Unit5 Energy Plant Maintenance Flashcards
When replacing a firetube in a tubesheet, the tube end should extend beyond the tubesheet by: Select one: a. 5 mm b. 1 tube wall thickness c. The size of the tube roller mandrel d. 2 times the tube wall thickness
d. 2 times the tube wall thickness
“Laying up” a boiler means:
Select one:
a. Preparing the boiler for a period of storage
b. Setting the boiler on its foundation
c. Dismantling the boiler for annual overhaul
d. Preparing a boiler for start up
a. Preparing the boiler for a period of storage
Workers should not work any higher than \_\_\_\_\_ steps from the top of an extension ladder. Select one: a. Three b. Two c. One d. Four
a. Three
The knot that forms a loop that will not slip or jam is the: Select one: a. Square or reef knot b. Figure eight c. Sheet bend d. Bowline
d. Bowline
Machine bolts are commonly supplied with: Select one: a. Pan heads b. Oval heads c. Hexagon heads d. Square heads
c. Hexagon heads
The most accurate way to determine the mass of an object, prior to attempting to hoist it, is to
Select one:
a. Test lift it
b. Err on the side of caution
c. Use the manufacturer’s original specification sheets
d. ask an experienced rigger
c. Use the manufacturer’s original specification sheets
An inhibitor, when added to acid, will:
Select one:
a. Prevent or minimize the effect of the acid on the boiler metal
b. Make the acid compatible with the sewer system for disposal
c. Strengthen the acid, thereby shortening the duration of the cleaning procedure
d. Neutralize the acid residue remaining on the boiler metal after a chemical cleaning
a. Prevent or minimize the effect of the acid on the boiler metal
A screwdriver with a square tip is called \_\_\_\_\_\_\_\_\_\_\_\_\_\_ screwdriver. Select one: a. a slot b. an Allen c. a Robertson d. a Phillips
c. a Robertson
When shutting down a boiler for internal cleaning:
Select one:
a. Shut down the boiler, then fill it completely with chemically treated water
b. Shut off the fire. Then, drain the boiler while it is hot, open it up, and flush it
c. Allow the boiler to cool. Then drain it, open it up, and flush it
d. Let it stand for a couple of days, then drain it
c. Allow the boiler to cool. Then drain it, open it up, and flush it
To measure the small clearance between a valve tappet and a cam lobe, \_\_\_\_\_\_\_\_\_ is used. Select one: a. An inside micrometer b. A scale ruler c. A vernier caliper d. A feeler gauge
d. A feeler gauge
Which one of these government agencies or regulations covers the use and erection of work platforms?
Select one:
a. Boilers and Pressure Vessels Branch
b. Occupational Health and Safety Act and Regulation
c. Industrial Accident Prevention Association
d. Provincial elevator and hoisting device inspection branch
b. Occupational Health and Safety Act and Regulation
When using a step ladder, it is best to:
Select one:
a. Not work higher than the top three rungs
b. Tie off while standing on the top platform
c. Have two co-workers hold the ladder steady
d. Secure the ladder with a rope
a. Not work higher than the top three rungs
Safe rigging practice dictates that weight estimates of objects to be lifted, when the objects are relatively lightweight, should be accurate within plus or minus \_\_\_\_\_. Select one: a. 500 lbs b. 100 Kgs c. 20% d. 50%
c. 20%
The packing gland of a hot water boiler circulating pump should have some leakage:
Select one:
a. To prevent the packing from drying out.
b. So that the shaft sleeve will wear instead of the shaft.
c. To allow air to exit the pump, so the pump does not lose its prime.
d. So the operator can tell if the sealing water is turned on.
a. To prevent the packing from drying out.
The final step when replacing a firetube is: Select one: a. Re-expansion b. Hydrostatic test c. Seal welding d. Annealing the tube ends
b. Hydrostatic test
Channels or flutes are: Select one: a. types of wrenches b. parts of a die c. types of punches d. gaps in a tap for chips
d. gaps in a tap for chips
During a wet layup, a water tank should be installed above the boiler and attached to the boiler vent connection in order to:
Select one:
a. Permit the injection of boiler chemicals.
b. Prevent air from entering the boiler water.
c. Keep the nitrogen cap from venting to the atmosphere
d. Provide pure water for rinsing the exterior of the boiler.
b. Prevent air from entering the boiler water.
Which of the following valves is locked or tagged open when preparing a boiler for internal inspection?
