Deck 1 Flashcards
What is the recommended time for a complete external inspection of a boiler?
Once per shift
During a 24-hour operation how often should you check the water level?
Once per shift
The vertical distance from the center line of the pump to top level of the supply tank is called?
Static suction head
____ is the difference in pressure between two points of measurement
Draft
What do you do to attain complete combustion in a boiler?
Increase secondary air
What do you call the chemicals that are used to test water treatment for hardness?
Reagents
Combustion efficiency can be increased when air is _____
Preheated
Air leaking into the inner and outer of the boiler, what will happen?
Decrease boiler efficiency
The _____ is where the liquid refrigerant turns to gas and absorbs latent heat?
Evaporator
Sensible heat is ______
Heat that can be measured with a thermometer
What chemical compounds in water cause permanent hardness?
Calcium Sulfate and Magnesium Silicate
Which chemicals are used to combat scale?
Combined Phosphate Treatment
Boiler waterwalls should be blown down ____?
When the firebox is cool but the boiler still has pressure
Area = ?
Length x Width
High pressure boilers equipped with quick opening and screw type valves are blown down how?
By opening the quick opening valve first, and closing it last
On/off controls that activate devices using a one variable (i.e. pressure) are called?
Discrete controls
Voltage = ?
Current x Resistance
With hydroxide present and normal oxygen levels, which chemical will cause problems?
Chlorine
The chief heat producing elements in fuel contents are?
Carbon & Hydrogen
What are the 4 steps for a zeolite rejuvenations process?
Backwash, brine, rinse, service
The color for an R-134A refrigerant cylinder is _____?
Light blue
What controls the steam pressure and monitors the combustion air intake?
Fuel, air, water
What is the acceptable range for residual sodium sulfite in the boiler?
30-70
A steam pressure gauge must have a range of at least _____ ?
1-1/2 time the working pressure of the boiler
How many BTU does it take to raise 10 lbs of steam from 40° to 41°
1 BTU
How many things do safety controls protect against?
A. Overpressure
B. Overheating
C. Fireside explosions
The oil in a refrigeration system is used for _____
Cooling and lubrication
In the design of a water tube boiler the ____
Gases of combustion pass over the tubes and the water circulates through the tubes
What is the movement of an object by a constant force to a specific distance?
Work
Energy is _____?
The ability to do work
What is the BTU content of a gallon of #4?
146,000
In a HVAC system, controlled by thermostat, the difference is difference between?
Setpoint and the temperature at which the switch turns the system off
The component in which liquid vapor is absorbing heat is called?
Evaporator
Why is platinum used in RTD (resistive temperature device)?
Because of its high stability at high temperature
What must be submitted to the code official when field assembly of boilers is required?
Boiler inspection report
When conducting and evaporation test, the operator must secure what?
The feed water to the boiler
Which condition is a boiler not protected against?
Under pressure
With normal oxygen and low alkalinity, what is added to the boiler water?
Neutralizing Amines
Force = ?
Pressure/Area
What is hard forming scale?
Silica
Define Firetube Boiler
A boiler in which heat and gases of combustion pass through tubes surrounded by water
Every discharge pipe on a safety valve should be at least?
6 feet high
What would you add to a boiler, if you are needed to protect the refractory from excess heat and to increase the capacity of the boiler?
Riser tubes
What is the normal sodium sulfite level in a boiler?
20-40
Plume discharges from the cooling tower shall not less than?
5 feet
Before using soot blowers on a boiler ____
Drain the sootblower lines
Which valves to the boiler is opened ____ and _____ during blow down?
By opening the quick opening valve FIRST and closing it LAST
Data printed on the equipment nameplate would include manufacturer, model & serial number and _____
Stamp of approval from commissioning authority 1 BTU
If the firing rate increases on a boiler equipped with a convection type superheater, the super temperature will _____.
Increase
Select the best electrical grounding method?
Metal stake driven 8 ft into the ground
When should the flow control be blown down?
Once per shift
The part of the refrigeration system that absorbs heat into the system is controlled by the ____?
Evaporator
Boilers should be warmed up slowly when starting to _____ ?
Allow uniform expansion of drums and tubes
Downcomers are found _____?
In a watertube boiler
You have boiler water that is found to have a pH of 5. What compound do have add to neutralize?
Bases
A steam pressure gauge is protected against excessive temperature by _____?
Siphon
What steam trap has one movable device that rises to allow steam through and resets on condensate?
Float trap
A valve that requires five 360° turns of the hand wheel to change from fully opened to fully closed is ______?
Slow-Opening
What is the economizer on a boiler used for?
It is used to add heat to feedwater
Where is the cooling tower bleed line?
Drain line
Work = ??
Force/Distance
What type of valve would you use to control blow down?
Slow opening
Controls which use a quantity measured over a range of dynamic values are?
Analog
A proximate analysis of coal will not report what?
Percentage of various chemical elements
Discrete control when used to steam pressure is what type of control?
on/off, stop/go
An accumulation test is used to determine _____ ?
Safety valve capacity
_____ is carrying over of particles of water with the steam.
Priming
Celsius = ?
Fahrenheit - 32/1.8
Define watertube boiler
A boiler in which water passes through tubes surrounded by gases of combustion.
Fahrenheit = ??
(1.8 x Celsius) + 32
A stoker that uses a feed RAM is a ?
Underfeed stoker
An air handler unit that supplies a constant supply air temperature of 55° to building spaces and includes a coil is called a _______ air handler unit
Terminal reheat
Resistance = ?
Voltage/Current
Pressure = ?
Force/Area
An air handler unit that provides heating, cooling, ventilation, and air conditioning to more than one building or area and has its cooling & heating coil in separate side-by-side ducts is called a _____ air handler unit?
