Ip Studies Flashcards
(118 cards)
1
Q
Meter out flow control?
A
Controls the flow out of a cylinder to maintain speed
2
Q
Where is an oil groove located ?
A
Ontop
3
Q
What reduces leakage between inlet / discharge ?
A
Wear rings
4
Q
4 way dcv leaking ?
A
Creep/ drift
5
Q
Foaming in a hydraulic tank ?
A
Plugged vent
6
Q
90 degree sharp corner what type of sling ?
A
Chain
7
Q
Relief valves opening randomly?
A
Probley unloading at the compressor
8
Q
Bad sauttered joint?
A
Contamination
9
Q
Aligning shafts with level put in middle
A
10
Q
Type of bearing on a wind turbine?
A
Spherical roller
11
Q
Frl
A
Filter regulator lubricators
12
Q
An offset or half link will change pitch by?
A
1 pitch
13
Q
Master link reduces ? %
A
30%
14
Q
Slow to medium chain sag?
A
2-3%
15
Q
Medium chain speed sag
A
4-6?
16
Q
Chain elongation
A
Chain wear
17
Q
High speed stainless steel grinding wheel?
A
Aluminum oxide
18
Q
Balance hole helps?
A
Axial thrust
19
Q
Square key?
A
Transmits tourqe and timing
20
Q
Width of a square key
A
1/4 diameter of shaft ?
21
Q
Gib head key prevents?
A
Axial movement
22
Q
Tapered gib head key is
A
1/8”
23
Q
Min Sheave arc contact ?
A
120 degrees
24
Q
Classic series belt?
A
A,B ,C ,D
Ax = cogged
3v= high capacity
2L = light duty
25
Poly v belt?
High speeds
26
Toe board and wood type on scaffold?
Toe board 6” wood type rough cut fir
27
Scaffold base to height
3:1
28
Gfci?
Ground fault circuit interuptor
29
Elasticity =
Bends and goes back to shape
30
Ductility?
How easily something can bend
31
Toughness?
Ability of material to resist breaking
32
Hardibility
Resist penetration
33
Fatigue ?
Repeatedly stressed and ends up breaking
34
General drill point angle ?
Soft materials ?
Hard materials ?
General 118 degrees
Soft pointy
Hard wider 130 degrees
35
Backfire in a torch?
Pop pop sound , low gas speeds
36
Wire rope clips
6x diameter
37
How do you control output of a centrifugal compressor?
By metering input
38
Good arrangement of set screws ?
One on top one 90 degrees of that
39
Mitre gears are 1:1 and 90 degrees
True
40
Before using EAT tools u would?
Centre punch test
41
Only normally open valve?
Pressure reducing valve ,
42
How much wear and stretch on chains ?
Wear 10%
Stretch 5%
43
First angle projection?
44
3rd angle projection
45
1 1/4 - 7 UNC - 2A
1 1/4 = basic size
7 = threads per inch
UNC = thread series
A = thread symbol
46
M20 x 2.5 - 5g
M = metric
20= basic size (20mm)
2.5 = thread pitch
5= tolerance position
g= bolt
47
What type of drawing is the most common
Isometric drawings
48
Eat tools
Grey,brown, green, yellow , red , purple
3” spacing concrete
1/2” spacing on edge
2”
49
Woodruf key
First 2 digits /32. Last two digits /8”’s
50
Tap types
Taper/ plug/ bottoming
51
File types
Rough- course - bastard - second cut- smooth- dead smooth
52
Machine screw =
# x 0.013” + 0.060
53
Hoisting ratios
General 5:1
Workers 10:1
Elevator 20:1
Chain 4:1
54
Tapered down pin
1/4” per foot
55
Npt taper
3/4 per foot
56
Centre punch angle
90 degrees
57
Prick punch angle
30-60 degrees
58
Master precision level
0.0005”
59
Precision level
0.005”
60
Leave how much room for grout
3/4” - 1 1/2”
61
Ladders
4:1
62
What type of wire rope core do you use for lifting things and people
Iwrc
63
Safe lifting angle of slings?
