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power prep quiz #8

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power engineering 3b2 Quiz on power prep quiz #8, created by TRAVIS CANNING on 28/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING over 8 years ago
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Resource summary

Question 1

Question
A dual shaft gas turbine has the following advantages 1. flexability in system configuration 2. lower first cost 3. smaller starting motors 4. higher operating pressures
Answer
  • 1,2
  • 1,3
  • 1,4
  • 2,3
  • 3,4

Question 2

Question
A gas turbine that uses an intercooler during compression
Answer
  • has it located prior to compression
  • is located after the compressor but before the combustor
  • has a higher power output at the turbine
  • requires a larger starting motor
  • all of the above

Question 3

Question
Intercoolers are used on a gas turbine compressors to:
Answer
  • reduce the specific volume of the air
  • increase the dewpoint of the air
  • remove the moisture from the air
  • increase the combustor efficiency
  • increase compressor life

Question 4

Question
A reheater in a gas turbine cycle will: 1. compress more air 2. allow for smaller turbine blades 3. allow for a smaller combustor 4. improve the cycle efficiency 5. will require less air for the same turbine output
Answer
  • 2,3,4
  • 4,5
  • 1,3,5
  • 2,4
  • 1,2,3,4,5

Question 5

Question
A regenerator in a gas turbine cycle is also referred to as:
Answer
  • heat exchanger
  • cyclone
  • duct burner
  • intercooler
  • safety device

Question 6

Question
A gas turbine 1. is a hot air engine 2. has a pressure ratio of 30 - 1 3. always use axial air compressors 4. uses a lower density working medium
Answer
  • 1,2
  • 2,3
  • 3,4
  • 1,4
  • 2,4

Question 7

Question
The flow of air and shaft speed of a gas turbine are fairly constant which results in _____________power outputs per unit weight.
Answer
  • constant
  • very high
  • proportional
  • comparable
  • efficient

Question 8

Question
A gas turbine is designed with the simplicity of a/an ________ and the advantages of a ______________.
Answer
  • steam turbine, internal combustion engine
  • air compressor, diesel engine
  • steam engine, locomotive boiler
  • fuel cell, wind turbine
  • rocket ship, airplane

Question 9

Question
In a gas turbine cycle the phrase Total energy Arrangement means:
Answer
  • it is a closed cycle system therefore all energy is contained within the system
  • the system is based on purely theoretical calculations if all the energy was accounted for in the system
  • the turbine provides all the necessary forms of energy
  • the exhaust gases from the GT are passed through a HRSG to produce steam
  • the gas turbine uses exhaust gas from a boiler as combustion air for the combustor

Question 10

Question
A gas turbine arrangement employing the total energy arrangement may be used to provide 1. air conditioning 2. heating 3. electricity 4. cool drinking water
Answer
  • 1,2,3
  • 2,3,4
  • 1,2,4
  • 1,2,3,4

Question 11

Question
The disadvantage of a closed cycle gas turbine include: 1. higher initial cost 2. more space is required 3. more cooling water needed 4. more components needed
Answer
  • 1,2,3
  • 2,3,4
  • 1,3,4
  • 1,2,4
  • 1,2,3,4

Question 12

Question
The regenerator in a gas turbine system gets its heat from:
Answer
  • compressor outlet
  • combustor bypass
  • aux. firing
  • power turbine exhaust
  • a separate heat exchanger

Question 13

Question
Regenerator disadvantages include 1. pressure drop 2. temperature drop 3. fouling of heating surfaces 4. needs a large heating surface
Answer
  • 1,2,3
  • 2,3,4
  • 1,3,4
  • 1,2,4
  • 1,2,3,4

Question 14

Question
using an intercooler in a gas turbine system will 1. create more power 2. lowers the airs specific volume 3. raise the 2nd stage air temp 4. drop some moisture from the air
Answer
  • 1,2,3
  • 2,3,4
  • 1,3,4
  • 1,2,3,4
  • 1,2,4

Question 15

Question
initial ignition in a gas turbine combustor is accomplished using
Answer
  • glow plug
  • high voltage plug
  • hot air from the compressor discharge
  • static friction
  • continuous pilot flame

Question 16

Question
The function of the combustor is to
Answer
  • burn fuel with excess air
  • increase the kinetic energy of the working fluid
  • increase the compressed air pressure
  • lower NOx emmisions
  • increase the airs specific volume

Question 17

Question
The _________ on a gas turbine can be driven by the load turbine
Answer
  • starting motor
  • aux oil system
  • combustor
  • air compressor
  • power turbine

Question 18

Question
A gas turbine compressor may be ________ by design
Answer
  • axial or reciprocating
  • screw or radial
  • impulse or reaction
  • radial or axial
  • all of the above

Question 19

Question
Axial air compressor blades are commonly made from 1. aluminum 2. brass 3. titanium 4. stainless steel
Answer
  • 1,2
  • 3,4
  • 1,3
  • 2,4
  • 1,2,3,4

Question 20

Question
Gas turbine casings are usually made from:
Answer
  • aluminum alloy or cast iron
  • stainless steel or titanium
  • brass or bronze
  • alloy steel or inconel
  • none of the above

Question 21

Question
The compressor in a gas turbine has to pressurize the air to supply:
Answer
  • air to cool the turbine
  • air for expansion in the turbine
  • air for combustion and further expansion through the turbine
  • air to the combustor for cooling
  • air to provide exhaust gas for a HRSG

Question 22

Question
The compressor in a gas turbine system uses up to _________ of the energy supplied by the fuel
Answer
  • 10%
  • 25%
  • 50%
  • 66%
  • 75%
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