Select one:
a. continuous blowdown
b. non-return drain
c. bottom blowoff
d. header isolation
b. non-return drain
The point of a properly ground drill bit should be: Select one: a. 35° b. 78° c. 118° d. 135°
c. 118°
A common way to determine the mass of an object to be hoisted is by determining its
Select one:
a. Density and volume
b. Size and shape
c. centre of gravity
d. Specific gravity and centripetal force
a. Density and volume
In order to check the trueness of a flat surface, one would use a: Select one: a. Hermaphrodite divider b. Surface plate c. Layout bench d. Machinist’s square
b. Surface plate
When a boiler is removed from service, it can be drained once the temperature reaches approximately: Select one: a. room temperature b. 50°C c. 90°C d. 70°C
c. 90°C
A tap with the marking M4 is a:
Select one:
a. High-strength alloy steel tap
b. Metric thread, 4 mm nominal diameter tap
c. Metric thread, 4 cm nominal diameter tap
d. Metric thread with a 4 tooth per mm pitch
b. Metric thread, 4 mm nominal diameter tap
The gaskets for the front and rear doors of a firetube boiler should be coated with:
Select one:
a. high temperature silicone sealant, to prevent flue gas leakage.
b. high temperature silicone sealant, to prevent excess air from leaking into the furnace.
c. contact cement, to keep the gasket from coming loose.
d. an anti-seize compound to prevent the gasket from sticking to the mating surfaces
d. an anti-seize compound to prevent the gasket from sticking to the mating surfaces
A substance that absorbs humidity inside a boiler during dry layup is: Select one: a. Zeolite b. Sodium sulphite c. Activated alumina d. Lime soda
c. Activated alumina
The top of a ladder should extend approximately \_\_\_\_\_ above the level of the upper landing to which it provides access. Select one: a. 3 rungs b. 0.5 m c. 1 m d. 1 rung
c. 1 m
Prior to a worker entering the steam drum of an off-line boiler that is connected to a common, pressurized steam header, the
Select one:
a. header must be shut down and depressurized
b. Boiler Inspector must be informed before any work occurs
c. main steam, blowdown and feedwater valves must be closed, locked and tagged
d. drum must be vented, the safety valve must be gagged, and all ash and soot removed from the firebox
c. main steam, blowdown and feedwater valves must be closed, locked and tagged
Chalk or \_\_\_\_\_\_\_\_ may be used to rub on the surface of rough castings as a marking material. Select one: a. wax b. layout ink c. soap stone d. blue vitriol
c. soap stone
Lock washers:
Select one:
a. Prevent marring of the work surface
b. Distribute the lock nut force
c. Reduce the chances of unwanted turning of the bolt or nut
d. Prevent the equipment from being dismantled
c. Reduce the chances of unwanted turning of the bolt or nut
Smaller boilers are not often cleaned chemically because:
Select one:
a. most small boilers are firetube designs, which are best cleaned mechanically.
b. small boilers have thin metal, and may be damaged by cleaning chemicals.
c. small boilers develop little waterside scale, because of their low steaming rates.
d. the expense of chemicals, complex piping, and pumping systems may not be justified for cleaning smaller boilers.
d. the expense of chemicals, complex piping, and pumping systems may not be justified for cleaning smaller boilers.
Soot should be removed from firetube boiler tubes with: Select one: a. a sandblaster b. high pressure steam lances c. wire brushes d. detergent
c. wire brushes
The recommended inspection procedures for a power boiler are outlined in the:
Select one:
a. CSA B51 Boiler, Pressure Vessel and Pressure Piping Code
b. ANSI B31.1 Power Piping Code
c. ASME Boiler and Pressure Vessel Code, Section I
d. ASME Boiler and Pressure Vessel Code, Section VII
d. ASME Boiler and Pressure Vessel Code, Section VII
The most commonly used acid for boiler cleaning is: Select one: a. Sulphuric b. Hydrochloric c. Nitric d. Sulphamic
b. Hydrochloric
For an alkaline boil out, a boiler is fired and maintained under steam pressure for about: Select one: a. 7 days b. 30 Days c. 48 hours d. 10 hours
c. 48 hours
Ladders that are used in the workplace should comply with:
Select one:
a. CSA Standards for Scaffolding
b. common industry practice
c. ASME/ANSI ladder material specifications
d. WCB regulations and CSA standards
d. WCB(Workers’ Compensation Board) regulations and CSA standards
Air removal prior to a hydrostatic test:
Select one:
a. Is critical, because the air will compress during the test
b. Will prevent oxygen corrosion.
c. Is done by adding oxygen scavenging chemicals to the test water.
d. Is done with a vacuum pump.
a. Is critical, because the air will compress during the test
One of the main purposes of an external boiler inspection is to:
Select one:
a. observe and assess boiler operation and maintenance practices.
b. inspect all auxiliary equipment and pressure vessels.
c. thoroughly assess the water treatment program.
d. thoroughly examine the boiler waterside.
a. observe and assess boiler operation and maintenance practices.
