Central Electricity Authority Interview Questions and Answers

Prandtl number and Schmidt number are dimensionless numbers used in fluid mechanics.

• Prandtl number represents the ratio of momentum diffusivity to thermal diffusivity in a fluid.

• Schmidt number represents the ratio of momentum diffusivity to mass diffusivity in a fluid.

• Prandtl number is used to characterize the relative importance of heat transfer and momentum transfer in a fluid.

• Schmidt number is used to characterize t...read more

Rankine cycle is a thermodynamic cycle used in power plants to generate electricity.

• It is a cycle that involves the use of steam to generate power.

• It consists of four processes: heating, expansion, cooling, and compression.

• The cycle is named after William John Macquorn Rankine, a Scottish engineer and physicist.

• It is commonly used in power plants that use fossil fuels or nuclear energy.

• The efficiency of the cycle can b...read more

Diesel cycle is a constant pressure cycle while Otto cycle is a constant volume cycle.

• Diesel cycle uses compression ignition while Otto cycle uses spark ignition.

• Diesel cycle has a higher compression ratio than Otto cycle.

• Diesel cycle is more efficient than Otto cycle due to higher compression ratio.

• Otto cycle is used in gasoline engines while Diesel cycle is used in diesel engines.

Fourier law and Newton's law of cooling are both related to heat transfer.

• Fourier's law states that the rate of heat transfer through a material is proportional to the temperature gradient across the material.

• Newton's law of cooling states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings.

• Both laws are used in various fields such as engineering,...read more

GAIL operates in the natural gas, petrochemicals, LPG transmission, and liquid hydrocarbons sectors.

• Natural Gas

• Petrochemicals

• LPG Transmission

• Liquid Hydrocarbons

Transformer losses refer to the energy losses that occur during the operation of a transformer.

• Transformer losses include copper losses and iron losses.

• Copper losses occur due to the resistance of the transformer windings.

• Iron losses, also known as core losses, occur due to hysteresis and eddy currents in the transformer core.

• Copper losses can be minimized by using larger conductor sizes and reducing the resistance of ...read more

Efficiency of transformer is the ratio of output power to input power.

• Efficiency is affected by factors such as core losses, winding resistance, and load impedance.

• Efficiency can be improved by using high-quality materials, proper design, and regular maintenance.

• Efficiency is expressed as a percentage and can range from 50% to 99% depending on the transformer type and application.

Non-sparking equipment and lights are used in hazardous environments to prevent explosions.

• Non-sparking tools are made of materials that do not create sparks when struck or rubbed against each other.

• Non-sparking lights use LED technology and are enclosed in a housing that prevents sparks from escaping.

• These techniques are commonly used in industries such as oil and gas, chemical, and mining.

• Examples of non-sparking too...read more