STEAM POWER PLANT

Which of the following factors does bursting pressure of Boiler doesn’t depend?

A. Tensile strength of the shell

B. Thickness of the shell

C. Diameter of the shell

D. Shear strength of shell material

Which of the following factors does working pressure of boiler doesn’t depend?

A. Tensile strength of shell

B. Thickness of shell

C. Factor of safety

D. Type of fuel being fired

Total solid impurities in feed water for a boiler depend upon.

A. Boiler pressure

B. Quantity of steam to be generated

C. Type of fuel available

D. Quantity of steam

A high pressure chamber or a device in which the paths of rapidly moving particles can be observed and photographed.

A. Combustion chamber

B. Fission chamber

C. Cloud chamber

D. Air chamber

The formation of gas bubbles in a liquid is called

A. Bubbling

B. Foaming

C. Priming

D. Carryover

How many check valves should be provided between any feed pump and boiler?

A. 1

B. 2

C. 3

D. 4

The water level inside the boiler is indicated by the

A. Baffles

B. Fusible plug

C. Water walls

D. Water column

What is the highest pressure under which distinguishable liquid and vapor phases can exist in equilibrium?

A. Maximum pressure

B. Atmosphere

C. Critical pressure

D. Peak pressure

What is the average fuel – oil temperature range of the oil in the discharge line to the boiler?

A. 180 – 200 ͦF

B. 240 – 260 ͦF

C. 160 – 180 ͦF

D. 140 – 160 ͦF

The lowest permissible water level of a boiler without internal furnace is _____the height of the shell.

A. 1/2

B. 1/3

C. 1/4

D. 1/5

In case of steam engine the cut off ratio is the ratio of:

A. Pressure at cut off to supply pressure

B. Pressure at cut off to exhaust pressure

C. Pressure at cut off to mean effective pressure

D. Fraction of piston stroke which the piston has traveled when cut off occurs

In a condensing steam engine

A. Condensed steam is supplied

B. Steam condenses inside cylinder

C. Steam condenses as soon as it leaves the cylinder

D. Exhaust steam is condensed in a condenser

Flows through the nozzles and diffusers with increasing fluid velocity will create an equivalent

A. Decrease in the static enthalpy of fluid

B. Increase in the static enthalpy of fluid

C. Decrease in the internal energy of fluid

D. Decrease in the dynamic enthalpy of fluid

The term V^2/2 Cp responds to the temperature rise during such a process and is called the

A. Kinetic temperature

B. High temperature

C. Dynamic temperature

D. Elevation temperature

All of the following mechanism can supply heat to a thermodynamic system except

A. Conduction

B. Natural convection

C. Adiabatic expansion

D. Radiation

The flow through the nozzle is

A. Isentropic

B. Polytropic

C. Isobaric

D. Isovolumic

If the reservoir is sufficiently large, the nozzle inlet velocity is

A. Maximum

B. Negative

C. Positive

D. Zero

Which of the following is the pressure applied at the nozzle discharge section?

A. Stagnant pressure

B. Critical pressure

C. Back pressure

D. 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:

A. Stacked

B. Choked

C. Stuck-up

D. Clog-up

An increase in stagnation pressure will increase the mass flux through the:

A. Diverging nozzle

B. Converging nozzle

C. Converging – diverging nozzle

D. None of these

A converging – diverging nozzle is the standard equipment in:

A. Subsonic aircraft

B. Supersonic aircraft

C. Hypersonic aircraft

D. Trisonic aircraft

For back pressure valves, abrupt changes in fluid properties occur in a very thin section of converging – diverging nozzle under supersonic flow conditions, creating

A. Sound wave

B. Tidal wave

C. Shock wave

D. None of these

Is the locus of states which have the same value of stagnation enthalpy and mass flux are called:

A. Fanno line

B. Straight line

C. Willan’s line

D. Cross cut line

Combination of mass and momentum equations into a single equation and plotted in h-s plane yield a curve called:

A. Fair line

B. Freh line

C. Cutting line

D. Rayleigh line

Generally steam turbines in power station operate at

A. 3000 rpm

B. 1000 rpm

C. 4000 rpm

D. 575 rpm

Which of the following shows the relationship of the steam consumption and the load of steam turbine generator?

A. Dalton’s line

B. Willan’s line

C. Jonval’s line

D. 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. The scheme will not work because:

A. The geyser fields have only a limited lifetime

B. The salinity of the steam is too great

C. It violates the first law of thermodynamics

D. It violates the second law of thermodynamics

The isentropic efficiency of a turbine is given by

A. The ratio of actual to ideal energy extracted

B. The ratio of actual to ideal energy inputted

C. The ratio of ideal to actual energy extracted

D. None of the above

Which of the following is not a main part of a typical coal burner?

A. Air registers

B. Nozzle

C. Atomizer

D. Ignitor

Measure of ability of a boiler to transfer the heat given by the furnace to the water and steam is:

A. Grate efficiency

B. Stroke efficiency

C. Furnace efficiency

D. Boiler efficiency

A goose neck is installed in the line connecting a steam gauge to a boiler to:

A. Maintain constant steam flow

B. Protect the gauge element

C. Prevent steam knocking

D. Maintain steam pressure

Which of the following is a great advantage of a fire tube boiler?

