Problems on Reheated cycles and Regenerative cycles

What is the purpose of an Open Feedwater Heater in a power cycle?

• To reduce the overall efficiency of the cycle

• To increase the pressure in the turbine

• To cool down the water before it enters the boiler

• To preheat water before it enters the boiler and increase overall efficiency of the cycle.

Explain the concept of a Closed Feedwater Heater in a power cycle.

• A Closed Feedwater Heater cools down water before it enters the boiler, reducing cycle efficiency.

• A Closed Feedwater Heater is used to extract steam from the boiler and release it into the environment.

• A Closed Feedwater Heater is a device that increases the pressure of water in the power cycle.

• A Closed Feedwater Heater preheats water using extracted steam from the turbine before it enters the boiler, improving cycle efficiency.

How is Regenerator Effectiveness defined in the context of thermodynamics?

• Temperature difference between the hot and cold streams in a regenerator

• Efficiency of a regenerator in a closed system

• Ratio of actual heat transfer to maximum possible heat transfer

• Amount of heat transferred in a regenerator

Calculate the Reheat Cycle Efficiency if the initial cycle efficiency is 30% and the reheat factor is 0.5.

• 0.75

• 0.55

• 0.45

• 0.65

Discuss the advantages of using a regenerative cycle in power plants.

• Increased efficiency and reduced fuel consumption.

• Decreased efficiency and increased fuel consumption.

• No impact on efficiency or fuel consumption.

• Higher maintenance costs and longer downtime.