Millwright Flashcards
(145 cards)
1
Q
Wire rope used to hoist personal breaking strength is 6000 lb. What is the max you can lift?
A
10:1=600 lbs
2
Q
There are 4 rollers moving in horizontal load. Weight is 48 tons. What is the minimum capacity allowed for 2 rollers?
A
48 Ton
3
Q
Where do you measure a wire rope?
A
Largest diameter
4
Q
Length of wire rope required to make 4 dead wraps over a drum?
A
Pie times D times 4
5
Q
Shackle has bad threads, what do you do?
A
Take it out of service
6
Q
Sling has acid damage, what do you do?
A
Take it out of service
7
Q
What do you attach 3 or more slings being used to choke a pipe to?
A
A shackle on hook
8
Q
What are scaffold planks made out of?
A
Rough fir
9
Q
What is area of crane outrigger block?
A
3:1 Take area of outrigger pad times 3
10
Q
What do you use to check for cracks on Aluminum fan blade?
A
Dye penetrant
11
Q
Belt on a crown pulley is out of alignment. What do you do?
A
Increase the crown
12
Q
Bridge on overhead crane is misaligned. What do you do?
A
Align rails
13
Q
When changing hacksaw blade, what steps would you take?
A
Loosen nut, install blades tooth facing forward, retighten
14
Q
On a new commissioned system, what is the first thing you do?
A
Bleed the lines
15
Q
A fully loaded flat belt is running off alignment, what do you do?
A
Re-adjust load to the centre of belt
16
Q
A bucket conveyor is jacking and dropping load, what is the problem?
A
Missing tooth on drive sprocket
17
Q
A secured pump mount, motor running high.
A
Follow manufacturers specs.
18
Q
Before coupling new installed motor to pump, what do you do?
A
Check motor rotation, then couple
19
Q
Compressor is run up, what do you re- torque?
A
Cylinder head cover.
20
Q
A v-belt is turning over in its sheave. What do you do?
A
Replace sheave.
21
Q
A fluid coupling is slipping, what do you do?
A
Add oil, check temperature.
22
Q
Store a cable jack…
A
Separately and coil rope.
23
Q
Know hand signal….
A
Boom up, hold the load
24
Q
Know hand signal….
A
Extend boom.
25
Wedge socket is used to?
Change out line frequently.
26
How many turns do you open an acetylene valve?
1 to 1 1/2 turns
27
Where do you add lubricant on roller chain?
Between link plates.
28
What does blue smoke coming out of exhaust pipe of engine indicate?
Worn piston rings.
29
You have uneven wear on a friction clutch, what is the problem?
Misalignment.
30
When cutting a steal, what flame do you use?
Neutral.
31
A pump when shut off is not staying primed, what do you check?
Foot valve.
32
When checking for pipe strain, where do you put your dial?
Discharge flange.
33
A tank is sitting unevenly on concrete, how do align permanently?
Shim then grout.
34
A pump produces 12 gpm, the reservoir tank only holds 9 gallons. The pump is overheating, what is the problem?
The tank is too small for the pump.
35
To prevent a load from rotating on you during a lift, what would you use?
A tagline.
36
A hydraulic fitting is leaking, what is cause.
Damaged ferrule fitting.
37
A fixed bearing on a pump is located where?
On the driver side.
38
A tank collapses inward while draining fluid. What is the cause?
Faulty or clogged vent.
39
When installing a filter on a hydraulic system, put it....
Upstream of pump inlet.
40
PSV on compressor is popping, why?
High system pressure
41
You are told to level .050 shim at 18." How many shims at 6'?
.050 divided by 18 * 72"=.2
42
What is the maximum allowed chain slack?
2%
43
A double stage reciprocating compressor oil is changed and is still overheating. Why?
Dirty inter cooler fins
44
When welding a long piece, how do you weld?
Stager weld and start welding from centre and work outward.
45
Hydraulic cylinder when retracting is hammering to the bottom. What would you do.
Use bigger cushion on cap end.
