Quiz 2

For a simple Rankine cycle as condenser pressure decreases

• pump work remains the same

• heat supplied increases

• cycle efficiency improves

• moisture content increases

• all of the above

A reheat Rankine cycle has

• two constant pressure heat additions

• one constant pressure heat addition and two isentropic expansions

• two isentropic heat additions

• two constant pressure heat additions and two isentropic pumping

• none of the above

Which component is essential for the isentropic expansion in a Rankine cycle?

• Boiler

• Heat exchanger

• Condenser

• Pump

• Turbine

What is the main advantage of using a reheat Rankine cycle compared to a simple Rankine cycle?

• None of the above

• Increased fuel consumption

• Reduced size of equipment

• Lower operational costs

• Higher thermal efficiency

What is the primary function of the condenser in a Rankine cycle?

• To increase the temperature of the steam

• To pump the water back to the boiler

• To convert liquid water into steam

• To mix the steam with feed water

• To remove heat from the steam

Which of the following statements is true regarding the efficiency of a Rankine cycle?

• It decreases with higher condenser temperatures

• None of the above

• It is always greater than 50%

• It can be improved by increasing the boiler pressure

The minimum quality at the exit of the turbine in a reheat Rankine cycle in % should be

• 90 %
• less than 90%

• greater than 90%

• none of the above

Which of the following statements is true regarding the thermal efficiency of a Rankine cycle?

• It is always lower than that of a Carnot cycle

• It is independent of the working fluid used

• It decreases with increasing temperature of the heat source

• It can be improved by increasing the boiler pressure

• All of the above

Which is the correct sequence in a reheat Rankine cycle?

• Boiler - HPT - LPT - Condenser- Pump

• LPT - HPT - Condenser - Pump - Boiler

• Boiler - HPT - Boiler - LPT - Condenser _ Pump

• None of the above

• HPT - Boiler - LPT - Condenser- Pump

Consider a simple Rankine cycle with fixed turbine inlet temperature and condenser pressure. If the boiler pressure is increased

• Pump work decreases

• Heat supplied increases

• Moisture content at turbine exit decreases

• Net work output decreases

• All of the above