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Steam Properties and Boiler Efficiency Practice Questions, Exams of Engineering

Abilene Christian University (ACU)Engineering

Practice questions on steam properties and boiler efficiency test thermodynamics understanding. Topics include latent heat, dryness fraction, equivalent evaporation, and steam tables. Calculations involve enthalpy, heat transfer, and steam behavior, valuable for thermal engineering students. Multiple-choice questions assess key concepts and formulas, reinforcing learning and exam preparation. Questions range in difficulty, suitable for introductory and advanced learners. Material is clear and concise, focusing on applying thermodynamic principles to real-world scenarios. A useful tool for self-assessment and exam preparation, helping students master steam properties and boiler efficiency, relevant for mechanical, chemical engineering, and related disciplines.

Typology: Exams

2024/2025

Available from 08/06/2025

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3A1 Chapter 10 Practice Questions correctly answered 100% 2025-
2026
1 /
13
1. B. All its
latent heat
2. C. Factor of
evap- oration
3. C. Dry
saturated steam
4. A. Factor of evap-
oration times the
actual steam flow
(kg/h)
Dry saturated steam is steam saturated with
.
A.Water
B. All its latent heat
C. A percentage of "hfg"
D.Sensible heat
E. A percentage of "hf"
The ratio of the amount of heat absorbed per kg of
steam in the boiler, to the amount of heat
absorbed in producing 1 kg of steam at 100C from
water at 100C is called the:
A. Dryness fraction
B. Equivalent evaporation
C. Factor of evaporation
D.Efficiency of steam generation
E. Latent heat of fusion
Referring to the diagram below, the point marked
as 3 represents
A. Superheated steam
B.Wet saturated steam
C. Dry saturated steam
D.Boiling water
E. Critical point
Equivalent evaporation is determined by:
A.Factor of evaporation times the actual steam
flow (kg/h)
B. Factor of evaporation times net heat added per
pf3
pf4
pf5
pf8
pf9
pfa
pfd

Partial preview of the text

Download Steam Properties and Boiler Efficiency Practice Questions and more Exams Engineering in PDF only on Docsity!

1 /

  1. B. All its latent heat
  2. C. Factor of evap- oration
  3. C. Dry saturated steam
  4. A. Factor of evap- oration times the actual steam flow (kg/h) Dry saturated steam is steam saturated with . A. Water B. All its latent heat C. A percentage of "hfg" D.Sensible heat E. A percentage of "hf" The ratio of the amount of heat absorbed per kg of steam in the boiler, to the amount of heat absorbed in producing 1 kg of steam at 100C from water at 100C is called the: A. Dryness fraction B. Equivalent evaporation C. Factor of evaporation D.Efficiency of steam generation E. Latent heat of fusion Referring to the diagram below, the point marked as 3 represents A. Superheated steam B.Wet saturated steam C. Dry saturated steam D.Boiling water E. Critical point Equivalent evaporation is determined by: A. Factor of evaporation times the actual steam flow (kg/h) B. Factor of evaporation times net heat added per

2 / kg C. Actual evaporation divided by the factor of evaporation D.Factor of evaporation times the volume of steam gener-

4 / C. Equivalent evaporation

5 / D.Total enthalpy E. Latent heat of the transformation

  1. D. Boiling water Referring to the diagram below, the point marked as 2 represents: A. Superheated steam B.Wet steam C. Dry saturated steam D.Boiling water E. Critical point
  2. B. 60.5% A boiler generates 8 kg of dry saturated steam per kg of fuel oil burned. Fuel oil heating value is 33 000 kJ/kg. Feedwater is supplied at 70C, and the boiler pressure is 1400 kPa. Calculate the boiler A. 57.3% B. 60.5% C. 74.7% D.85.0% E. 92.3%
  3. C. 11,436 kJ Five kilograms of water at 100C is changed to saturated steam having a final temperature of 120C. Calculate the total amount of heat required in changing the water to steam. A. 2287.26 kJ B. 2706.3 kJ C. 11,436 kJ D.13,531.5 kJ E. 17,138 kJ

7 /

16. E.

Saturated steam D. 10994.2 kJ E. 2804.2 kJ Steam at the temperature of evaporation corresponding to the pressure is, by definition: A. Wet steam B. Superheated steam C. Dry steam D.Sub-cooled steam E. Saturated steam

  1. A. 649.6C How many degrees of superheat are there in steam at 4000 kPa and 900C? A. 649.6C B. 250.4C C. 900C D.263.99C E. 445.8C
  2. C. Equivalent evaporation The mass of water that would be evaporated in one hour, from feedwater at 100C into dry saturated steam at 100C, by the same amount of heat that is required, per hour, to produce steam at the actual boiler condition is called the: A. Heat rate B. Factor of evaporation C. Equivalent evaporation D.Total enthalpy E. Latent heat of the transformation
  3. E. 14190 kg/hr If a boiler has a factor of evaporation of 1.075 and its actual flow rate is 220 kg/min, calculate the equivalent evaporation in kg/hr. A. 32871 kg/hr

8 / B. 13200 kg/hr C. 12279 kg/hr

10 / temperature as saturated steam

11 / D.Has a volume equal to that of saturated steam E. All of the above

  1. A. Latent heat Heat supplied or taken away from a substance that causes a change of state without a change in temperature is called: A. Latent heat B. Sensible heat C. Convective heat D.Accumulated heat E. Evaporative heat
  2. E. Latent heat Steam with a percentage of wetness is said to have insuf- ficient: A. Temperature B. Sensible heat C. Total enthalpy D.Internal energy E. Latent heat
  3. C. 91% If the enthalpy of each kg of steam is only 2650.3 kJ and the pressure is 4000 kPa, calculate the dryness fraction. A. 95% B. 75% C. 91% D.89% E. 82%
  4. D. 2294.45 kJ What is the enthalpy of 75% dry steam at 1300 kPa? A. 1720.84 kJ B. 2090.7 kJ C. 2787.6 kJ D.2294.45 kJ E. 1972.7 kJ

13 / C. Causes a rise in temperature

  1. D. Saturation temperature
  2. A. Superheated steam Addition of sensible heat to a substance: A. Results in a change of state from solid to liquid B. Cannot be read on a thermometer C. Causes a rise in temperature D.Is the sum of the latent heat plus heat of evaporation E. Results in a change of phase from liquid to vapor Superheated steam is steam at a certain pressure, which temperature is above the: A. Combustion gas temperature B. Radiant steam temperature C. Fusion temperature D.Saturation temperature E. Critical temperature Referring to the diagram below, the point marked as 4 represents: A. Superheated steam B.Wet steam C. Dry saturated steam D.Boiling water E. Critical point