46
Leaking gas charged accumulator. What would you do?
Change the bladder.
47
Scribing 30" diameter circle, what would you use and how do you set it?
Use a trammel and set it to the radius.
48
Weight on 180 degree apart on shaft is?
Couple imbalance.
49
Coupling on motor and pump is open in the bottom and touching on the top, where would you add your shims?
Add shims on the front side of the motor.
50
An eye wash station is empty, what would you refill it with?
Potable water.
51
How do you store a new bearing?
Leave it in the package and store it in dust free environment.
52
What is the artificial respiration dealing with stationary engine?
Air is forced into engine
53
What controls the collapse of the primary field in the coil on an electronic ignition system?
Transistors
54
7:1 compression ratio, what is most likely causes of preignition?
Carbon deposits glowing red cause of detonation=low octane levels.
55
On a 4 cycle engine, intake valve opens + closes once while the crankshaft turns how many degrees.
720 degrees
56
What does a magneto ignition system consist of?
Coils(transformer), spark plug, generates its own power.
57
What is a micron?
Millionth of a meter .001 mm
58
Excessive crankshaft deflection will most likely cause?
Broken crank, or fatigue failure.
59
Propane and most gas carbs use a?
Spray bar or nozzle.
60
On a gasoline carb how is the amount of gas delivery controlled?
(Butterfly valve) throttle valve
61
What is the turbine called that has H.P. & L.P section on separate shafts?
Cross compound.
62
This component is a special soft ply between the top cover and the carcass to reduce impact damage to the carcass?
Breakers
63
Best arrangement for setscrews?
90 degrees apart
64
Wear rings are used to do what on a single suction overhung pump?
Prevent recirculation to intake from suction.
65
Balance holes are used on what kind of pump?
Centrifugal radial( open, semi, closed)
66
In a 2 stage recipe compressor, discharge pressure cannot be maintained because of what?
Leaking exhaust valves.
67
High intercooler pressure cannot be maintained of what?
Leaking intake on second stage.
68
E6010, type of first papa action?
Short whip.
69
Aeration in a hydraulic tank is caused by what?
Low oil level, leaking intake fitting, leaking pump seal, turbulence in tank.
70
Power plant combustor to the turbine is connected how?
Transition piece
71
Gas turbine, highest pressure is where?
Diffuser
72
Chain rides at the tips of the sprocket, what is the problem?
Chain stretched.
73
To camber a chain means what?
Create crest on bottom of chain.
74
Hydraulic pump checking, what 3 tools are needed?
Pressure gauge, flow meter, rpm tool
75
Quenching quickest method?
Water
76
Phase is measured by what?
Strobe light.
77
High vibration reading after start up, why?
Misalignment
78
Diesel misfire caused by what?
Bad injector
79
Black exhaust smoke in diesel indicates what?
Too much fuel (too rich)
80
Oil darkens from what?
Oxidation
81
What happens when a balanced spool valve if the oriface is plugged?
It will dump
82
High amp draw on vacuum blower. Amperage drops because?
Load.
83
Safety factor for personnel lifting?
10:1
84
Type of steel for tools?
Chromium vandelium
85
Over speed trip is mounted on what?
Shaft.
86
What happens in a face to back angular contact set up?
Controls thrust in only one direction.
87
Setting a tapered roller bearing what is the clearance?
1/3 total clearance.
88
Most turbine erosion takes place where in a steam turbine?
L.P.
89
Large blades are found where in a turbine?
L.P.
90
Class of extinguisher for sawdust?
Class A.
91
What part on a flexible steel grid coupling wears out first?
Steel grid.
92
Step up voltage device is called?
Transformers
93
Voltage is like pressure in hydraulics so we call the voltage?
Electrical pressure.
94
Amperage should be checked how?
In the circuit.
95
Voltage should be checked where?
E=I*R
96
Centrifugal blowers or compressor, control output is controlled by what?
Inlet throttling
97
Identify correct mounting of wire rope clips on wire thimble.
Saddle on live line.
