Power Engineering MCQ: June 2017

Archive for June 2017

Natural gases will require ___ excess air than solid fuels.

A. Less
B. More
C. 90%
D. 80%
E. None of the above

Answer: A

Which one is NOT the amount of excess air will depend on

A. Time available for the fuel to mix with the air
B. Time available for the 2CO to mix with the air
C. How well the fuel and air can be mixed together
D. The temperature exisitng within the furance

Answer: B

The complete combustion of 1 kg of coal is 15kg and the actual amount of air used in the furnace is 22kg for every kg of coal, what is the excess air?

A. 50%
B. 48%
C. 46%
D. 44%
E. 42%

Answer: C

The amount of excess air for proper combustion of fuel may vary from

The amount of excess air for proper combustion of fuel may vary from?

A. 5 to 30%
B. 15 to 60%
C. 10 to 50%
D. 10 to 60%
E. 5 to 50%

Answer: D

The balanced equation for the complete combustion of Sulphur is:

a. S + O2 = SO2+ heat
b. S + O3 = SO3 + heat
c. S + 2O = S2O + heat
d. 2S + O2 = 2S2O + heat
e. 2S2 + 2S2 = 2S2O + heat

Answer: A

Another name for hydrocarbons is?

A. Volatile matter
B. Strange matter
C. Photonic matter
D. Degenerate matter

Answer: A

Which elements are combustible?

A. Hydrogen, Carbon, Ash
B. Moisture, Carbon, Sulphur
C. Hydrogen, Carbon, Sulphur
D. Hydrogen, Ash, Sulphur

Answer: C

The refining process for fuel oils involves separating the crude oil into end products, which have distinguishing characteristics, such as specific gravity, viscosity, and:

a. Color
b. Odor
c. Flammability
d. Boiling point
e. Solids content

Answer: D

If there is insufficient combustion air to a boiler furnace, the result will be:

a. High CO2 readings in the flue gas
b. An increase in boiler efficiency
c. High CO in the flue gases
d. A reduction in draft fan power requirements
e. Higher than normal flue gas temperature

Answer: C

Which of the following substances is commonly found in fuel, but is non-combustible?

a. CO
b. H2
c. C
d. H2O
e. S

Answer: D

The balanced equation for the complete combustion of hydrogen is:

a. H2 + O = H2O + heat
b. 2H + O2 = H2O + heat
c. H2 + 2O2 = 2H2O + heat
d. 2H2 + O2 = 2H2O + heat
e. 2H2 + 2O2 = 2H2O + heat

Answer: D

The complete combustion of carbon is represented by the balanced equation C + O2 =:

a. CO
b. CO + heat
c. CO2 + heat
d. 2CO2
e. 2C + 2O

Answer: C

Which of these is NOT used for burning coal?

a. Under feed stoker
b. Rotary cup stoker
c. Cross feed stoker
d. Over feed stoker
e. Chain grate stoker

Answer: B

Carbon that is not combined with hydrogen is referred to as:

a. Mono-carbon
b. Loose carbon
c. Separated carbon
d. Free carbon
e. Fixed carbon

Answer: E

With respect to boiler combustion, an exhauster fan:

a. Is the same as an ID fan
b. Extracts ash from a hopper
c. Extracts solid particles from flue gases
d. Exhausts dust from the coal crushers
e. Extracts pulverized coal from a pulverizer

Answer: E

Which of the following is NOT necessary for complete combustion of a fuel?

a. Enough air must be supplied
b. The temperature of the furnace must be high enough
c. The combustion air must be preheated
d. Enough time must be allowed for the fuel to burn
e. The air and fuel must mix thoroughly

Answer: C

A mechanical atomizing burner has oil pumped under high pressure through a:

a. Rotary cup
b. Ring burner
c. Multi-spud burner
d. Sprayer plate
e. Heater

Answer: D

One advantage of oil over coal as a fuel is that oil:

a. Burns cleaner
b. Is more abundant
c. Is less expensive
d. Requires no storage space
e. Has more fixed carbon

Answer: A

The amount of air required to supply just enough oxygen for complete combustion is called the:

a. Minimum air
b. Perfect air
c. Primary air
d. Theoretical air
e. Secondary air

Answer: D

The purpose of the combustion controls on a boiler is to:

a. Maintain the proper ratio of combustion air to flue gas
b. Maintain a constant fuel flow
c. Vary the air and fuel ratio with variations in firing rate
d. Maintain the proper ratio of air to fuel
e. Maintain a negative pressure in the furnace

