Power Engineering 3A1 Review Questions And Answers With Solutions
.
1. A: A butane molecule is a straight chain hydrocarbon molecule with the
following chemical formula: Select one:
A. C4H10
B. C3H8
C. C3H10
D. C4H8
E. C3H10
2. D: Reflex angles are greater than:
Select one:
A. 45 degrees
B. 90 degrees
C. 120 degrees
D. 180 degrees
E. 270 degrees.
3. B: A word that refers to the change in the position of a body, relative to
some reference point is: Select one:
A. Magnitude
B. Displacement
C. Direction
D. DistanceE. Velocity
4. B: Correct term for any change of phase from a liquid to a vapor is:
Select one:
A. Boiling
B. Evaporation
C. Boiling point
D. Vaporization
E. Fusion
5. D: Boyle's Law is one of constant:
Select one:
A. Mass
B. Volume
C. Pressure
D. Temperature E. Flow
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
6. A: A steam engine has a piston 20 cm in diameter and a piston rod of 4 cm
diameter. If the ultimate strength for the rod material is 400,000 kPa and the factor
of safety for the rod is 12 then calculate the maximum allowable steam pressure.
Select one:
A. 1,333 kPa
B. 1.333 GPa
C. 3333 kPa
D. 6031.87 kPa
E. 192,000 kPa
7. A: If 1.45 m³ of air at 100 kPa abs and 12°C is compressed to 950 kPa abs while
following the law PV1.34 = C. Taking R for air = 0.287 kJ/kg K, find the final volume
of air and the mass of air compressed.
Select one:
A. V2 = 0.27 m³ and mass = 1.77 kg
B. V2 = 0.42 m³ and mass = 3.55 kg
C. V2 = 0.27 m³ and mass = 42.1 kgD. V2 = 0.42 m³ and mass = 57.5 kg
E. V2 = 0.42 m³ and mass = 42.1 kg
8. D: The amount of heat required to convert 10 kg of water at 60°C into dry
saturated steam at 200 kPa is:
Select one:
A. 2455.57 kJ
B. 2511.3 kJ
C. 2706.7 kJ
D. 24,555.7 kJ
E. 27,067 kJ
9. A: In the following triangle, what is the value of tan A
? Select one:
A. 1.33
B. 0.80
C. 0.75
D. 0.6
E. 1.67
10. C: 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 100°C from water at
100°C is called the:
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
Select one:
A. Dryness fraction
B. Equivalent evaporation
C. Factor of evaporation
D. Efficiency of steam generation
E. Latent heat of fusion
11. C: In the given triangle, calculate the ratio of BC to AC, when angle ADC = 40
degrees, angle BDC = 20 degrees, angle ACD = 90 degrees, and side DC = 8m.
Select one:
A. 0.351
B. 0.362
C. 0.434D. 0.474
E. 0.5.
12. D: Generally, the boiling point of a hydrocarbon compound will:
Select one:
A. Decrease with increased carbon chain length and increase with increased
branch-ing
B. Decrease with increased carbon chain length and decrease with increased
branching
C. Increase with increased carbon chain length and increase with increased
branch-ing
D. Increase with increased carbon chain length and decrease with increased
branch-ing
E. Remain constant over all chain lengths and branches
13. B: The internal resistance to an external force applied to a body is known as:
Select one:
A. Strain
B. Stress
C. Young's Modulus
D. Ultimate strength
E. Allowable strength
14. D: A 110 m long mild steel pipe in a refinery conveys oil at a maximum
temperature of 140°C. In winter the plant is shut down, and the temperature of the
pipeline drops to -25°C. Calculate the amount of shrinkage of the pipe. Select one:
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
A. 0.151 8 cm
B. 0.217 8 cm
C. 15.18 cm
D. 21.78 cm
E. 65.34 cm
15. B: The main method(s) to control or eliminate oxygen accelerated corrosion in
the water-side of the boiler is to:
1. Preheat the boiler feed water to 250°C to cause the oxygen to separate out
from the water
2. Mechanically remove the oxygen from the feed-water in the deaerator before
sending it to the boiler
3. Maintain a correct residual of oxygen scavenger chemicals in the boiler water
4. Trap the oxygen in the steam traps and vent it to atmosphere Select one:
A. 1, 2
B. 2, 3
C. 3, 4
D. 1, 3
E. 1, 4
16. E: Radiant energy waves are:
Select one:
A. Able to pass through a vacuum
B. Those that travel in straight lines
C. Absorbed, reflected or transmitted by other bodies
D. Absorbed and converted into heat
E. All of the above
17. D: To "expand a gas" means the gas is:
Select one:
A. Always at constant volume
B. Always at constant pressure
C. Always at constant temperature
D. Able to perform useful work
E. Required to have work preformed on it
18. D: If the amount that a bolt is stretched when subjected to a load is divided by
the original length, the ratio found is classed as:
.
