, a temperature sensor measures changes in electrical resistance as temperature changes.

• Another example is a pH sensor that measures changes in electrical potential to ...read more

A boiler is a closed vessel in which water or other fluid is heated.

• Boilers are commonly used in industries and residential buildings for heating purposes.

• They generate steam or hot water by burning fuel or using electricity.

• Boilers can be classified into different types such as fire-tube, water-tube, and electric boilers.

• Examples of boilers include steam boilers used in power plants and gas boilers used for heating homes.

The stator and rotor are key components of an electric motor. The stator is the stationary part that generates a magnetic field, while the rotor is the rotating part that interacts with the magnetic field to produce motion.

• Stator is the stationary part of an electric motor

• Stator generates a magnetic field

• Rotor is the rotating part of an electric motor

• Rotor interacts with the magnetic field generated by the stator to produce motion

A sinusoidal wave is a type of wave that has a smooth, repetitive oscillation resembling a sine curve.

• Sinusoidal waves are characterized by their amplitude, frequency, and phase.

• They are commonly seen in AC electrical circuits, sound waves, and light waves.

• The equation for a sinusoidal wave is typically represented as y = A*sin(2*pi*f*t + phi), where A is the amplitude, f is the frequency, t is time, and phi is the phase angle.

• The graph of a sinusoidal wave resembles a sine c...read more

Plant capacity refers to the maximum output or production capability of a manufacturing facility.

• Plant capacity is the maximum amount of goods or services that a plant can produce within a given time period.

• It is often measured in terms of units produced per hour, day, week, or month.

• Factors that determine plant capacity include the size of the facility, the efficiency of the production process, and the availability of resources.

• For example, a car manufacturing plant may have...read more

Peak factor is the ratio of peak value to the RMS value of a waveform.

• Peak factor is used to quantify the peakiness of a waveform.

• It is calculated by dividing the peak value of the waveform by its RMS value.

• A higher peak factor indicates a more peaky waveform with larger peaks relative to the average value.

• Peak factor is important in signal processing and power systems analysis.

ID fan is used to control the draft in the furnace while PA fan is used to supply combustion air to the furnace.

• ID fan is located at the outlet of the furnace while PA fan is located at the inlet of the furnace.

• ID fan helps in maintaining negative pressure inside the furnace while PA fan helps in supplying air for combustion.

• ID fan is used to extract flue gases from the furnace while PA fan is used to supply primary and secondary air for combustion.

• ID fan is larger in size co...read more

Theory of machine is a branch of engineering that deals with the study of machines and their mechanisms.

• Theory of machine focuses on understanding the principles behind the operation of machines.

• It involves studying the design, construction, and operation of machines.

• Examples include studying the movement of gears in a gearbox or the operation of a piston in an engine.

PA fan stands for Primary Air fan, which is used in power plants to supply air for combustion in the boiler.

• Supplies primary air for combustion in the boiler

• Helps in maintaining proper air-fuel ratio for efficient combustion

• Assists in controlling the temperature and pressure inside the boiler

• Improves the overall efficiency of the boiler

• Examples: FD fan in a power plant

A thermal plant is a power station that generates electricity by converting heat energy into electrical energy.

• Thermal plants use fuel such as coal, natural gas, or oil to heat water and produce steam.

• The steam then drives a turbine connected to a generator, which produces electricity.

• Examples of thermal plants include coal-fired power plants and gas-fired power plants.