Answer: D

The amount of excess air required for combustion in a boiler furnace is determined by the:

a. Ambient temperature of the outside air
b. Air supply pressure
c. Size of the boiler
d. Load on the boiler
e. Composition and condition of the fuel

Answer: E

The balanced equation for the incomplete combustion of carbon is:

a. C + O2 = CO2 + heat
b. 2C + O2 = CO + heat
c. C + 2O2 = 2CO + heat
d. 2C + 2O2 = 4CO + heat
e. 2C + O2 = 2CO + heat

Answer: E

Before an oil burner is removed from a boiler furnace, the burner should be blown out with:

a. Solvent
b. Coal oil
c. High temperature solvent
d. Nitrogen or carbon dioxide
e. Steam or air

Answer: E

The stack temperature of a boiler can rise if:

a. Excess air is reduced
b. The waterside of the boiler becomes cleaner
c. The fireside of the boiler becomes dirty
d. The percentage of CO in the flue gas rises
e. The rate of fuel flow decreases

Answer: C

In North America, a major disadvantage of oil over coal is that oil:

a. Does not burn as clean
b. Is more difficult to control
c. Is more expensive and less abundant
d. Requires more storage space
e. Requires more labour to handle

Answer: C

When a gas-fired burner is operating properly:

a. The flame will be blue with short yellow tips
b. The furnace will pulsate
c. There will be no turbulence
d. It will have a long, bright, yellow flame
e. The induced draft fan can be shut off

Answer: A

The approximate amount of excess oxygen for combustion of a gaseous fuel is:

a. 10%
b. 7%
c. 5%
d. 15%
e. 2%

Answer: E

Combustion of fuel in a boiler furnace:

a. Requires a higher air-fuel ratio than a diesel engine
b. Requires a higher air-fuel ratio than a gas turbine
c. Should occur with a minimum of excess air
d. Is perfect when the stack gases are free of moisture
e. Requires mechanical draft

Answer: C

A boiler with only an induced draft fan:

a. Will have a negative furnace pressure
b. Is extremely inefficient
c. Needs a very tall stack
d. Will have a positive furnace pressure
e. Cannot maintain a stable fire

Answer: A

Boiler chimneys are commonly lined with:

a. Concrete
b. Rubber
c. Fire brick
d. Mortar
e. Insulation

Answer: C

A characteristic of mechanical draft is that the draft:

a. Varies with atmospheric pressure
b. Varies with chimney height
c. Varies with chimney temperature
d. Is properly regulated during all firing conditions
e. Varies with atmospheric temperature

Answer: D

Boiler combustion is regulated by:

a. Varying the speed of an ID fan
b. Controlling or regulating the fuel flow
c. Varying the speed of an FD fan
d. Controlling or regulating the air flow
e. Controlling the air and fuel flow

Answer: E

Natural draft is produced in a boiler furnace when:

a. Hot flue gases contract so that each cubic meter has more mass
b. Gases in the stack have less mass than an equal column of outside air
c. Gases in the stack have more mass than an equal column of outside air
d. Hot flue gases condense
e. The dampers are fully closed

Answer: A

Induced draft may be accomplished by a:

a. Steam jet
b. Barometric damper
c. Tall chimney
d. Wind box
e. Velocity stack

Answer: A

When an air heater is used in a boiler:

a. The forced draft fan supplies hot gases to the air heater
b. The induced draft fan supplies combustion air to the air heater
c. It increases the efficiency of the boiler
d. The boiler usually has only a forced draft fan
e. A balanced draft system cannot be used

Answer: C

The inclined tube manometer:

a. Uses pressure to tilt a common "U" tube manometer, making it more accurate and easier to read
b. Can only measure positive pressure
c. Can only measure a vacuum
d. Operates on the same principle as the "U" tube manometer
e. Operates by displacing a compressed gas

Answer: D

In a forced draft system, the furnace pressure is:

a. Above atmospheric pressure
b. Below atmospheric pressure
c. At atmospheric pressure
d. Measured in psi
e. Not measurable

Answer: A

An induced draft fan:

a. Is physically smaller than a forced draft fan
b. Has less expensive materials of construction than an FD fan
c. Operates at much higher temperatures than an FD fan
d. Discharges air to the wind box
e. Handles air only

