3-31. Hero’s turbine was invented long
before Newton’s time, but It was a
working model of Newton’s
1. first law of motion
2. second law of motion
3. third law of motion
4. fourth law of motion
3-32. What does a reaction turbine use to
drive the rotor?
1. The reaction of a steam jet
2. The reaction of a gas when
converted to a solid
3. The reaction of a water jet
4. The reaction of a rapid change in
steam temperature
3-33. What is generally stated in Newton’s
third law of motion?
1. For every action there must be an
equal and opposite reaction
2. Matter can be neither created nor
destroyed
3. The total quantity of energy in the
universe is always the same
4. At the molecular or submolecular
level, heat transfer takes place
through both the processes of
conduction and radiation
3-34. In a reaction turbine, the stationary
blades attached to the turbine casing
act as nozzles and direct the steam to
the
1. shaft
2. bearings
3. baffles
4. moving blades
3-35. When you let the air escape through
the small opening in a balloon, what
energy transformation is taking place?
1. Kinetic energy to potential energy
2. Potential energy to kinetic energy
3. Thermal energy to chemical energy
4. Mechanical energy to kinetic energy
3-36. A reaction turbine has all the
advantages of an Impulse-type
turbine, plus which of the following
features?
1. A slower operating speed
2. Greater efficiency
3. Both 1 and 2 above
4. A faster operating speed
3-37. For nonsuperheated applications,
turbine casings are made from which
of the following materials?
1. Cast carbon steel
2. Brass
3. Tin
4. Plastic
3-38. For superheated applications, turbine
casings are made from which of the
following materials?
1. Carbon molybdenum steel
2. Cast carbon steel
3. Brass
4. Cast iron
3-39. What is the primary purpose of a
turbine rotor?
1. To carry the moving blades that
convert the steam’s kinetic energy
to rotating mechanical energy
2. To convert mechanical energy to
potential energy
3. To carry the stationary blades
that convert the steam’s kinetic
energy to chemical energy
4. To convert kinetic energy to
hydraulic energy
3-40. The rotor of every turbine must be
positioned radially and axially by
what means?
1. Brushes
2. Wedges
3. Spaces
4. Bearings
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