A. Steam pressure is not ready

B. Contains a large volume of water and requires a long interval of time to raise steam and not so flexible as to changes in steam demand

C. Cannot use impure water

D. 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 maintenance is

A. Cleaning the cup on a rotary cup burner

B. Cleaning a completely clog oil strainer

C. Replacing a leaking valve

D. Replacing a blown fuse

The carbon dioxide percentage in the flue gas of an efficiency fired boiler should be approximately

A. 1 %

B. 12 %

C. 18 %

D. 20 %

When droplets of water are carried by steam in the boiler

A. Priming

B. Foaming

C. Carryover

D. Embrittlement

The process in which heat energy is transferred to a thermal energy storage device is known as:

A. Adiabatic

B. Regeneration

C. Intercooling

D. Isentropic

When the boiler pressure increases or when the exhaust pressure decreases, the amount of moisture

A. Increases

B. Decreases

C. Constant

D. Zero

When the number of reheat stages in a reheat cycle is increased, the average temperature

A. Increases

B. Decreases

C. Is constant

D. Is zero

A heat transfer device that reduces a thermodynamic fluid from its vapor phase to its liquid phase such as in vapor compression refrigeration plant or in a condensing steam power plant

A. Flash vessel

B. Cooling tower

C. Condenser

D. Steam separator

A simultaneous generation of electricity and steam(or heat) in a single power plant

A. Gas turbine

B. Steam turbine

C. Waste heat recovery

D. Cogeneration

Is one whose pressure is higher than the saturation pressure corresponding to its temperature.

A. Compressed liquid

B. Saturated liquid

C. Saturated vapor

D. Superheated vapor

In a steam generator with good combustion control, what occurs if the load is increased?

A. Air temperature leaving air heater decreases

B. Air temperature entering air heater increases

C. Furnace pressure is approximately constant

D. Economizer gas outlet temperature decreases

Total solid impurities in feed water for a boiler depend upon

A. Boiler pressure

B. Type of fuel available

C. Quantity of steam to be generated

D. Quantity of steam

The gaseous state of water

A. Water gas

B. Blue gas

C. Water vapor

D. Yellow gas

A liquid boils when it vapor pressure equals

A. The gage pressure

B. The critical pressure

C. The ambient pressure

D. One standard atmosphere

What are the main components in a combined cycle power plant?

A. Diesel engine and air compressor

B. Gas engine and waste heat boiler

C. Steam boiler and turbine

D. Nuclear reactor and steam boiler

A change in the efficiency of combustion in a boiler can usually be determined by comparing the previously recorded readings with the current readings of the _________.

A. Stack temperature and CO

B. Over the fire draft and CO

C. Ringleman chart and CO2

D. Stack temperature and CO2

A boiler steam gauge should have a range of at least

A. One half the working steam pressure

B. 1 and ½ times the maximum allowable working pressure

C. The working steam pressure

D. Twice the maximum allowable working pressure

In a water tube boiler, heat and gases of combustion passed:

A. Through the combustion chamber only

B. Through the tubes

C. Away from tubes

D. Around the tubes

A chemical method of feedwater treatment which uses calcium hydroxide and sodium carbonate as Reagents

A. Thermal treatment

B. Lime soda treatment

C. Demineralization process

D. Ion exchange treatment

The thermal efficiency of gas-vapor cycle as compared to steam turbine or gas turbine is

A. Greater than

B. Less than

C. Lower than

D. Equal to

The thermal efficiency of gas-vapor cycle as compared to steam turbine or gas turbine is

A. Greater than

B. Less than

C. Lower than

D. Equal to

The most economical and low maintenance cost condenser.

A. Water – cooled

B. Air – cooled

C. Evaporative

D. Sub – cooled

What is commonly done to system when the turbine has excessive moisture?

A. Frosting

B. Diffusing

C. Reheating

D. Dehumidifying

What is the result when the fluid’s kinetic energy during a stagnation process is transformed to enthalpy?

A. Decrease in fluids volume

C. Rise in the temp. And pressure of the fluid

C. Rise in fluid’s volume

D. Decrease in the temp. And pressure of fluid

How can the average temperature during heat rejection process of a Rankine cycle be decreased?

A. Increase boiler pressure

B. Increase turbine pressure

C. Increase condenser pressure

D. Reduce turbine exit pressure

Which of the following ascertains the effectiveness and the size of a condenser?

A. Number of passes

B. Thickness of the shell

C. Tube sizes

D. Heat transfer

A boiler has a bursing pressure, BP of 600 kPa and a factor of safety, FS of 8 is employed in design. As an engineer, would you advice to have a working pressure, WP of 500 kPa?

A. No. WP must be higher than 500 kPa

B. No. WP is only 75 kPa at FS of 8

C. Yes. Since BP is 600 Pa

D. Yes. To attain better efficiency

What cycle is used in vapor cycle of steam power plant?

A. Brayton cycle

B. Diesel cycle

C. Ericsson cycle

D. Rankine cycle

Gauge cock in the boiler is designed to determine:

A. Level of steam

B. Specific heat

C. Level of water

D. Pressure

STEAM POWER PLANT

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