Answer: C

A diaphragm type pressure gauge:

a. Is used to measure high pressures
b. Operates on a mercury column
c. Cannot be used for pressures greater than atmospheric
d. Is only found on large steam generators
e. Is used to measure very small pressures

Answer: E

When draft is produced by natural means:

a. Hot air surrounding the boiler increases draft
b. Fans control the flue gas flow
c. A short stack is preferred over a tall one
d. The diameter of the stack will improve the draft
e. Cooler air surrounding the boiler increases draft

Answer: E

With an axial flow fan, the air flow:

a. Is at right angles to the windbox
b. Is at right angles to the shaft
c. Does not come in contact with driving motor
d. Is the most efficient
e. Is parallel to the fan shaft

Answer: E

A more durable chimney for a power plant application is the _____ chimney.

a. Brick
b. Reinforced concrete
c. Steel
d. Insulated
e. Guy wire supported

Answer: B

In a balanced draft system, the air heater is located:

a. Between the economizer and the superheater
b. Between the forced draft fan and the superheater
c. Between ID fan and boiler
d. Between ID fan and stack
e. On inlet ducting to forced draft fan

Answer: C

Primary air:

a. Is supplied in the combustion zone
b. Is the same as excess air
c. Is supplied with all types of burners
d. Is premixed with fuel before being admitted to the furnace
e. Enters the furnace before the fuel

Answer: D

Inlet damper control on a fan:

a. Requires more power to drive the fan when the vanes are closed.
b. Requires less power to drive the fan at reduced loads.
c. Is only used when the fan is driven by a steam turbine.
d. Is only used on forced draft fans.
e. Is far less complicated than outlet damper control.

Answer: B

The most efficient operation of a fan demands that:

a. The speed be only high enough to supply the required amount of air
b. Inlet damper controls are used
c. Outlet damper controls are used
d. Constant speed electric motors are used
e. Gaseous fuels are fired

Answer: A

With fan output damper control:

a. The fan air pressure decreases with a decrease in air flow
b. The fan air pressure increases with a decrease in air flow
c. The damper is placed on the inlet side of the fan
d. Fan output is difficult to control
e. The furnace pressure remains constant

Answer: B

Which code specifies standards for the air openings required into a boiler room when the boiler is burning gas?

A. CSA B-52
B. ASME Section 1
C. CSA B-149.1
D. CSA B-139.1

Answer: C

Which code specifies standards for the air openings required into a boiler room when the boiler is burning oil?

A. CSA B-52
B. ASME Section 1
C. CSA B-149.1
D. CSA B-139.1

Answer: D

A diaphragm draft gauge indicates pressure in?

A. Kilopascals
B. Millimeters
C. Centimeters
D. Pascals

Answer: B

The inclined tube manometer advantages over the U tube manometer is?

A. Easier to read the scale
B. Gives an more accurate reading
C. Read higher readings
D. All of the above
E. A and B

Answer: E

In a balanced draft system, the control for the induced draft fan is?

A. Combustion control system
B. Furnace pressure
C. Variable speed Coupling
D. A and C

Answer: B

The combustion control system dictates the amount of steam being produced by sensing?

A. Steam pressure required
B. Fuel required
C. Air flow required
D. All of the above

Answer: D

Cost for this system is high, but gives excellent fan speed control , and requires the least amount of energy compared to any other type of control.

A. Fan speed control
B. Inlet damper control
C. Variable speed coupling
D. Air register

Answer: C

Using the inlet damper control

A. Reduces pollution
B. Less power required
C. More power required
D. None of the above

Answer: B

The damper for controlling the combustion air flow.

A. Fan speed control
B. Inlet damper control
C. Outlet Damper Control
D. Air register

Answer: B

The damper that restricts the fan output to any desired quantity.

A. Fan speed control
B. Inlet damper control
C. Outlet Damper Control
D. Air register

Answer: C

A steam turbine drives the fan and an automatic control system is used to regulate the steam flow to the turbine by means of a?

A. Fan speed control
B. Inlet damper control
C. Variable speed coupling
D. Air register

Answer: A

When draft is produced by natural means, the flow is controlled by?

A. Fan speed control
B. Inlet damper control
C. Variable speed coupling
D. Air register

Answer: D

What can happen to an induced draft fan when burning solid fuels?