Multizone
Bituminous coal has a _____ content?
High Volatile
Which element does not take an actual action in the combustion process?
Nitrogen
What stays are used to support the burner chamber in a scotch marine boiler?
Diagonal Stays
How are fire tubes in a boiler secured?
To the tube sheet
What kind of steam trap has a simple float/disc that lifts?
Inverted bucket
Which is the cause of high excess in a condensate return tank with temperature up to 20° above normal?
Steam traps are stuck open
A condensate tank has a lot of steam existing from its vent it is registering 20° F higher than normal. What could be the reason?
Steam trap failing open
What is pump slip?
The difference between the pumps theoretical and actual pump displacement.
Where do you get the sub-cooling reading?
A. Get the liquid line PSI and convert to temp
B. Get the liquid line temp
C. (Liquid line PSI temp) - (Liquid line temp) = Sub Cool
On boilers that have both quick opening and screw type blow down valves, the quick opening must be located?
Closest to the boiler and followed by the screw type valves
In an open type expansion tank how high should the tank be mounted?
At least 4 feet above the highest heating element
The color for an R-410a refrigerant cylinder is _____?
Rose
Who can make adjustments or repairs on a safety valve?
Qualified person from manufacturer or representative
A chief engineer preparing for mud drum inspection, which of the following will you not do?
Set up a 110 volt lighting for inspection
What is the replacement refrigerant for R-22?
R-410a
What is the area of a circle?
0.7854
What is the pressure in PSI at the base of a column of water 250’ high and 8’ wide?
108
1’ water = 0.433 PSI
therefore
0.433 x 250 = 108
Boilers shall be designed and constructed in accordance with?
ASME CSD-1
Pyrometers can measure?
Temperature
What is the heart of the refrigeration system?
Compressor
What is the primary purpose of a crank case heater on a reciprocating chiller?
To prevent refrigeration migration
What jumper is used to connect the neutral and ground?
Main bonding jumper
What mechanical device is used to remove scale from fire tubes?
A tube rattler or vibrator is used
Where is the high temperature liquid found?
At the discharge of the compressor or condenser
Which compound does not produce heat?
Nitrogen
Sewer lines are protected from the _____ when blowing down a boiler
Blowdown tank
At 0 PSI, _____ BTU are necessary to change 1 lb of water at 212 F° into steam?
970.3
In a multi-zone air handler unit, the zone thermostat controls the zones temperature by?
Dampers that control the air flow from the hot & cold deck.
In a dual duct air handling system, space thermostatic control building temperature by?
Moving the air from the hot & cold duct in a molding box serving the space
In a multi-zone air handling unit, the zone thermostat controls the zone temperature by?
Dampers that control the air flow from the hot & cold deck
In a duct air handling system, space thermostat controls the building temperature by?
Mixing the air from the hot & cold duct in a mixing box serving the space
When taking a boiler offline, a vacuum is prevented by _____?
Opening the air cock
Latent Heat is _____?
(Hidden Heat) Heat added to a substance that changes its state without a change of temperature
Viscosity of fuel oil is a _____
Measure of internal resistance to flow
Sensible Heat is _____?
Heat that changes the substance, but not it’s state
Extra-heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ______ psi?
125 psi
What is the minimum size of a water column blowdown valve?
3/4”
What produces soft scale?
Calcium Carbonate & Magnesium Carbonate
A 3 element feed regulator senses what to control water flow?
Water level, steam flow, water flow
The purpose of the condenser in a refrigerant system is to…
Change the refrigerant vapor to liquid state
An air handler unit that has hot & cold ducts connected to (molding boxes) located in each building space is called?
Dual Duct
How is a hydrostatic test performed?
Fill the boiler with 70° F water and raise the pressure to 1.5 MAWP
The feedwater stop valve is found between the _____
Boiler and check valve
A boiler has 2800 furnaces temperature and 600 stack temperature reading. What is the boiler efficiency?
78.57
Input-loss / input x 100
2800 - 600 x100 =78.57
What is the maximum range of pressure settings of all the saturated steam safety valves on boilers?
10% of the highest set valve
The furnace of an HRT (Horizontal Return Tubular) Boiler is _____
Outside of the boiler shell
Waterwall should be blown down _____?
When the furnace is cool
What does zeolite water softeners system use as a means of regeneration?
Brine
A scotch marine boiler has _____
An internal furnace (firetube boiler)
Where do you find the superheat reading?
A. Get the suction line PSI and convert to temp
B. Get evaporator temp
C. Suction temp - evaporator temp = superheat
Which of the following types of pump can be started with the discharge valve closed?
Centrifugal
The height in feet of a liquid above a point such as pump suction is?
Static head
Which coal has the biggest level of fixed carbon content
Anthracite = 14,000
What do you call a reading from the center point of an impeller across to the gauge?
Static pressure
The heart of the refrigeration system is the ____?
Compressor
The _____ removes moisture from a refrigeration system
Filter drier
Name the wire that connects all components of a system to a physical ground or water pipe?
Grounding electrode conductor
Refrigerant flow into the evaporator is controlled by _____?
A metering device
The expansion tank on a closed loop system should be located, where?
On the suction side of the pump
What does the whistle on the top of the water column indicating?
High/Low water condition
How often should you check the low water fuel cut-off?
Once per shift
Why is oil added to the refrigerant?
To lubricate the compressor and keep the refrigerant migrating
When working on a boiler, permits would be required _____
For every shift
Which of the following is a positive displacement pump?
Reciprocating
Stay bolts are most commonly found on _____?
Firetube boilers
______ boilers can operate at higher pressures than fire tube boilers?
Watertube
