POWER ENGINEERING 3A1 REVIEW QUESTIONS & ANSWERS

POWER ENGINEERING 3A1 REVIEW QUESTIONS &
ANSWERS
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


D
Reflex angles are greater than:
Select one:
A. 45 degrees
B. 90 degrees
C. 120 degrees
D. 180 degrees
E. 270 degrees.




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


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


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:
Select one:
A. Dryness fraction
B. Equivalent evaporation
C. Factor of evaporation
D. Efficiency of steam generation
E. Latent heat of fusion


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. 0.434
D. 0.474
E. 0.5.


D
Generally, the boiling point of a hydrocarbon compound will:
Select one:

,A. Decrease with increased carbon chain length and increase with increased branching
B. Decrease with increased carbon chain length and decrease with increased branching
C. Increase with increased carbon chain length and increase with increased branching
D. Increase with increased carbon chain length and decrease with increased branching
E. Remain constant over all chain lengths and branches


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. Distance
E. Velocity


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


D
Boyle's Law is one of constant:
Select one:
A. Mass
B. Volume
C. Pressure
D. Temperature
E. Flow


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


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 kg
D. V2 = 0.42 m³ and mass = 57.5 kg
E. V2 = 0.42 m³ and mass = 42.1 kg

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


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:
A. 0.151 8 cm
B. 0.217 8 cm
C. 15.18 cm
D. 21.78 cm
E. 65.34 cm


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