A. Impeller may be subjected to corrosive action
B. Impeller may overheat
C. None of the above

Answer: A

Advantages of the induced draft fan over the forced draft fan?

A. Maintains the furnace pressure below atmospheric
B. Furnace inspection and burner openings do not require pressure sealing
C. Creates a positive pressure
D. All of the above
E. A and B

Answer: E

Advantages of the forced draft fan over the induced draft fan?

A. Longer fan life
B. Smaller size fan
C. Less power required
D. All of the above

Answer: D

What is an advantage of Mechanical Draft over Natural Draft?

A. Less equipment
B. Independent of chimney temperatures
C. No electricity required
D. Draft can be regulated more accurately
E. B and D

Answer: E

Why isn't a forced draft fan used when burning solid fuels?

A. Creates a positive pressure
B. More expensive
C. Higher maintenance requirements
D. All of the above
E. B and C

Answer: A

Why isn't a induced draft fan used when burning natural gas or liquids?

A. More expensive
B. Higher maintenance requirements
C. Hard to clean
D. All of the above
E. A and B

Answer: E

When burning natural gas or liquid fuels only what system is used?

A. Induced draft system
B. Forced draft system
C. Balanced draft system
D. None of the above

Answer: B

If efficiency is not important in burning solid fuels, what system is used?

A. Induced draft system
B. Forced draft system
C. Balanced draft system
D. None of the above

Answer: A

To increase efficiency of burning solid fuels which system is used?

A. Induced draft system
B. Forced draft system
C. Balanced draft system
D. None of the above

Answer: C

When burning solid fuels a ___ is normally used.

A. Induced draft system
B. Forced draft system
C. Balanced draft system
D. A and B

Answer: A

When burning solid fuels a ___ furnace pressure is required to keep hot gases from being expelled through openings.

A. Negative
B. Positive
C. Equal
D. None of the above

Answer: A

Balanced draft system is mostly used for?

A. Smaller sized boilers
B. Medium sized boilers
C. Large sized boilers
D. All of the above

Answer: C

In a balanced draft system the induced draft fan removes the flue gases, keeping the furnace pressure slightly ___ atmospheric.

A. Above
B. Below
C. None of the above

Answer: B

A system that that forces air into the furnace where combustion gases are removed by natural or mechanical means

A. Induced draft system
B. Forced draft system
C. Balanced draft system
D. All of the above

Answer: C

Axial Flow Fan is used on?

A. Smaller sized boilers
B. Medium sized boilers
C. Large sized boilers
D. All of the above

Answer: A

Which one is NOT a function of louvers?

A. Gives air a swirling motion in order to obtain better mixing of fuel and air
B. Shuts off the air supply when the burner has been taken out of service
C. Prevents other burners from being starved for air
D. When the boiler is taken offline all louvers are open

Answer: D

Another name for Louvers?

A. Windbox
B. Dampers
C. Forced air fan
D. None of the above

Answer: B

The lower duct passes underneath the boiler floor and is connected at the front to a ____ which distributes the air to a number of burners.

A. Windbox
B. Louver
C. Air heater
D. None of the above

Answer: A

The forced draft fan is connected to the lower duct which conveys the air through an ____ to preheat the air before it is admitted to the burners.

A. Windbox
B. Louver
C. Air heater
D. None of the above

Answer: C

The forced draft system casing is under ____ pressure.

A. Negative pressure
B. Positive pressure
C. Equal pressure
D. None of the above

Answer: B

Forced draft fan quantity of air admitted is usually regulated by?

A. Ductwork
B. Steam jet
C. Damper
D. Fans

Answer: C

Forced draft fan delivers air to the furnace by means of?

A. Ductwork
B. Steam jet
C. Damper
D. Fans

Answer: A

Forces air into the furnace

A. Induced draft fan
B. Steam jet
C. Forced draft fan
D. Fan

Answer: C

An induced draft fan may be driven by what?

A. Steam turbine
B. Motor
C. Centrifugal motion
D. All of the above
E. A and B

Answer: E

An induced draft fan is located where?

A. Near the furnace inlet
B. Near the furnace outlet
C. Near the superheater
D. None of the above
E. A and C

Answer: B

Gases from the boiler are drawn into the inner core of the impeller from both sides. They are accelerated by a rotating wheel and are discharged into a casing at high velocity. What device is this?

