Unit 16- Prime Movers And Engines Practise Flashcards
When deciding on the energy design of the plant, one of the following would not be of concern
- ) type of fuel being burned
- ) equipment costs
- ) who are the customers
- ) system efficiency
- ) the environment
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The cross head of a steam engine
Imparts linear motion to the piston rod
When checking bearings on running pieces of equipment it is wise to.
Get accustomed to normal operating temperature and vibration by touching equipment parts, such as bearings, lube oil, and cooling water returns
The reciprocating motion of a steam engine is converted to rotary motion:
At the crankshaft
A routine inspection of an operating steam engine should cover first and foremost.
Lubricators
A steam engine will have the steam supply to the cylinder shut off once the piston has travelled
25- 35% of its stroke
A steam engine piston
Moves fastest at the beginning of its stroke
One of the first ways to detect fault in a reciprocating engine is
Sound
A steam turbines exhaust can often supply a process with steam because
It is free of oil
Turbines often have segmental carbon ring sealing glands held in place by:
Garter springs
Turbine thrust bearings are fixed to the casing and prevent axial movement of the spindle by contracting a component on the shaft known as a
Collar
A large reaction turbine will have
Steam pressure dropping through moving and stationary sections
Turbine speed can be fine tuned with a device which will be limited to about 10% over the rated speed. The device is the
Hand speed control
The great majority of steam turbine governing systems utilize the
Mechanical centrifugal principle
A typical overspeed trip setting for a mechanical drive steam turbine will be
15% above normal speed
When the steam pressure drops occurs in only the stationary members or components of a turbine, the turbine is known as a/an:
Impulse unit
A steam turbine should trip or shutdown when normal operating speed is exceeded by
10-15%
Shaft sealing carbon glands are:
Self lubricating
Excessive wind velocity in a natural draft cooling towers may cause
High water drift or losses
A cooling tower which requires neither fan nor fill is the
Venturi unit
To prevent cooling tower basin water from freezing during cold weather many units are equipped with
Electric heating basins
Scaling is not as severe in cooling towers as it is in boilers because
Temperature is not as high
Natural draft cooling tower operate most efficiently in large open spaces and
Where wind is relatively constant
Water contained in the air stream at the discharge of a mechanical draft cooling tower is removed
With drift eliminators
