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Millwright C of Q Prep > Flash Cards from 1994 prep course > Flashcards

Flash Cards from 1994 prep course

1
Q

where would a bottoming tap be used?

A

When you have a blind hole. tap can’t go all the way through

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2
Q

Tap drill size for 3/8-16 UNC thread?

A

3/8 - 1/16
= 0.375 - 0.0625
=.3125
= 5/16

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3
Q

What speed do you run a 1/2” bit drill when drilling low carbon steel?

A

R.P.M = (4 x Material cutting speed) / (DIA. of Drill bit)
=(4 x 100)/0.5
= 800RPM

MAT’L cutting speed
low carbon = 100sfpm. cast iron = 80sfpm. aluminum = 200 sfpm. Stainless = 55 sfpm

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4
Q

What are the fire extinguisher letters and symbol meanings?

A

A - Green Triangle - natural product - wood, cardboard
B - Red Square - Combustible - gas, paint, cleaning products
C- Blue Circle - Electrical - wire short, t.v.
D- Yellow Star - Combustible metals - magnesium, aluminum

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5
Q

Whatb speed do you run a 1/2” machine reemer compared to a regular drill?

A

1/2 to 2/3 the speed

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6
Q

What is the typical included angle of a drill for general purpose drilling?

A

118deg

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7
Q

what is the speed of a 5/16” drill in low carbon steel

A

R.P.M = (4 x Material cutting speed) / (DIA. of Drill bit)
=(4 x 100)/0.3125
= 1280RPM

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8
Q

Tap drill for a M12 x 1.75 thread

A

O.D - Pitch
12-1.75
=10.25mm

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9
Q

How far above the roof/platform should a ladder extend?

A

3 feet/ladder rungs

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10
Q

Where should a D-ring for a safety harness go

A

Center of back

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11
Q

How far from the wall should a ladder be if it extends up 24 feet?

A

4:1 ratio
=24/4
=6 feet

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12
Q

What standard do safety glasses comply to?

A

C.S.A
Canadian standards association

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13
Q

What instrument would you use to measure the shoulder of stepped hole to withing 0.001”?

A

Depth micrometer

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14
Q

What wrench would you use to ensure even uniform tension is applied to all bolts

A

Torque wrench

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15
Q

What type of bolt would you use to fasten a steel plate to wood? wood to a steel plate?

A

1.Lag Bolt
2. Carriage bolt

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16
Q

What pitch of hacksaw blade would be used to cut pipe?

A

32 pitch(32 teeth per inch)
fine pitch
precision tooth form

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17
Q

which way do you cut with a hacksaw

A

forward

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18
Q

what is the first tap you use when threading a hole

A

taper tap

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19
Q

how are numbers on a depth micrometer displayed differently than a standard micrometer?

A

the lines and read in reverse. numbers are covered up.

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20
Q

When measuring a bore diameter what instrument would you use?

A

inside micrometer

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21
Q

the distance between two thread peaks is called?

A

the pitch

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22
Q

What would you use to measure clearance between parts?

A

feeler gauges

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23
Q

what is the included angle of a UNF thread

A

60deg

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24
Q

what type of thread is used for the lead screw on a lathe? and what is the included angle?

A

ACME thread
29deg

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25
Q

What are grinding wheels made from for cutting steel? soft metals and sharpening carbide tools?

A

1.aluminum oxide
2. silicone carbide

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26
Q

ratio of a dividing head used on a milling machine?

A

40:1

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27
Q

Why and holes reemed?

A

For precision holes
drill a hole 1/64th undersized and then reem to prevent cracks and to improve stress relief

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28
Q

Weight of one cubic foot of steel

A

490 lbs/cu. ft

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29
Q

What does I.W.R.C mean in wire ropes

A

Independent Wire Rope Core

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30
Q

what does 6 x 19 mean with wire rope?

A

6 - strands
19 - wires per strand

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31
Q

how is rope measured?

A

across it’s greatest diameter

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32
Q

how much Crosby clips reduce the strength of a wire rope?

A

20%

33
Q

What is the S.W.L of a 1/2” wire rope?

A

S.W.L = safe working load=breaking strength
Formula = S.W.L = d^2 x 8
=0.5 x 0.5 x 8 = 2 tons

34
Q

What is a snatch block used for?

A

NOT used for lifting.
It is used to change the direction of pull on a load line and to gain mechanical advantage.

35
Q

when dealing with wire rope.
1.What is left/right lay?
2. what is regular/lang lay?

A

Left lay or right lay refers to the direction of the strands.
In a regular lay rope, the wires in the strands are laid in the opposite direction as the strands in the rope.
In a lang lay rope, the wires in the strands are laid in the same direction as the strands in the rope.

36
Q

Examples of fiber rope, Natural vs synthetic?

A

Natural - Manila, hemp, cotton
Synthetic - polyproline nylon

37
Q

S.W.L of 1” wire rope with an eye made with crosby clips

A

S.W.L = safe working load=breaking strength
Formula = S.W.L = d^2 x 8
=1.0 x 1.0 x 8 = 8 tons
8 tons x 20% deficiency
8.0 x 0.80 = 6.4 tons

38
Q

safety factor when lifting people

A

10:1 ratio

39
Q

S.W.L of 1/2” rope when lifting personnel?