A. Double suction induced draft fan
B. Steam jet
C. Steam driven locomotives
D. Centrifugal fan

Answer: A

A partial vacuum in the furnace is created by?

A. Fan
B. Steam jet
C. Double suction induced draft fan
D. Venturi tube

Answer: B

Velocity of gases in the chimney is increased by a partial vacuum in the furnace which increases air flow into the furnace. This is done by?

A. Steam jet
B. Decreasing the temperature of gases in the furnace
C. Fan
D. All of the above
E. A and C

Answer: E

Which one is NOT part of Mechanical Draft Equipment?

A. Induced Draft Fan
B. Chimney
C. Forced Draft Fan
D. Balanced Draft System

Answer: B

What is done to reduce cost and weight of the steel chimney?

A. Lining may extend to only one third of the total length
B. Lining may extend to only two thirds of the total length
C. Remove some of the steel
D. None of the above

Answer: A

What are the disadvantages of the steel chimney?

A. Requires lots of maintenance
B. Requires lots of refractory lining
C. High cost to build
D. All of the above
E. A and B

Answer: E

What are the advantages of the steel chimney?

A. First low cost
B. Light construction
C. Constructed on the same structure that carries the weight of the boiler.
D. All of the above
E. A and C

Answer: D

Which chimney is the most popular one?

A. Reinforced concrete chimney
B. Brick chimney
C. Steel chimney
D. Copper chimney

Answer: C

Which material is not heat resistant and the chimney needs a clay lining if this material is used?

A. Reinforced concrete
B. Brick
C. Steel
D. None of the above

Answer: B

Which material is more durable for a chimney?

A. Reinforced concrete
B. Brick
C. Steel
D. None of the above

Answer: A

Chimneys are commonly constructed of?

A. Reinforced concrete
B. Brick
C. Steel
D. All of the above
E. A and C

Answer: D

Dust collectors may remove as much as __ of the dust from the flue gases emitted from the furnace.

A. 99%
B. 94%
C. 98%
D. 95%

Answer: C

For coal and other solid fuel-fired furnaces, and are installed in the flue gas ductwork before the flue gas enters the stack.

A. fans, steam jet
B. air heater, windbox
C. dust collectors, precipitators
D. None of the above

Answer: C

A taller stack will

A. Increase natural draft
B. Disperse dust and smoke
C. Increase resistance to air flow
D. All of the above

Answer: D

Increasing the stack temperature has a draw back which is?

A. More pollution
B. More heat
C. Heat loss
D. Frictional resistance

Answer: D

Which season is the best for draft conditions?

A. Winter
B. Summer
C. Spring
D. Fall

Answer: A

Which method is NOT a way to increase the pressure differential between the pressure at the furnace inlet and the pressure at the furnace exit?

A. Chill the outside air
B. Increase the temperature of gases leaving the furnace
C. Decrease the height of the chimney
D. None of the above

Answer: C

The pressure due to the column of colder air entering the furnace will be _____ the pressure due to the mass of the column of the lighter, heated gases at the base of the chimney.

A. Less than
B. Equal to
C. Greater than
D. None of the above

Answer: C

Hot gases in the stack, or chimney, will have ___ mass than a column of equal height of the outside colder air.

A. More
B. Less
C. Equal the
D. None of the above

Answer: B

When gas is heated, it tends to expand so that each has _ than it did before heating.

A. Cubic meter, less mass
B. Cubic meter. more mass
C. Cubic centimeter, less mass
D. Cubic centimeter, more mass

Answer: A

Air Admitted above the bed is called?

A. Undergrate Air
B. Underfire Air
C. Overfire Air
D. Tertiary Air

Answer: C

With solid fuel fired systems, where the fuel is burned in a bed on grates, air that is introduced under the grates may be called?

A. Undergraduate Air
B. Underfire Air
C. A and B
D. Tertiary Air

Answer: C

An additional layer of air is introduced at the end of the combustion zone to ensure that the fuel is burned completely. This is referred to as?

A. Undergraduate Air
B. Underfire Air
C. Overfire Air
D. Tertiary Air

Answer: D

Secondary air is given ___ rotation.

A. Clockwise
B. Counter Clockwise
C. A and B
D. None of the above

Answer: C

Primary air is given ___ rotation.

A. Clockwise
B. Counter Clockwise
C. A and B
D. None of the above

Answer: A

The remaining air necessary for complete combustion.

