WorksheetsSteam Power Plant
Total questions: 33
Worksheet time: 17mins
Which of the following factors does bursting pressure of boiler doesn't depend
Tensile strength of the shell
Thickness of the shell
Diameter of the shell
Shear strength of shell material
Which of the following factors does working pressure of boiler doesn't depend
Tensile strength of shell
Thickness of shell
Factor of safety
Type of fuel being fired
Total solid impurities in feed water for a boiler depend upon
boiler pressure
quantity of steam to be generated
type of fuel available
quantity of steam
A high pressure chamber or a device in which the paths of rapidly moving particles can be observed in photographed
Cloud chamber
Combustion chamber
Fission chamber
Air chamber
The formation of gas bubbles in a liquid is called
bubbling
foaming
priming
carryover
How many check valves should be provided between any feed pump and boiler
1
2
3
4
The water level inside the boiler is indicated by the
baffles
fusible plug
water walls
water column
What is the highest pressure under which distinguishable liquid in vapor phases can exist in equilibrium?
Maximum pressure
Atmosphere
Critical pressure
Peak pressure
What is the average fuel - oil temperature range of the oil in the discharge line to the boiler?
180 - 200°F
240 - 260 °F
160 - 180 °F
140 - 160 °F
The lowest permissible water level of a boiler without internal furnace is ___ the height of the shell.
1/2
1/3
1/4
1/5
In case of steam engine the cut off ratio is the ratio of
pressure at cut off to supply pressure
pressure at cut off to exhaust pressure
pressure of cut off to mean effective pressure
fraction of piston stroke which the piston traveled when cut off occurs
In a condensing steam engine
condensed stean is supplied
steam condenses inside the cylinder
steam condenses as soon as it leaves the cylinder
exhaust steam is condensed in a condenser
Flows through the nozzles and diffusers with increasing fluid velocity will create an equivalent
decrease in the static enthalpy of fluid
increase in the static enthapy of fluid
decrease in the internal enegy of the fluid
decrease in the dynamic enthalpy of fluid
The term V2/2cp responds to the temperature rise during such a process is called the
kinetic temperature
high temperature
dynamic temperature
elevation temperature
All of the following mechanism can supply heat to a thermodynamic system except
conduction
natural convection
adiabatic expansion
radiation
The flow through the nozzle is
isentropic
polytropic
isobaric
isovolumic
If the reservoir is sufficiently large, the nozzle inlet velocity is
maximum
negative
positive
zero
Which of the following is the pressure applied the nozzle discharge section
Stagnant pressure
Critical pressure
Back pressure
Atmospheric pressure
When the back pressure is reduced to lowest exit pressure, the mass flow reaches a maximum value and the flow is said to be
stacked
choked
stuck-up
clog-up
An increase in stagnation pressure will increase the max flux through the
diverging nozzle
converging nozzle
converging - diverging nozzle
none of these
A converging - diverging nozzle is the standard equipment in
subsonic aircraft
supersonic aircraft
hypersonic aircraft
trisonic aircraft
For back pressure valves, abruot changes in fluid properties occur in a very thin section of converging-diverging nozzle under supersonic flow conditions, creating
sound wave
tidal wave
shock wave
none of these
is the locus of states which have the same vakue of stagnation enthalpy and mass flux are called
Fanno Line
Straight Line
Willan's Line
Cross Cut Line
Combination of mass and momentum equationsinto single equation abd plotted in h-s plane yield a curve called
Fair Line
Freh Line
Cutting Line
Rayleigh Line
Generally steam turbines in power station operate at
3000 rpm
1000 rpm
4000 rpm
575 rpm
Which of the following shows the relationship of the steam consumption and the load of steam turbine - generator?
Dalton's Line
Willan's Line
Jonval's Line
Rankine Line
An inventor proposes to develop electrical power by withdrawing heat from the geyser fields of northern California and converting it all to work in power turbines. This scheme will not work because
the geyser fields have only a limited lifetime
the salinity of steam is too great
it violates the first law of thermodynamics
it violates the second law of thermodynamics
The isotropic efficiency of a turbine is given by
the ratio of actual to ideal energy extracted
the ratio of actual to ideal energy inputted
the ratio of ideal to actual energy extracted
none of the above
Which of the followong is not a main part of a tyoical coal burner?
Air registers
Nozzle
Atomizer
Ignitor
Measure of ability of a boiler to transfer the heat given by the furnace to the water and steam is
grate efficiency
stroke efficiency
furnace efficiency
boiler efficiency
A goose neck is installed in the line connecting a steam gauge to a boiler to
maintain constant steam flow
protect the gauge element
prevent steam knocking
maintain steam pressure
Which of the following is a great advantage of a fire tube boiler?
Steam pressure is not ready
contains a large volume of water and requires long interval of time to raise steam and not so flexible as to changes in steam demand
cannot use impure water
Radiation losses are higher because fire is inside the boiler and surrounded by water
One of the following tasks which is an example of preventive
cleaning the cup on a rotary cup burner
cleaning a completely clog oil strainer
replacing a leaking valve
replacing a blown fuse
