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
1,2
1,3
1,4
2,3
3,4
A gas turbine that uses an intercooler during compression
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
Intercoolers are used on a gas turbine compressors to:
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
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
2,3,4
4,5
1,3,5
2,4
1,2,3,4,5
A regenerator in a gas turbine cycle is also referred to as:
heat exchanger
cyclone
duct burner
intercooler
safety device
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
The flow of air and shaft speed of a gas turbine are fairly constant which results in _____________power outputs per unit weight.
constant
very high
proportional
comparable
efficient
A gas turbine is designed with the simplicity of a/an ________ and the advantages of a ______________.
steam turbine, internal combustion engine
air compressor, diesel engine
steam engine, locomotive boiler
fuel cell, wind turbine
rocket ship, airplane
In a gas turbine cycle the phrase Total energy Arrangement means:
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
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
1,2,3
1,2,4
1,2,3,4
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
1,3,4
The regenerator in a gas turbine system gets its heat from:
compressor outlet
combustor bypass
aux. firing
power turbine exhaust
a separate heat exchanger
Regenerator disadvantages include 1. pressure drop 2. temperature drop 3. fouling of heating surfaces 4. needs a large heating surface
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
initial ignition in a gas turbine combustor is accomplished using
glow plug
high voltage plug
hot air from the compressor discharge
static friction
continuous pilot flame
The function of the combustor is to
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
The _________ on a gas turbine can be driven by the load turbine
starting motor
aux oil system
combustor
air compressor
power turbine
A gas turbine compressor may be ________ by design
axial or reciprocating
screw or radial
impulse or reaction
radial or axial
Axial air compressor blades are commonly made from 1. aluminum 2. brass 3. titanium 4. stainless steel
Gas turbine casings are usually made from:
aluminum alloy or cast iron
stainless steel or titanium
brass or bronze
alloy steel or inconel
none of the above
The compressor in a gas turbine has to pressurize the air to supply:
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
The compressor in a gas turbine system uses up to _________ of the energy supplied by the fuel
10%
25%
50%
66%
75%
