Level Exam Sample Flashcards
Where would you use an intercooler?
In between stages
Correct placement of shims?
Biggest first, next on top, smaller in the middle
Where do you get the measurement for vertical angular misalignment?
Coupling
Where is a relief valve located?
Where ever pressure is built up/after pump
What decreases leakage from the volute to the eye?
Wear plates/rings
Procedure for dismantling a fan after loto?
Block the blades
What do you do after a weld repair on a fan?
Check for balance
Gland tight and still leaking?
Change packing
What pump contains a crescent?
Internal gear
What valves are used for free flow in one direction and controlled flow in the other?
check valve
What valve is used in a quick disconnect?
Check valve
What increases friction in hydraulic lines?
Bends/fittings
Definition of a schematic?
Shows the internal or external layout of a system
What is a pilot line?
Dotted lines (hidden line)
Cause for hydraulic ram not moving or moving slow?
Seals leaking on piston
Why do you keep a space when soldering copper pipe?
To allow for capillary movement
What do stainless steel pipe carry
corrosives/acids
Second valve cap still getting hot after replacement?
Blockage in line
What instrument is used to detect softfoot?
Dial indicator, feeler gauges and laser
What is the outcome of sheaves/couplings aligned on a fan?
Longer life, more dependability, life expectancy, more efficient
How is pressure measured?
Psi/KpA/Bar
What will be a sign of misalignment?
Vibration
What safety precaution do you perform before starting an alignment?
loto, deenergize
What safety precaution is taken when working on a fan that is already LOTO?
Block the blades
When pressure increases velocity ____________
decreases
What is affected by a thin gasket on an axially split pump?
Tighter clearances
How is capacity changed on an axial pump?
Adjusting impeller/change blade pitch
What type of valve is the most precise for flow control?
Needle valve
What is the biggest size of pipe that can be used in a handheld pipe bender?
1⁄2
How are solenoids operated?
Electrically/ spring return
Which valve cannot be used for throttling?
Gate
What is the confined space attendants job?
Notify rescue personnel
2 types of seals used in pumps ?
static and dynamic
Where is the motor sought in a dynamic position?
In line when at operating temperature
Higher in static position
Why would a coupling purposely be misaligned?
Thermal growth
What action takes place after a rough alignment?
soft foot
What is a permanent benchmark?
A known elevation or reference point
What order does Lubricator, filter, regulators go in?
FRL
In a vane pump, how do you increase capacity?
Move reaction ring off centre
Half in schedule 40 pipe ID
0.622
How do you increase pump capacity?
Increase RPM/change impeller
How do you adjust compressor output?
pressure switch/regulator
What shows the interchange connection between components?
dot in the center of a cross
What is the purpose of a poppet in a gas accumulator?
Bladder doesn’t get sucked in accumulator
What do you do when the pump does not have enough pressure to overcome the load?
adjust pressure relief valve
At what location are dial measurments usually taken on a coupling/shaft?
3, 6, 9, 12
How accurate is an optical level?
0.001”
How do you determine which pedal block is higher using an optical level
lowest number
What fan type/blades are hollow?
airfoil
How is fan pressure measured?
cubic feet per minute
What is the purpose of a steam trap?
Trap moisture/dirt
How is air pressure relieved after a regulator?
Back to atmosphere
What is it called when air leaks back into the inlet?
slip
VA VO HA HO?
Rough alignment
What two valves make up a meter out system?
Flow control/ check valve
How is piston clearance set?
Turning the piston rod into or out of the crosshead
What determines clearance end in a cylinder?
The volume remaining when piston is at the end of stroke
What is the average air humidity percentage at sea level?
62% or 64%
What valve is used for suspended loads in hydraulics?
counter balance
How is air reversed in a pneumatic motor?
Flip cam and rotor over for one way motor
How is a 3-port valve identified?
3 ports for flow
Which valve is needed for a double acting cylinder?
4 port/3 pistons
What is psig at the compressor inlet at sea level
0
What would be the cause of insufficient discharge pressure in a pump?
normal pump wear
What is the purpose of a detent?
To hold a position
What is a wear ring clearance/tolerance?
3 times its initial clearance
What valve is used with an accumulator?
shut off valve (gate, globe, ball)
What happens when the discharge valve is closed on a positive displacement pump?
pressure increases
What are the types of hydraulic pumps?
radial/axial
Why would a coupling be purposely misaligned?
Thermal growth
If volume is deceased by 1/4, what happens to the pressure?
increases
What tool is used to measure air pressure?
pressure gauge
What measures the amount of air going through a system?
flow meter
What is the most efficient compressor layout?
loop system
What length of post do you use in a laser alignment system?
short as possible
What pressure does a pump normally have to overcome to move fluid?
head pressure (pump head)
A tank has a the following measurements. Find the capacity of the tank in imperial gallons.
Length: 45 inches
width: 20 inches
height: 55 inches
Volume = l x w x h
Volume = 45” x 20” x 55”
Volume = 49,500 cubic inches
Convert cubic inches to imperial gallons divide by 277
49, 500/277 = 178.7 imperial gallons
Which pump impeller is best suited for thick stringy substances?
Semi-open impeller (open impeller with scallop shroud)
What type of blades are the most efficient in a fan?
air foil
What type of piping is used in hydraulic systems?
pickled and oiled
What is the formula for the area of a cylinder?
Area = 2πrh+2πr^2
What does NPT stand for?
National Pipe Thread
What does ISO stand for?
International Organization of standardization
Which diameter stays constant with pipe?
Outside (up to 12 inches)
Why is liquid sometimes injected into the vacuum stream of a lobe blower?
to increase efficiency
What is the purpose of the volute in the discharge of a centrifugal pump?
increase pressure
What is the recommended amount of slack for a horizontal, one direction chain drive?
2%
What do you check after a new motor is fitted to a centrifugal pump?
rotation
What is required when working from heights?
Fall arrest
Why is coolant or cutting oil used when drilling?
To protect the metal you are cutting/bit/cooling purpose
A new blower fan is installed in a high temperature environment. Which type of drive is required?
Chain drive
A cylinder of gas under a pressure of 1,800 psig at 70 °F heats up to a temperature of 130 °F. What is the new pressure within the cylinder? (Charles Law questions)
P1/P2 = T1/T2
First convert psig to psia = 1,800 + 14.7 = 1814.7
Convert F to Rankine = 70 + 460 = 530
= 130 + 460 = 590
1,814.7/ n = 530/590
n = 2020.138 psia
______ inches = 1 psig
27.7
1 psia = ______kPa
6.89
_____ psi = 1 foot
0.433
______ degrees Celcuis = 273 K
0
______degrees Celcius = 0 K
-273
0 *F = _____ Rankine
459
1 us gallon = ______ square inches
231
1 bar = _______psi
14.5
1000 cm3 = ____ litre
1
________ inches3 = 1 imperial gallon
277
29.92 Hg = _______ psi
14.7
