power prep quiz 5

Description

power engineering 3b2 Quiz on power prep quiz 5, created by TRAVIS CANNING on 27/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING almost 9 years ago
7
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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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