A. Draft
B. Primary Air
C. Secondary Air
D. Overfire Air

Answer: C

Refers to the air which may be premixed with the fuel before being admitted to the furnace.

A. Draft
B. Primary Air
C. Secondary Air
D. Overfire Air

Answer: B

The part of a tree most adversely affected by acid rain is the:

a. Leaves
b. Branches
c. Roots
d. Reproductive system
e. Bark

Answer: C

Hydrogen is considered ideal as an alternative fuel because:

a. It burns at low temperatures, minimizing NOx formation
b. It has nearly the same heating value as carbon
c. It is safe and easy to store
d. Water vapour is the only product of combustion
e. The cost of production is minimal

Answer: D

Ozone is particularly hazardous in:

a. The stratosphere
b. The upper atmosphere
c. All levels of the atmosphere
d. All concentrations
e. The lower atmosphere

Answer: E

The greenhouse effect is responsible for:

a. Heart and circulatory system strain
b. The diminishing maple sugar industry
c. Drought conditions
d. Fouling of fish gills
e. The death of microscopic life in lakes

Answer: C

Nitrogen oxides are referred to collectively as:

a. Laughing gases
b. NO2
c. N2O
d. NOX
e. N2O5

Answer: D

The gaseous pollutant that contributes to acid rain is:

a. Ozone
b. Carbon dioxide
c. Carbon monoxide
d. Mercaptan
e. Sulphur dioxide

Answer: E

Incomplete combustion of fuel is responsible for the production of:

a. Acid Rain
b. Carbon dioxide
c. Hydrogen sulphide
d. Sulphur dioxide
e. Carbon monoxide

Answer: E

The dual register burner reduces nitrogen oxides in the flue gas by:

a. Reducing turbulence and combustion temperatures.
b. Using maximum excess air for high combustion temperatures.
c. Completing combustion in the burner tube, before the furnace.
d. Increasing turbulence for most efficient combustion.
e. Supplying cooling air to reduce furnace temperature

Answer: A

Regenerable systems used for flue gas desulphurization:

a. Are less expensive than non-regenerable methods
b. Use lime or limestone when scrubbing the flue gas
c. Produce a marketable by-product
d. Are more widely applied than non-regenerable systems
e. Scrub flue gas with sulfuric acid

Answer: C

Acid rain forms when

a. The temperature is cool and the humidity is high
b. The temperature and humidity are high
c. Warm fronts meet cold fronts
d. There are severe electrical storms
e. Water vapour and sunlight act on atmospheric SOx and NOx

Answer: E

Methane gas is often produced by:

a. Insufficient combustion air
b. Decomposition of organic matter
c. The burning of plastics
d. High intensity sunlight acting on ozone
e. Discharging Halon fire extinguishers

Answer: B

The most common method of removing sulphur dioxide from flue gases uses:

a. Caustic soda
b. Limestone
c. Filtration
d. Sodium carbonate
e. A dilute sulphuric acid wash

Answer: B

A gaseous pollutant that contributes to ozone depletion is:

a. Nitrous oxide
b. Sulphur oxide
c. Carbon dioxide
d. Carbon monoxide
e. Methane

Answer: A

Carbon dioxide is responsible for _____ % greenhouse gasses:

a. 20
b. 30
c. 40
d. 50
e. 60

Answer: D

Greenhouse gases allow the passage of ____ energy radiation.

A. High
B. Low
C. Potential
D. Heat

Answer: A

The conversion of Nitrogen oxides occurs at temperatures above

A. 1000C
B. 1225C
C. 1450C
D. 1650C

Answer: D

Chlorofluorocarbons

A. Contribute to the acid rain problem
B. Are the main heat trapping gases responsible for the greenhouse effect
C. Destroy ozone after they reach the stratosphere
D. Combine with ozone to produce toxins

Answer: C

In order for acid rain to be formed

A. Atmospheric temperatures must be correct
B. Water vapour must be present
C. Sunlight must be present
D. Water vapour and sunlight must be present

Answer: D

A gaseous pollutant that contributes to acid rain is?

A. Carbon Dioxide
B. Ozone
C. CFCs
D. Sulphur Dioxide

Answer: D

The upper level gas that shields the earth from ultraviolet radiation is?

A. Oxygen
B. Ozone
C. Carbon Dioxide
D. Nitrogen

Answer: B

A kilogram of hydrogen delivers about ___ times more energy than a kilogram of carbon.

