TRAVIS CANNING
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power engineering 3b2 Quiz on power prep quiz #8, created by TRAVIS CANNING on 28/02/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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power prep quiz #8

Question 1 of 22

1

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

Select one of the following:

  • 1,2

  • 1,3

  • 1,4

  • 2,3

  • 3,4

Explanation

Question 2 of 22

1

A gas turbine that uses an intercooler during compression

Select one of the following:

  • 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

Explanation

Question 3 of 22

1

Intercoolers are used on a gas turbine compressors to:

Select one of the following:

  • 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

Explanation

Question 4 of 22

1

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

Select one of the following:

  • 2,3,4

  • 4,5

  • 1,3,5

  • 2,4

  • 1,2,3,4,5

Explanation

Question 5 of 22

1

A regenerator in a gas turbine cycle is also referred to as:

Select one of the following:

  • heat exchanger

  • cyclone

  • duct burner

  • intercooler

  • safety device

Explanation

Question 6 of 22

1

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

Select one of the following:

  • 1,2

  • 2,3

  • 3,4

  • 1,4

  • 2,4

Explanation

Question 7 of 22

1

The flow of air and shaft speed of a gas turbine are fairly constant which results in _____________power outputs per unit weight.

Select one of the following:

  • constant

  • very high

  • proportional

  • comparable

  • efficient

Explanation

Question 8 of 22

1

A gas turbine is designed with the simplicity of a/an ________ and the advantages of a ______________.

Select one of the following:

  • steam turbine, internal combustion engine

  • air compressor, diesel engine

  • steam engine, locomotive boiler

  • fuel cell, wind turbine

  • rocket ship, airplane

Explanation

Question 9 of 22

1

In a gas turbine cycle the phrase Total energy Arrangement means:

Select one of the following:

  • 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

Explanation

Question 10 of 22

1

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

Select one of the following:

  • 1,2,3

  • 2,3,4

  • 1,2,4

  • 1,2,3,4

Explanation

Question 11 of 22

1

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

Select one of the following:

  • 1,2,3

  • 2,3,4

  • 1,3,4

  • 1,2,4

  • 1,2,3,4

Explanation

Question 12 of 22

1

The regenerator in a gas turbine system gets its heat from:

Select one of the following:

  • compressor outlet

  • combustor bypass

  • aux. firing

  • power turbine exhaust

  • a separate heat exchanger

Explanation

Question 13 of 22

1

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

Select one of the following:

  • 1,2,3

  • 2,3,4

  • 1,3,4

  • 1,2,4

  • 1,2,3,4

Explanation

Question 14 of 22

1

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

Select one of the following:

  • 1,2,3

  • 2,3,4

  • 1,3,4

  • 1,2,3,4

  • 1,2,4

Explanation

Question 15 of 22

1

initial ignition in a gas turbine combustor is accomplished using

Select one of the following:

  • glow plug

  • high voltage plug

  • hot air from the compressor discharge

  • static friction

  • continuous pilot flame

Explanation

Question 16 of 22

1

The function of the combustor is to

Select one of the following:

  • 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

Explanation

Question 17 of 22

1

The _________ on a gas turbine can be driven by the load turbine

Select one of the following:

  • starting motor

  • aux oil system

  • combustor

  • air compressor

  • power turbine

Explanation

Question 18 of 22

1

A gas turbine compressor may be ________ by design

Select one of the following:

  • axial or reciprocating

  • screw or radial

  • impulse or reaction

  • radial or axial

  • all of the above

Explanation

Question 19 of 22

1

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

Select one of the following:

  • 1,2

  • 3,4

  • 1,3

  • 2,4

  • 1,2,3,4

Explanation

Question 20 of 22

1

Gas turbine casings are usually made from:

Select one of the following:

  • aluminum alloy or cast iron

  • stainless steel or titanium

  • brass or bronze

  • alloy steel or inconel

  • none of the above

Explanation

Question 21 of 22

1

The compressor in a gas turbine has to pressurize the air to supply:

Select one of the following:

  • 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

Explanation

Question 22 of 22

1

The compressor in a gas turbine system uses up to _________ of the energy supplied by the fuel

Select one of the following:

  • 10%

  • 25%

  • 50%

  • 66%

  • 75%

Explanation

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