1. A: A butane molecule is a straight chain hydrocarbon molecule with the
following chemical formula: Select one:
A. C4H10
B. C3H8
C. C3H10
D. C4H8
E. C3H10
2. D: Reflex angles are greater than:
Select one:
A. 45 degrees
B. 90 degrees
C. 120 degrees
D. 180 degrees
E. 270 degrees.
3. B: A word that refers to the change in the position of a body, relative to
some reference point is: Select one:
A. Magnitude
B. Displacement
C. Direction
D. DistanceE. Velocity
4. B: Correct term for any change of phase from a liquid to a vapor is:
Select one:
A. Boiling
B. Evaporation
C. Boiling point
D. Vaporization
E. Fusion
5. D: Boyle's Law is one of constant:
Select one:
A. Mass
B. Volume
C. Pressure
D. Temperature E. Flow
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
6. A: A steam engine has a piston 20 cm in diameter and a piston rod of 4 cm
diameter. If the ultimate strength for the rod material is 400,000 kPa and the factor
of safety for the rod is 12 then calculate the maximum allowable steam pressure.
Select one:
A. 1,333 kPa
B. 1.333 GPa
C. 3333 kPa
D. 6031.87 kPa
E. 192,000 kPa
7. A: If 1.45 m³ of air at 100 kPa abs and 12°C is compressed to 950 kPa abs while
following the law PV1.34 = C. Taking R for air = 0.287 kJ/kg K, find the final volume
of air and the mass of air compressed.
Select one:
A. V2 = 0.27 m³ and mass = 1.77 kg
B. V2 = 0.42 m³ and mass = 3.55 kg
C. V2 = 0.27 m³ and mass = 42.1 kgD. V2 = 0.42 m³ and mass = 57.5 kg
E. V2 = 0.42 m³ and mass = 42.1 kg
8. D: The amount of heat required to convert 10 kg of water at 60°C into dry
saturated steam at 200 kPa is:
Select one:
A. 2455.57 kJ
B. 2511.3 kJ
C. 2706.7 kJ
D. 24,555.7 kJ
E. 27,067 kJ
9. A: In the following triangle, what is the value of tan A
? Select one:
A. 1.33
B. 0.80
C. 0.75
D. 0.6
E. 1.67
10. C: 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 100°C from water at
100°C is called the:
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
Select one:
A. Dryness fraction
B. Equivalent evaporation
C. Factor of evaporation
D. Efficiency of steam generation
E. Latent heat of fusion
11. C: In the given triangle, calculate the ratio of BC to AC, when angle ADC = 40
degrees, angle BDC = 20 degrees, angle ACD = 90 degrees, and side DC = 8m.
Select one:
A. 0.351
B. 0.362
C. 0.434D. 0.474
E. 0.5.
12. D: Generally, the boiling point of a hydrocarbon compound will:
Select one:
A. Decrease with increased carbon chain length and increase with increased
branch-ing
B. Decrease with increased carbon chain length and decrease with increased
branching
C. Increase with increased carbon chain length and increase with increased
branch-ing
D. Increase with increased carbon chain length and decrease with increased
branch-ing
E. Remain constant over all chain lengths and branches
13. B: The internal resistance to an external force applied to a body is known as:
Select one:
A. Strain
B. Stress
C. Young's Modulus
D. Ultimate strength
E. Allowable strength
14. D: A 110 m long mild steel pipe in a refinery conveys oil at a maximum
temperature of 140°C. In winter the plant is shut down, and the temperature of the
pipeline drops to -25°C. Calculate the amount of shrinkage of the pipe. Select one:
, Power Engineering 3A1 Review Questions And Answers With Solutions
.
A. 0.151 8 cm
B. 0.217 8 cm
C. 15.18 cm
D. 21.78 cm
E. 65.34 cm
15. B: The main method(s) to control or eliminate oxygen accelerated corrosion in
the water-side of the boiler is to:
1. Preheat the boiler feed water to 250°C to cause the oxygen to separate out
from the water
2. Mechanically remove the oxygen from the feed-water in the deaerator before
sending it to the boiler
3. Maintain a correct residual of oxygen scavenger chemicals in the boiler water
4. Trap the oxygen in the steam traps and vent it to atmosphere Select one:
A. 1, 2
B. 2, 3
C. 3, 4
D. 1, 3
E. 1, 4
16. E: Radiant energy waves are:
Select one:
A. Able to pass through a vacuum
B. Those that travel in straight lines
C. Absorbed, reflected or transmitted by other bodies
D. Absorbed and converted into heat
E. All of the above
17. D: To "expand a gas" means the gas is:
Select one:
A. Always at constant volume
B. Always at constant pressure
C. Always at constant temperature
D. Able to perform useful work
E. Required to have work preformed on it
18. D: If the amount that a bolt is stretched when subjected to a load is divided by
the original length, the ratio found is classed as:
