Test Questions Part 4 Flashcards
Electric arc temperatures may be as high as:
4250°C
5325°C
7450°C
8300°C
8300°C
Cast iron boiler capacity:
Is very large compared to steel boilers
Can be increased by simply adding sections
Cannot be increased once assembly is completed
Can be increased by increasing section size
Can be increased by simply adding sections
A “U” tube manometer may be filled with:
A granular substance
Nitrogen
Ethyl alcohol
Light oils
Light oils
Electrical power can be determined by the formula:
P = E x I
P = E x R/I2
P = I x R x E
P = I x R
P = E x I
Increasing the spring tension in a pressure reducing valve will ___________________.
Reduce or minimize the cycling or “hunting” of the valve
Decrease the regulated pressure downstream of the valve
Allow for maintenance to be completed downstream
Increase the regulated pressure downstream of the valve
Increase the regulated pressure downstream of the valve
When is hot oil an ideal heat transfer fluid?
when high temperature process fluids are needed at low pressure
when high temperature, high pressure process fluids are needed
when glycol is too expensive
when low temperature process fluids are needed at high pressure
when high temperature process fluids are needed at low pressure
Which of the following affects the electromotive force developed by a DC generator?
Acceleration rate at which the conductors cut the magnetic lines of force
The diameter of the conductors
The type of conductors cutting the magnetic lines of force
The strength of the stationary field
The type of conductors cutting the magnetic lines of force
Putting a controller on manual control means:
The operator controls the final control element.
The controller output responds to a process variable.
There is no control of the final control element.
The operator manually adjusts the process by changing the process variable signal
The operator controls the final control element.
Which of the following would be used to reduce the temperature gradient in order to attain a slower cooling rate of a weld?
preheating the heat affected zone
air cooling the weld
quenching the component in water
post-heat the welded area
preheating the heat affected zone
A grease trap works on the principle that:
greases and water cannot mix.
centrifugal force can be used to enhance precipitation of greases.
greases with low relative density will float on the surface of water.
slow moving fluid streams allow the mixtures to separate.
greases with low relative density will float on the surface of water.
The capacity of a body to do work is defined as:
Energy
A PLC with an HMI can signal an alarm by: (choose all that are correct)
Sounding a siren or horn
operating a beacon
Flashing an equipment icon on the HMI screen
Turning the HMI screen a different colour
Sounding a siren or horn
Flashing an equipment icon on the HMI screen
Turning the HMI screen a different colour
Question 2
When decommissioning a plant,
all waste must be disposed of.
the ground must be left in a non-toxic state.
a groundwater impact survey must be done.
the site must be left in a condition suitable for an alternative use.
the site must be left in a condition suitable for an alternative use.
Plastic foam pipe insulation is:
Used for high temperature service on elbows
Used for refrigeration piping only
Used for lower temperature purposes
Often installed by the welders
Used for lower temperature purposes
Which of these groups is the combustible components of coal?
Nitrogen, oxygen, ash
Carbon, hydrogen, sulphur
Carbon dioxide, nitrogen, sulphur dioxide
Carbon, ash, nitrogen
Carbon, hydrogen, sulphur
Stays are not normally required in watertube boilers because:
Space does not permit their installation
They would block access
The pressure parts have no flat surfaces
The ASME codes only allow stays in firetube boilers
The pressure parts have no flat surfaces
The purpose of flux is to:
clean the welds after the procedure is done
prevent oxidation of the metals due to heat
promote the creation of “slag”
preheat the weld
prevent oxidation of the metals due to heat
Fire pumps usually start automatically with a signal from:
sprinkler head
water main pressure
Fire main pressure
smoke/heat detector
Fire main pressure
A Van Stone flange is fitted ___________ on a pipe:
with tack welds
Using coarse threads
Loosely
With evenly spaced set screws
Loosely
In order to get maximum heat transfer in a bubbling bed furnace, it is necessary to:
Increase the fuel consumption per hour
Ensure that the boiler tubes are covered by the expanded bed
Add fuel gas to the regular fuel being burned
Operate the sootblowers more frequently
Ensure that the boiler tubes are covered by the expanded bed
The bimetal sensing element consists of a strip made up of two thin layers of metal with:
Similar rates of thermal expansion
Different rates of thermal expansion
Different specific heats
Different resistances
Different rates of thermal expansion
A liquid waste such as a caustic boiler cleaning liquid:
must be incinerated.
isn’t pollution unless it enters the environment.
must be stored in appropriate barrels.
must be injected into deep wells.
must be incinerated.
Which of the following is a single pass boiler?
HRT
Scotch marine
Packaged firetube
Vertical firetube
Vertical firetube
A common continuous blowdown rate on many boilers is approximately:
10% of steaming rate
5% of steaming rate
1% of steaming rate
3% of steaming rate
1% of steaming rate
An element that increases creep strength in metal is:
Nickel
Vanadium
Molybdenum
Manganese
Molybdenum
In a cast iron modular heating boiler, the operation of the burner of each module is controlled by a _____ that starts or stops modules in sequence as load demand increases or decreases.
Temperature sensor
Step controller
Thermostat
Flow controller
Step controller
Mechanical centrifugal collectors are not suitable for the collection of _________ particles.
Very coarse
Coarse
Very fine
Particles with irregular shapes
Very fine
