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G-92 STUDY MATERIAL 2024 WITH100- CORRECT ANSWERS
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G-92 STUDY MATERIAL 2024 WITH100- CORRECT ANSWERS
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10/18/24, 10:22 AMScience Engineering Electrical Engineering
G-92 STUDY MATERIAL 2024 WITH100% CORRECT
ANSWERS
Terms in this set (99)
What does natural gas primarily consist of? Methane
Before natural gas can be used as a fuel it Methane
must undergo extensive processing to
remove almost all materials other than
what?
The methane content can range from what 87% to 96%
percentages?
Processed natural gas is _________ and ______ ? Tasteless and odorless
Before gas is distributed to end-users, it is Odorants
odorized by adding small amounts of
what?
What do the small odorants in gas assist Leak detection
with?
Natural gas is a ______ gas. Flammable
Natural gas is lighter than ___? Air
The specific gravity of natural gas is? 0.60
The specific gravity of air is? 1.00
Natural gas rises and tends to escape into The atmosphere
where?
Methane has a lower explosive limit of how 5%
much in air?
Methane has an upper explosive limit of 15%
how much?
The lower and upper explosive limits are Lower flammable limit and upper flammable limit
sometimes referred as what?
G-92 STUDY MATERIAL
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, 10/18/24, 10:22 AM
Natural gas's autoignition temperature in air 998F or 537C
is ___ F, or ___ C.
Any natural gas leak shall be regarded as a Serious hazard, immediate response
_______ ______ that requires _________ ________
Microturbines can be used in electricity- Synchronous heat and power, or CHP
only generation, or to produce both heat
and electricity, which is referred to as
___________ ____ and , or ___.
Microturbines are small combustion 25kW to 500kW
turbines approximately the size of a
refrigerator with outputs of ____ to ____
Most microturbines are comprised of Compressor, Combustor, Alternator, Turbine, Electric generator and a Recuperator.
what? (Think CCATER)
A _______ is a device that captures waste Recuperator
heat to improve the efficiency.
The construction complexity of Output and efficiency
microturbine systems varies based on ______
and ______ characteristics.
Microturbine systems can be divided into Two
how many general classes?
What are the names of the two general Un-recuperated and recuperated
classes of microturbine systems?
What kind of microturbines have lower Unrecuperated (simple cycle)
efficiencies at around 15%?
Which system provides more heat available Recuperated
for cogeneration applications?
Recuperated or un-recuperated units?
The fuel energy to electrical-conversion 20% to 30%
efficiencies are in the range of what?
Recuperated units can produce ___ to ___ 30% to 40%
fuel savings from preheating.
Microturbines operate on either ___ __________ Oil lubricated or air bearings
or ________, which support the shaft(s).
Mechanical bearings that come in three Oil lubricated bearings
main types are?
What are the three main types of oil High speed metal roller, floating sleeve, ceramic surface
lubricated bearings?
Of the three main types of oil lubricated Ceramic surface
bearings, which one provides the longest
life, operating temperature and lubricant
flow?
These kind of bearings do not require any Air bearings
oil or oil pump. What are they?
Air bearings permit_______ operations High speed, low vibration
while operating with very ________ levels.
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