A. 4.28
B. 4.25
C. 4.26
D. 4.23
E. 4.27

Answer: B

A system that reduces the formation of NOx by limiting turbulence, thus reducing the peak flame temperature at the burner.

A. Dual Register Burner
B. Low Excess Air Operation
C. Two Stage Combustion
D. Gas Recirculation

Answer: A

A system that reduces the formation of NOx by recirculation of combustion gases which provides dilution of combustion air.

A. Dual Register Burner
B. Low Excess Air Operation
C. Two Stage Combustion
D. Gas Recirculation

Answer: D

A system that reduces the formation of NOx by taking away O2.

A. Dual Register Burner
B. Low Excess Air Operation
C. Two Stage Combustion
D. Gas Recirculation

Answer: B

A system that reduces the formation of NOx by taking the remaining air for combustion way from the initial combustion zone.

A. Dual Register Burner
B. Low Excess Air Operation
C. Two Stage Combustion
D. Gas Recirculation

Answer: C

NOx proceeds rapidly at the combustion zone temperatures in excess of?

A. 1630C
B. 1620C
C. 1650C
D. 1640C
E. 1620C

Answer: C

Which one is NOT how NOx is produced?

A. Percent of Sulphur in the fuel
B. Reactivity of nitrogen compounds contained in the fuel
C. Oxygen availability in the combustion zone
D. None of the above

Answer: A

Regenerable Wet Scrubbing Systems use ___ to remove SO2?

A. Nitrogen Oxides
B. Scrubber
C. Sulphur Oxides
D. Magnesium Oxides
E. None of the above

Answer: D

An advantage and disadvantage respectively of the Regenerable Wet Scrubbing System is?

A. Low cost but high maintenance required
B. Low maintenance but high cost
C. Marketable by-product produced but High cost
D. Marketable by-product produced but high maintenance required
E. Not much space required but high cost

Answer: C

The Limestone wet scrubbing system efficiency is to with combustion gases up to 5000 ppm SO2

A. 90 to 95%
B. 80 to 85%
C. 70 to 75%
D. 60 to 65%
E. 50 to 55%

Answer: A

FGD stands for?

A. Flue guided desulphurization
B. Flue gas desulphurization
C. Float guided desulphurization
D. Flue gas deoxidizer
E. None of the above

Answer: B

With an increase in greenhouse gases, the increasing average temperatures can cause?

A. Drought conditions
B. Polar ice masses to be reduced
C. Less oxygen
D. All of the above
E. A and B

Answer: E

A gas that is responsible for about 5% of greenhouse gases.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Caron Dioxide

Answer: C

A gas that is responsible for about 10% of greenhouse gases.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Caron Dioxide

Answer: D

A gas that is responsible for about 15% of greenhouse gases.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Caron Dioxide

Answer: B

A gas that is responsible for about 20% of greenhouse gases.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Caron Dioxide

Answer: A

The principal greenhouse gas, accounting for about 50% of the total problem.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Caron Dioxide

Answer: E

A gas that is not a greenhouse gas by itself, but it amplifies the effect of other gases.

A. Methane
B. Chlorofluorocarbons
C. Ozone
D. Nitrous Oxide
E. Water Vapour

Answer: E

Acid rain is formed with what gases?

A. CO2 and CFC
B. CO and CH4
C. NOx and SO2
D. O3 and SO2
E. CO and CO2

Answer: C

Form of oxygen that contains three oxygen atoms

A. Carbon Monoxide
B. Ozone
C. Methane
D. Carbon Dioxide
E. Chlorofluorocarbons

Answer: B

Compounds composed of chlorine, Florine, and carbon

A. Carbon Monoxide
B. Ozone
C. Methane
D. Carbon Dioxide
E. Chlorofluorocarbons

Answer: E

Main component of natural gas, a product of decomposed organic matter such as in swamps and sewage lagoons.

A. Carbon Monoxide
B. Ozone
C. Methane
D. Carbon Dioxide
E. Chlorofluorocarbons

Answer: C

An extremely poisonous gas produced by any combustion process that does not have enough air.

A. Carbon Monoxide
B. Ozone
C. Methane
D. Carbon Dioxide
E. Chlorofluorocarbons

Answer: A

A gas that is produced when fossil fuel is burned and is the most important gases on our planet

A. Carbon Monoxide
B. Ozone
C. Methane
D. Carbon Dioxide
E. Chlorofluorocarbons

Answer: D

Nitric acid (HNO3) account for __ of acid rain.