98
Emergency blow down valves prevent?
Over pressuring system.
99
What does large diameter steam blading allow for?
High volume of steam.
100
What is used to help prevent steam leakage from blade sections?
Shrouding
101
Lacing is used in what section?
L.P. Section.
102
Labyrinth seals seal on the principle of?
Brunellies principal, turbulent, knife edges.
103
Carbon rings are machined because they?
Fit to very close tolerances?
104
Spherical bearings used on turbines to?
Compensate for sag on shaft?
105
For expansion on turbines sliding dovetail are used?
On rotor for holding reaction blades.
106
Name for stationary blades?
Nozzles.
107
What do the moving blades of a turbine connect to?
Disc or drum.
108
The transition piece connects the inner lines of the power plant combustor to?
Turbine, connects combustor chamber to turbine.
109
S.A.V. Is closed by?
Governor
110
Condensor in the turbine allows steam to perform more work by reducing pressure. True or false?
True, more efficient.
111
If you get fluctuating readings when you first start, wait for readings to settle
Hunting
112
Drive belt vibrations amplitude is most likely the highest in line with?
Sheaves, direction of belt is pulling on sheaves.
113
Vibration signal is also known as?
Signature or signal.
114
When taking vibration readings on bearings, the readings should be taken on?
Acceleration horizontal, vertical, axial.
115
What is gear mean frequency of a single gear reduction gear box with input speed of 36000 rpm and output speed of 1060 with 24 teeth pinion?
1440
116
If you are taking vibration readings under 600 rpm use?
Displacement
117
How are suction and discharge valves operated?
Differential pressure at pump.
118
What does volume on a centrifugal pump depend on?
Resistance to flow.
119
Where does maximum impeller wear widely with semi fluid solids?
Blade tips.
120
Major types of seals used in pumps?
Static dynamic.
121
When pumping clear uncontaminated H2O with constant pressure on suction side of pump, the stuffing box should work well with what kind of packing.
Solid packing.
122
What is the reason for using steam throttle valves on large pumps?
Direct connected valves require too much force.
123
What can be done to modify a reciprocating pump to make it provide a steady and continuous flow of liquid?
Add air chambers to outlet side(accumulator)
124
What happens when discharge valves are closed on centrifugal pump?
Discharge pressure goes down and the pump slips to max.
125
Gate valves are used as intake & discharge valves because of?
Low pressure loss.
126
What is the cause of low suction lift?
Manufactures ratings.
127
Which process is used to seal mechanical seals in an emergency?
Lapping.
128
How do you bring a coil of packing down to exact size?
Roll it with a piece of pipe.
129
What is the function of an electrical interlock to enable system that slips on startup?
Times the functions.
130
What is the probable cause of gravity take up system that slips on startup?
Take up weight too light.
131
On a belt conveyor that must be started under full load, what kind of drive should it be?
Fluid coupling.
132
What chain is best used in abrasive conditions?
Mill chain.
133
On an overhead conveyor with a compound vertical curve, the purpose of the straight section of track is?
To gain the required amount of elevation.
134
A belt that has a section of it that always runs out of alignment is probably caused by?
Improper or uneven splice.
135
Increasing co-efficient of friction on a drive pulley without increasing tension can be accomplished by?
Lagging snub pulley increases arc of contact.
136
Easiest way to change speed of conveyor?
Change sheave or sprocket diameter or VFD.
137
On a bucket elevator, the length of the splice should be?
Equal to the width of belt.
138
On pneumatic dust conveyor piping, the amount of wear is?
On the outside radius of elbow.
139
Millwrights measure electrical pressure with what kind of meter?
Volt meter.
140
What steps up or down voltage?
Transformer.
141
Bearings on electric motor, lock bearing is on what end of motor?
Drive end.
142
Most common way to reverse direction on a dc motor?
Reverse armature lead.
143
What is root cause analysis?
Why equipment failed.
144
Who is responsible for providing MSDS?
Suppliers.
145
Oxidizing material symbol is?
Flame on circle.