60 degrees
64
Critical lifting angle
30 degrees
65
Blade kerf
Width of the cut the blade makes in the material
66
Drill sleeve
Takes tool from smaller to larger
67
Drill socket
Takes took from larger to smaller
68
Counter sink angle
82 degrees
69
Suction head
Supply above pump
70
Suction lift
Supply below pump
71
Wear rings
3x the initial clearance
72
Slip fit chain
Reduces capacity
73
#40 chain
4/8 then 0 means roller
74
#35 chain
3/8 5 = rollerless
75
How much elongation on a chain
3%
76
Hub designs A B C D
A = hubless
B = hub on one side
C= hub on both sides
D = split hub
77
V belts transmit power by?
Gripping the sides in a pulley
78
3 basic catagories of couplings
Rigid
Flexible
Special purpose
79
2 types of clutches used for roll back
Roller ramp / sprag
80
Friction clutches engage at
Any speed / they slip under shock loads
81
Pre lubed bushing ?
Porous bronze / lube pocketed
82
Hydro dynamic bearing
Depends on rotation of shaft to create oil wedge
83
Hydro static
Depends on external pump to support the load
84
Oil lift
Pump is on for start up
85
Purpose of the cage when it comes to bearings
Push the rolling elements thru the unloaded zone
86
Max heat for a bearing
120 degrees c or 80 degrees if it’s sealed
87
Brinelling
Oops we fucked up
88
False brinelling
Transport sorts deal
89
Fire xtingguish
A = ash wood and paper
B = boom flammable
C= circuit / electrical
D = DEATH METAL FORK YA
90
Acetylene max working pressure and Critical pressure
Max working psi 15
Critical pressure 28
91
What measures fan pressure
Manometer
92
Forced draft =
Pushing out
93
Induced draft
Pulling in
94
Balanced draft
Pulling and pushing air
95
Perfect vacuum for
-14.7 psig
96
Absolute pressure =
14.7 Pisa @ sea level
97
Gauge pressure
14.7+ psi a
98
Npshr
Net positive suction head required
The minimum absolute pressure required at the suction port of the pump to prevent cavitation
99
Regenerative turbine pump
Pump used for relatively high heads and low flow applications
Stripper is the seal?
100
Location of the discharge port in a screw compressor dictates?
Determines the pressure ratio
As the discharge gets smaller and closer to the centre the higher the ratio
101
Overall efficiently in a screw compressor
Effected by leakage . When compressor runs faster the effcientcy increases!
102
Capacity of a screw compressor and lobe profiles
Capacity is based off rotor length diameter and profile , bigger rotor or longer delivers greater volume
Asymmetrical better seal and efficiency over symmetrical lobes
103
Fixed bearing location on screw compressor
Dishcharge side , clearances on the ends must be only 2 to 3 thou to minimize leakage
104
Bearing types and arrangement for screw compressor
Discharge fixed with tapered roller bearing
Suction must be free to float using cylindrical roller bearing
105
Wet screw compressor air must pass thru what type of filter
Coalescing filter element
106
Scavenger line is used where
Pulls oil from the separator element and is fed back into the compressor
107
What shows up as a high discharge temp on screw compressor ?
Loss of oil pressure
Rotor rub from loss of bearings
108
Keeping the ___ at a minimum temperature also prevents moisture from condensing out of the air inside the compressor
Oil
109
Oil injection location on screw compressor
Low pressure section towards suction to allow pressure differential to push the oil into the compressor
110
Oil free screw compressors require ?
Timing gearsb
111
Drawback of oil free screw compressors
Low compression ratio
112
Oil free screw compressors require what between stages
Intercoolers
113
Air cooled casings are used unless the heat from compression gets to great in that case cooling is usually accomplished by
water jackets around the compressor
114
Water injected screw compressor
Greatly increases the volumetric efficiency through improved sealing , reduced temperatures and reduced hp requirements
115
Water injected screw is like
Like a wet screw but the separator is used to store air and separate out the water instead of sepersting out the oil
116
Rotary valve is a
Efficient way of unloading a screw compressor
117
Slide valve
No ports or a turn valve like the last one it’s a full peice that slide in or out to change displacement ( more efficient ) suitable for refrigeration
118
Manufacturers recommend filter separator element replacement after
10-12 psi drop across the filter
Another sign that would indicate replacement would be excessive amount of oil carryover in dishcharge lines