A. 50%
B. 30%
C. 70%
D. 40%
E. 60%

Answer: B

When water is added to NO2 what is produced?

A. Nitric acid (HNO3)
B. Nitrogen pentoxide (N2O5)
C. Nitrogen trioxide (N2O3)
D. Nitrogen oxide (N2O)
E. None of the above

Answer: A

More than __ of the NOx formed in the combustion zone is NO.

A. 40%
B. 80%
C. 50%
D. 90%
E. 60%

Answer: D

NO favoured temperatures above

A. 9000K
B. 3000K
C. 5000K
D. 4000K
E. 1000K

Answer: E

NO2 favoured temperatures below

A. 9000K
B. 3000K
C. 5000K
D. 4000K
E. 1000K

Answer: E

NO and NO2 are the major NOX gases formed by?

A. Ozone
B. Methane
C. CFCs
D. Combustion
E. None of the above

Answer: D

Sulphur Oxides are contained in?

A. Coals
B. Fuel oils
C. Hot springs
D. All of the above

Answer: D

Ozone problem produced is?

A. A very poisonous gas
B. A greenhouse gas
C. Destroys ozone after rising to the stratosphere
D. Hazardous to health and corrosive to many materials in the lower atmosphere.
E. The main heat trapping gas responsible for the greenhouse effect

Answer: D

Chlorofluorocarbons problem produced is?

Methane problem produced is?

Carbon Monoxide problem produced is?

Carbon Dioxide problem produced is?

Nitrogen Oxides are responsible for ___ of acid rain, produce smog and trap heat increase greenhouse effect?

A. 30%
B. 60%
C. 40%
D. 50%
E. 70%

Answer: A

Sulphur Oxides are responsible for ___ of acid rain?

A. 90%
B. 80%
C. 70%
D. 60%
E. 50%

Answer: C

When flame cutting, metal temperature must be brought above:

a. 1,000 C
b. 900 C
c. 980 C
d. 1,100 C
e. 870 C

Answer: E

A gas pocket or weld cavity caused by gas or moisture trapped in a weld is called:

a. a box
b. a blowhole
c. coalescence
d. a crater
e. spatter

Answer: B

When a weld is made with two pieces of parent metal at or near the same plane the weld is termed a:

a. fusion weld
b. butt joint weld
c. lap joint weld
d. bevel angle weld
e. box weld

Answer: B

When a weld pass is made to deposit a backing weld behind the root pass, it is termed:

a. a backing pass
b. the axis of the weld
c. boxing
d. the lead angle
e. the plug weld

Answer: A

Coalescence is:

a. the same as fusion
b. a type of coating used on a welding rod
c. a term used in brazing
d. a term used in soldering
e. the mixing of gases in a cutting torch

Answer: A

When flame cutting, a blast of pure oxygen is directed into the heated metal to:

a. blow molten metal out
b. brun away a portion of the metal
c. cool the metal
d. produce slag
e. remove slag

Answer: B

When brought into an oxygen rich atmosphere, steel will burn at:

a. 358 C
b. 507 C
c. 670 C
d. 870 C
e. 1,213 C

Answer: D

When a filler rod and very hot flame are used in a welding process, the weld method is:

a. submerged arc welding
b. heli-arc method
c. electric-arc method
d. oxy-acetylene method
e. spot-weld method

Answer: D

What is the colour of the oxygen hose on a oxy-acetylene welding set

a. red
b. green
c. black
d. white
e. yellow

Answer: B

When heat from electric current and pressure are used in welding it is known as:

a. spot welding
b. forge welding
c. submerged arc welding
d. MIG welding
e. TIG welding

Answer: A

Slag inclusions results from:

a. metal particles being sprayed out during the weld process
b. adding pieces of rod or metal as filler to the weld
c. solid non-metallic material being trapped in the weld
d. creation of a gas pocket due to trapped gases
e. stresses built up after the weld process

Answer: C

When acetylene is stored in a cylinder it is absorbed in:

a. water
b. acetone
c. chromate
d. phosphate
e. acetate

Answer: B

The oldest form of welding is:

a. resistance welding
b. spot welding
c. electric arc welding
d. plasma arc welding
e. forge welding

Answer: E