A

S.W.L = safe working load=breaking strength
Formula = S.W.L = d^2 x 8
=0.5 x 0.5 x 8 = 2 tons
safety factor when lifting people 10:1
=2 ton / 10 = 0.2 tons = 400lbs

40
Q

What knot to use when joining two ropes of the same diameter

A

reef knot.

41
Q

When lifting a load what happens to the the stress on a sling as you decrease its angle from vertical?

A

As the angle gets less the stress in each leg will increase.
As you go from vertical to more horizontal the stress on the strap increases and as a result the lifting potential of the strap decreases.

42
Q

What type of knot provides a non slip loop what is used for hoisting

A

bowline knot

43
Q

What is a sheet bend used for?

A

Joining 2 ropes of different diameter

44
Q

what is a spreader bar used for

A

used to suppport/lift long loads. keeps the lift horizontal

45
Q

by how much % does a choker hitch reduce the lifting capacity

A

30%

46
Q

Name the3 most common sling configuration

A

single vertical hitch
Choker hitch
Basket hitch

47
Q

What is the recommended sling angle? what is the critical angle?

A

Recc- 45%
Critical - 30%

48
Q

what is the minimum thickness of a scaffold plank and what is the most common wood used?

A

2”x10” is minimum
Fir wood is first choice

49
Q

What is the safety factor for a sling

A

5:1

50
Q

How many Crosby clips are used on a 3/4” wire rope

A

4 clips
1/8-7/16 =2
1/2-5/8 = 3
3/4-1 =4

51
Q

how far apart should crosby clips be spaced?

A

6 x dia of rope

52
Q

in hoisting and rigging what are thimbles used for?

A

protects the eye of a sling from abrasion and rubbing

53
Q

hand signal for stop

A

arms crossing and moving out horizontally

54
Q

hand signal for travel

A

move arms in circular motion around each other in front of body

55
Q

hand signal for raise load

A

one hand, index finger pointing up, move in circular motion

56
Q

using a block and tackle that has a mechanical advantage of 10, to lift 5 tons. what is the pull on the lead line?

A

5 ton = 10000 lbs
10000/10(M.A)
=1000lbs a.k.a 1/2 tons

57
Q

what is the purpose of a tagline

A

control/guide the load from a safe distance. keep the load straight or turn it.

58
Q

6 foot prybar had a 2” long toe. what is the weight of load you can lift if you exert 150 lbs on the end of the prybar?

A

6 foot = 72”
72” x 150 lbs = 2” x load weight
load weight = (72x150)/2
load weight = 5400lbs

59
Q

what are the two major stresses a shaft is subjected to

A

twisting - the shafts resistance to turning
bending - caused by the weight of the shaft to sag between bearing support OR a sidways pull on a shaft

60
Q

Why do pump/drive shafts often have a center drill hole on the end of the shaft?

A

for mounting on a lathe to check for shaft deformation

61
Q

how much will a 10 foot shaft expand when there is a temp rise of 50deg. the material has a coefficient of expansion of 0.000006.

A

C.O.E x length x deltaT
0.000006 x 120” x 50deg
=0.036”

62
Q

what are keys used for on a shaft

A

provide positive drive with no slippage

63
Q

2 basic style of keys

A

rectangle and woodruff

64
Q

what is a parallel key?

A

a square key - all sides are even

65
Q

what is a pratt and whitney key

A

a boxed/square key that has both ends rounded

66
Q

what is a taper key

A

bottom and sides are square, top edge is tapered so it wedges in and is self holding

67
Q

what is a gib key

A

like a rectangular key but one end has a raised square of material for easy for removal

68
Q

what si the taper of a taper key

A

1/8” per 12”
1:96

69
Q

what is a feather key?

A

key with counter bored holes drilled in to screw/mount the key to the shaft

70
Q

what is a saddle key

A

the key rides on top of the shaft, bottom of the key is ground concave so it sit in position

71
Q

when would you use a step key

A

when the hub and the shaft are differently sized

72
Q

how many set screws and at what position should they be placed on a shaft

A

2 set screws 90deg apart

73
Q

What does a key number 608 designate

A

6 - width of key in 32nd - 6/32 = 3/16th
08 - length of key in 8ths - 8/8 = 1inch
so woodruff is 3/16th wide and 1 inch long

74
Q

What does a key number 1212 designate

A

12 - width of key in 32nd - 12/32 = 3/8th
12 - length of key in 8ths - 12/8 = 1 1/2inch
so woodruff is 3/8th wide and 1.5 inch long

75
Q

clearance fit vs interference fit

A

clearance - When the dia. of the hub is larger than the shaft. no force is required to put parts together
interference - when the hub is the same size or smaller than the shaft to external force is required to put parts together

76
Q

what are 4 methods for shrink fitting. to install a interference fit assembly

A

Oven, induction heater, oil bath, oxyacetylene dry ice, freezer, CO2, liquid nitrogen

77
Q

what is ambient temperature

A

the surrounding air temperature

78
Q

room has ambient temp of 70 deg. how much will a steel shaft with a 3” bore expand when heated to 480 deg.
C.O.E of steel = 0.00000633

A

c.o.e x length x deltaT

0.00000633 x 3” x (480-70)
=0.0073”

79
Q

why do induced draft fans require much more maintenance than other fans?

A

the fan is subject to more exhaust gas/material/dust moving across/over the fan. as these contaminants build up they lead to imbalance and damage.

Millwright C of Q Prep (1 decks)

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