Steam Propulsion Systems Quiz

Which of the following properties cannot be directly obtained from a steam table? Select the correct response:

• specific volume

• enthalpy

• entropy

• thermal conductivity

In the ideal Diesel cycle, the cut-off ratio is defined as the ratio of: Select the correct response:

• V1/V2

• V3/V1

• V3/V2

• V4/V1

What is the range of values the dryness fraction can take for wet steam? Select the correct response:

• 0 to 10

• 0 to 1

• Greater than 1

• 1 to 100

How does the calorific value of fuel influence the steam production process aboard ships? Select the correct response:

• Higher calorific value fuels require higher steam temperatures

• Lower calorific value fuels reduce steam pressure

• Higher calorific value fuels lead to increased steam production

• Lower calorific value fuels decrease steam turbine efficiency

What role does the calorific value of fuel play in determining the efficiency of heat transfer processes aboard ships? Select the correct response:

• Higher calorific value fuels decrease thermal efficiency

• Higher calorific value fuels result in higher exhaust gas temperatures

• Lower calorific value fuels influence the rate of steam generation

Which law relates the pressure and temperature of a gas at constant volume? Select the correct response:

• Charles's Law

• Boyle's Law

• Avogadro's Law

• Gay-Lussac's Law

In the Rankine cycle, what is the function of the steam turbine? Select the correct response:

• To compress steam into superheated vapor

• To expand steam and convert thermal energy into mechanical work

• To increase the temperature of water

• To condense steam into water

1 Point Steam at a certain boiler pressure has the following properties from steam tables: Enthalpy of saturated liquid water hf=640 kJ/kg; Enthalpy of vaporization hfg=2000 kJ/kg, If the enthalpy of the wet steam is h=1640 kJ/kg, determine the steam quality. Select the correct response:

• 0.50

• 0.60

• 0.75

• 0.80

The main thermodynamic goal of the Miller cycle compared to the Diesel and Otto cycles is to: Select the correct response:

• Increase combustion pressure

• Remove the need for intercooling

• Improve thermal efficiency by reducing compression work

• Delay power stroke

A steam sample has a dryness fraction of 0.85. What does this indicate? Select the correct response:

• The steam is fully saturated

• 85% of the steam is superheated vapor

• 85% of the mixture's mass is in liquid form and 15% is vapor

• 85% of the mixture's mass is in vapor form and 15% is liquid