A strand of fibre rope
Select one:
a. Is wound around 19 others to form a full size rope
b. Will un-twist if subjected to a heavy load
c. Is the part melted to prevent unravelling
d. Is composed of yarns with a left-handed twist
d. Is composed of yarns with a left-handed twist
Black light crack detection utilizes ultraviolet light and: Select one: a. iridescent powder b. infrared dye c. magnetic radium powder d. fluorescent penetrant
d. fluorescent penetrant
A ball peen hammer is sometimes called a: Select one: a. Carpenter’s hammer b. Machinist’s hammer c. Mechanic’s hammer d. Millwright’s hammer
b. Machinist’s hammer
A scaffold should always be erected: Select one: a. when the available stepladder would require standing on the top step b. three feet above the work area c. by a safety contractor d. plumb and level
d. plumb and level
When storing a hacksaw:
Select one:
a. the blade should be removed
b. the saw should be stored in a protective sheath
c. release the tension on the blade
d. flip the blade, so that the cutting surfaces are not exposed to damage
c. release the tension on the blade
The external inspection of a boiler:
Select one:
a. may include ensuring the pressure relief valves are the correct setting and capacity
b. may include making sure the furnace refractory is in order
c. may include making sure the exterior of the tubes are in good condition
d. must be done after the boiler has been drained
a. may include ensuring the pressure relief valves are the correct setting and capacity
In order to prevent a rope from untwisting under load:
Select one:
a. It should be moistened
b. Iit should have thimbles installed on the ends
c. It has counteracting left-handed and right-handed twists
d. Each end requires “whipping”
c. It has counteracting left-handed and right-handed twists
A knot used to pull at right angles to a pipe or pole is the: Select one: a. Timber hitch b. Round turn and two half hitches c. Bowline d. Clove hitch
d. Clove hitch
With respect to tools, flutes are found on: Select one: a. The inside edges of thread dies b. The body of a twist drill bit c. The point of a twist drill bit d. The taper of a twist drill bit
b. The body of a twist drill bit
When two or more sling eyes are used when lifting an object, they should be:
Select one:
a. Of equal strength
b. slid through each other in choker fashion
c. Held in a shackle
d. Fastened with a wire rope clip
c. Held in a shackle
Which of the following valves is locked closed when preparing a boiler for internal inspection?
Select one:
a. bottom blowoff
b. drum vent
c. non-return drain
d. feedwater drain
a. bottom blowoff
`A rung ladder should: Select one: a. should be fully opened and locked b. be equipped with only metal feet c. be used in conjunction with a pole scaffold d. be inclined with a 4:1 slope
d. be inclined with a 4:1 slope
When filing cast iron:
Select one:
a. Start with the bastard cut file
b. use cutting oil to prevent heat and loss of hardness
c. Start with a smooth cut file
d. Add grinding compound to the filing surface
a. Start with the bastard cut file
What pressure is applied to a boiler during a hydrostatic test?
Select one:
a. 1.5 times the setting of the safety valve.
b. 1.5 times the maximum allowable working pressure.
c. Design pressure.
d. 2 times the setting of the lowest set safety valve.
b. 1.5 times the maximum allowable working pressure.
Copper sulphate may be used: Select one: a. As a thread cutting fluid b. For lubricating very fine threads such as those in a micrometer c. Coating tools to prevent rusting d. As a marking or layout material
d. As a marking or layout material
Castle nuts are used: Select one: a. To simplify assembly and disassembly b. To hold shims in place c. For locking square nuts in place d. With a split pin or cotter pin
d. With a split pin or cotter pin
A type of file which is always a single cut file is the: Select one: a. Half round file b. Mill file c. square file d. Pillar file
b. Mill file
Natural ropes are made of: Select one: a. Nylon b. Polyethylene c. Manila d. Stripped bamboo
c. Manila
Wire rope classified as 8 x 12 means it has:
Select one:
a. A factor of safety of 8 and is 12 strands
b. A factor of safety of 12 and is 8 wires per strand
c. 8 strands with 12 wires per strand
d. 8 strands containing 12 yarns each
c. 8 strands with 12 wires per strand
A tube beading tool is used:
Select one:
a. On water tube boilers
b. On fire tube boilers
c. To fasten the stays in the tube sheet
d. To unfasten fire tubes from the tube sheet.
b. On fire tube boilers
Chain hoists are designed: Select one: a. For horizontal use b. With the top hook as the strongest c. With a very low mechanical advantage d. For use when "choking" the load to be lifted
b. With the top hook as the strongest
One of the legal responsibilities of the engineer during an inspection is:
Select one:
a. To notify the Workers’ Compensation Board of the inspection
b. Point out any known or suspected defects to the inspector
c. To have at least two staff members present at all times
d. To be in possession of an inspection certificate
b. Point out any known or suspected defects to the inspector
During a maintenance shutdown, the furnace refractory in a boiler should be ___________ to prolong its life.
