Essar Group Interview Questions, Process, and Tips

The specific heat of air is approximately 1.005 kJ/kg·K. The internal energy is a function of temperature according to the first law of thermodynamics.

• The specific heat of air is the amount of heat energy required to raise the temperature of a unit mass of air by one degree Kelvin.

• The specific heat of air at constant pressure is approximately 1.005 kJ/kg·K.

• The first law of thermodynamics, also known as the law of conse...read more

For an adiabatic process, minimum work is done when n = 1.

• Minimum work is done for an adiabatic process when the value of n (polytropic index) is equal to 1.

• For n = 1, the process is known as an isothermal process.

• In an isothermal process, the temperature remains constant, resulting in the minimum work done.

Air Refrigerator works on the principle of cooling air through the process of evaporation and condensation.

• Air is cooled by evaporation of a refrigerant inside the refrigerator.

• The cooled air is then circulated inside the refrigerator to maintain a low temperature.

• Heat from the interior of the refrigerator is expelled outside through condensation of the refrigerant.

• This cycle of evaporation and condensation helps in ma...read more

1 horsepower is equal to 0.7457 kilowatts.

• 1 horsepower (h.p) is equal to 745.7 watts

• 1 kilowatt (kw) is equal to 1000 watts

• To convert horsepower to kilowatts, multiply by 0.7457

• Example: 1 h.p = 1 * 0.7457 = 0.7457 kw

To convert 1kg of carbon to CO, 2.67kg of oxygen is required.

• 1kg of carbon reacts with 2.67kg of oxygen to form 3.67kg of carbon monoxide.

• The balanced chemical equation for the reaction is: C + O2 -> CO

• The molar mass of carbon is 12g/mol and the molar mass of oxygen is 16g/mol.

• Using stoichiometry, we can calculate the amount of oxygen required.

Horse power per ton of refrigeration is a measure of cooling capacity.

• Horse power per ton of refrigeration measures the cooling capacity of a refrigeration system.

• It indicates the amount of power required to remove one ton of heat in 24 hours.

• A higher horse power per ton of refrigeration indicates a more efficient system.

• For example, a system with 1 horsepower per ton of refrigeration can remove 12,000 BTUs of heat per

Scale formation on the surface of the boiler tubes is due to mineral deposits from the water used in the boiler.

• Mineral deposits in the water used in the boiler can lead to scale formation on the surface of the boiler tubes.

• Common minerals that contribute to scale formation include calcium, magnesium, and silica.

• Scale formation reduces the efficiency of the boiler by insulating the heat transfer surface and increasing ...read more

Axial shift in steam turbine occurs due to thermal expansion and contraction of components.

• Thermal expansion and contraction of turbine components

• Uneven heating or cooling of the turbine casing

• Improper alignment of bearings or rotor

• Worn out thrust bearings

• Excessive vibration or misalignment

The latent heat of vaporization at low pressure and temperature refers to the amount of heat required to convert a substance from liquid to vapor under these conditions.

• The latent heat of vaporization is the energy absorbed or released during the phase transition from liquid to vapor.

• At low pressure and temperature, the latent heat of vaporization is typically lower compared to higher pressure and temperature condition...read more

The shaft revolves in a bearing pair known as a journal bearing.

• Shaft revolves in a journal bearing pair

• Journal bearing provides support and reduces friction

• Commonly used in machinery and vehicles

Electromagnetic Flow Meter is bidirectional because it can measure the flow of liquid in both directions.

• Electromagnetic Flow Meters use Faraday's law of electromagnetic induction to measure the flow of conductive liquids.

• They consist of a flow tube and two electrodes that generate a magnetic field across the liquid.

• When the liquid flows through the tube, it induces a voltage in the electrodes, which is proportional to...read more

There are two main types of Ultrasonic flow meters used in industry: Doppler and Transit-Time.

• Doppler Ultrasonic flow meters use the Doppler effect to measure flow rate by detecting the frequency shift of reflected sound waves off moving particles in the fluid.

• Transit-Time Ultrasonic flow meters measure flow rate by comparing the time it takes for an ultrasonic signal to travel upstream and downstream in the fluid.

• Both...read more

The temperature range of a K type thermocouple is typically -200 to 1250 degrees Celsius, and it is made of a combination of nickel and chromium.

• K type thermocouples have a temperature range of -200 to 1250 degrees Celsius

• They are commonly used in industrial applications due to their wide temperature range and accuracy

• K type thermocouples are made of a combination of nickel and chromium

• The combination of nickel and chr...read more

Error is a mistake or deviation from accuracy. Parallax error is the apparent shift in position of an object due to the change in the observer's position.

• Error refers to a mistake or deviation from the correct or expected result.

• Parallax error occurs when the position of an object appears to change when viewed from different angles.

• It is caused by the displacement between the object being observed and the observer's po...read more