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4671012
power prep quiz 5
Description
power engineering 3b2 Quiz on power prep quiz 5, created by TRAVIS CANNING on 27/02/2016.
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3b2
power engineering
Quiz by
TRAVIS CANNING
, updated more than 1 year ago
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TRAVIS CANNING
over 8 years ago
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Resource summary
Question 1
Question
A gas turbine compressor is usually
Answer
centrifugal type
downstream of the turbine
dynamic axial design
downstream of the combustor
driven by a motor
Question 2
Question
The compressor on the gas turbine
Answer
can be driven by the load turbine
is always of the axial type
is always a multi-staged compressor
is always independently driven
is always a reciprocating type
Question 3
Question
The combustion chamber of a gas turbine
Answer
increases the pressure of the compressed air
is heated between the load turbine and the compression turbine
burns fuel with excess air
is water cooled
rotates at shaft speed
Question 4
Question
Many typical steam plant auxiliaries are eliminated with a gas turbine due to its
Answer
small size
high speed
high power to weight ratio
simplicity
low oil consumption
Question 5
Question
Gas turbines are very popular where
Answer
noise does not present a problem
water is scarce
industrial sites are small and in congested areas
thermal pollution is of major concern
natural gas is plentiful
Question 6
Question
gas turbines are ideal when considering
Answer
long warm-up periods
emergency power generation
automotive power
cooling water pump operation
good thermal efficiency
Question 7
Question
A two shaft gas turbine
Answer
has the load turbine downstream from the compressor turbine
has the first turbine drive the prop on a turbo-prop engine
is always an open cycle type
is always a closed cycle type
does not require a starting motor
Question 8
Question
A gas turbine is not self-starting. It must be rotated at _________ of its maximum speed before fuel is turned on
Answer
10% to 30 %
15% to 30 %
20% to 30 %
25% to 30 %
25% to 50%
Question 9
Question
Early gas turbines were handicapped by
Answer
metal not being able to withstand high speed centrifugal forces
the inability to get enough air into the combustion chamber
metals not standing the high temperatures involved
their high operating speeds
their inadequate power capability
Question 10
Question
The temperature to which the air can be raised at the turbine inlet is
Answer
an indication of a units power
directly related to the units size
a function of the air compressor input
an indication of the units efficiency
important for proper compressor performance
Question 11
Question
The low installation cost of a gas turbine is
Answer
due to cheap materials in the blades
due to short fuel lines
because no fuel pump is required
because no electrical wiring is required
because less auxillary equipment is needed
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