Select one:
a. Wash coated with a dilute solution of heat resistant cement
b. Coated with heat resistant epoxy paint
c. Dye penetrant tested
d. Roughened with a wire brush
a. Wash coated with a dilute solution of heat resistant cement
Steel mechanical fasteners that are commonly used in the automotive industry and on plant machinery are classed as: Select one: a. Carriage bolts b. Machine bolts c. Hexagon bolts d. Self tapping pan bolts
b. Machine bolts
Prior to a worker entering the steam drum of an off-line boiler that is connected to a common, pressurized steam header, the
Select one:
a. header must be shut down and depressurized
b. Boiler Inspector must be informed before any work occurs
c. main steam, blowdown and feedwater valves must be closed, locked and tagged
d. drum must be vented, the safety valve must be gagged, and all ash and soot removed from the firebox
c. main steam, blowdown and feedwater valves must be closed, locked and tagged
The purpose of annealing boiler tube ends is to: Select one: a. Post heat the tube ends b. Harden the tube ends c. Obtain a neat appearance d. Soften the tube ends
d. Soften the tube ends
Which of the following are chemicals used for boiler cleaning and treatment, that require careful control and vigilant monitoring? Select one: a. Chelants b. Phosphates c. Sulfites d. Sulfates
a. Chelants
What factor of safety should be used to determine the safe load for a new fibre rope?
Select one:
a. 100%
b. five
c. the safe load for fibre rope cannot be calculated
d. two
b. five
Hand taps are usually made in sets of three called: Select one: a. SAE, ISO, Metric b. Rough, coarse, and fine c. Taper, plug, and bottoming d. Primary, secondary, and finishing
c. Taper, plug, and bottoming
When two or more sling eyes are used when lifting an object, they should be:
Select one:
a. Of equal strength
b. slid through each other in choker fashion
c. Held in a shackle
d. Fastened with a wire rope clip
c. Held in a shackle
When filing cast iron:
Select one:
a. Start with the bastard cut file
b. use cutting oil to prevent heat and loss of hardness
c. Start with a smooth cut file
d. Add grinding compound to the filing surface
a. Start with the bastard cut file
Chain hoists are designed: Select one: a. For horizontal use b. With the top hook as the strongest c. With a very low mechanical advantage d. For use when "choking" the load to be lifted
b. With the top hook as the strongest
An eye that is made in a rope, using the proper number and spacing of wire rope clips, will be \_\_\_\_\_\_\_\_\_\_\_\_ as strong as the rope itself. Select one: a. 80% b. twice c. half d. equally
a. 80%
A type of file which is always a single cut file is the: Select one: a. Half round file b. Mill file c. square file d. Pillar file
b. Mill file
A single-pole scaffold:
Select one:
a. Is prohibited from use by Workplace Safety and Health
b. Is often referred to as the pogo platform
c. Is partially supported by a building
d. Need not be plumb, but must be level
c. Is partially supported by a building
A dressing tool is used to: Select one: a. Square the edges of a grinding wheel b. Clean the measuring contact surfaces of a micrometer c. Clean the grooves of a file d. Fit a new handle into a hammer head
a. Square the edges of a grinding wheel
A knot used to pull at right angles to a pipe or pole is the: Select one: a. Timber hitch b. Round turn and two half hitches c. Bowline d. Clove hitch
d. Clove hitch
When joining two ropes of different diameters we use a: Select one: a. braiding b. Sheet bend c. Figure eight knot d. Sheep shank
b. Sheet bend
It is recommended that a new boiler be shut down, drained, opened up, flushed out and inspected after the first \_\_\_\_\_\_\_ \_\_\_\_\_\_\_ of operation. Select one: a. Two weeks b. Three months c. Six days d. Three days
b. Three months
Castle nuts are used: Select one: a. To simplify assembly and disassembly b. To hold shims in place c. For locking square nuts in place d. With a split pin or cotter pin
d. With a split pin or cotter pin
The actual movable range of a metric micrometer is:
Select one:
a. one barrel rotation
b. adjustable using a jeweler’s screwdriver
c. bigger on larger micrometers
d. 25 mm
d. 25 mm
When working on a platform it is important to:
Select one:
a. Always wear a lifeline harness
b. Tie off to the scaffold
c. Warn people on the ground of overhead hazards
d. Notify the applicable government agency
c. Warn people on the ground of overhead hazards
When the fireside of a boiler is opened up, locations of water leakage may be detected by:
Select one:
a. Ultraviolet light
b. White dissolved solids left from water evaporation
c. Large rust nodules at the point of leakage
d. High pH boiler water running down the tubes
b. White dissolved solids left from water evaporation
