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Austin's Sheet Metal 4th Year > Shop TQ Prep > Flashcards

Shop TQ Prep Flashcards

1
Q

If you had a 120 ton brake and you are braking a 6’ piece of material how many tons per foot would you have?

A

20 tons per foot of breaking power

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2
Q

What is the allowance for inside dimensions?

A

Add 20%

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3
Q

What is the allowance for outside dimensions?

A

Subtract 80%

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4
Q

What is the amount of travel of the moving beam that is adjustable on press brakes?

A

Stroke Length

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5
Q

What is the distance between the lower surface of the top beam and the upper surface of the bottom beam when the moveable beam is at its maximum stroke length with no dies in place?

A

Opening height

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6
Q

Name three types of bending on a power press brake.

A

Coining-stamping, Bottom bending, Air bending

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7
Q

What is the name of the upper and lower bending tool on a power brake?

A

Upper is punch, bottom is die

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8
Q

What do stainless steel, aluminum, and zinc have in common?

A

Difficult to work with

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9
Q

What is the protective coating on stainless steel?

A

Chrome Oxide

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10
Q

When TIG welding, what shade lens number is required?

A

10-12 shade

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11
Q

After welding an alloy, how is the finish restored?

A

Polish and Buff

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12
Q

Which power hand tool removes small punches of metal?

A

Nibbler

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13
Q

Why is a throatless bench shear’s blade clearance so important?

A

For a clean cut with no burr

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14
Q

Which machine is used to form the male side of a Pittsburgh?

A

Easy edger

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15
Q

What must be adjusted when forming a female Pittsburgh on a hand brake?

A

Upper leaf

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16
Q

What is the proper distance between a stack and conical cap?

A

½ diameter of stack

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17
Q

When joining two pieces of metal, how much should a solid rivet stick through?

A

1½ diameters

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18
Q

How are spot welder tips held in place?

A

With tapers

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19
Q

When installing ACC for systems over 4000 FPM, what must the upstream edge be?

A

Covered with a nose bar

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20
Q

What is the best welding joint for a longitudinal seam on 16 gauge mild steel?

A

Lap

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21
Q

What type of layout is used for a Ship ventilator?

A

Triangulation

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22
Q

What is the minimum deck flange for a square roof jack?

A

Not less than 6”

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23
Q

What must be considered first when fabricating and installing duct on a hollow wall?

A

Type of fastener

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24
Q

Where does flashback occur?

A

Inside the line and torch handle

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25
Q

Who is responsible for scaffold maintenance on an industrial site?

A

Engineers

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26
Q

When bending 10 gauge aluminum on a hand brake, how far should the top leaf be set back?

A

3 metal thicknesses

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27
Q

What is the purpose of lacquer on brass?

A

Oxidizing

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28
Q

What is the double seam allowance for the bottom piece of a cylinder?

A

2W

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29
Q

Which flux is used to seal a Galvanized gum cup?

A

Muriatic

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30
Q

How is the face of pulleys on a motor adjusted?

A

Closer together to increase the speed

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31
Q

What is the first thing to be put down on a batten roof?

A

Cleats

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32
Q

What is the purpose of beads on a fascia?

A

Expansion

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33
Q

What is the bracket of a gutter attached to?

A

Fascia board

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34
Q

What is the proper way to repair a loose hammer head?

A

Wedge

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35
Q

What is the proper sequence for a material take off?

A

Duct, fittings, accessories

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36
Q

If a blower has a 10” pulley and turns at 1900 RPM, how many RPM would it turn with a 12” pulley?

A

1583

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37
Q

A blower designed to produce 5200 CFM. It is turning at 850 RPM and producing 4200 CFM. What RPM is required for maximum CFM?

A

1052 RPM

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38
Q

What is the proper screw to use when installing burglar bars?

A

One way slot

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39
Q

A shop has 12 sheets of scrap a day which is 2% of the material used. How much does the material cost that is not wasted?

A

$15,288.00

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40
Q

What is the total weight of a cylinder with a diameter of 52” and a height of 40” weighing 39 lbs/³’?

A

1911 lbs

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41
Q

What is the best location to store a natural fiber rope?

A

Cool dry place

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42
Q

If a piece of duct 26” x 14” has 2600 CFM, what speed is the air traveling?

A

1027 fpm

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43
Q

How much air would be in 20” x 12” duct if it was moving 1100 FPM?

A

1837 cfm

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44
Q

What is the best gas for welding a non-ferrous metal?

A

Argon

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45
Q

How is the load on electric motors expressed?

A

Amps

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46
Q

What method of layout is used on the dome end of an insulated tank?

A

Parallel

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47
Q

How many pipes enter a VAV?

A

One

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48
Q

What is a housekeeping pad?

A

Protect equipment from water

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49
Q

In GMAW welding, what are the control adjustments?

A

Wire speed and voltage

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50
Q

Can you fusion weld the inside corner of a 90° corner?

A

No

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51
Q

In the case of conflict regarding installation of equipment, who has jurisdiction?

A

Shop drawings

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52
Q

When bidding a sheet metal job, what do you require?

A

Complete drawings and complete specifications

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53
Q

What type of flashing would be used to cover the top of a parapet wall?

A

Coping

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54
Q

When is concrete sleeving installed?

A

Before concrete is poured

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55
Q

What would be the best method to cut gore patterns for 70 – 5 pc. 90° elbows?

A

Band saw

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56
Q

How is the diaphragm at the regulator of an oxy-acetylene adjusted to release gas?

A

Turn in adjusting screw, open valve handle

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57
Q

When lifting equipment, what is the first thing that should be checked?

A

Weight

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58
Q

What is the minimum ULC fire rating on a fire damper?

A

1 hour

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59
Q

What is the bend allowance for a 1” outside finished measurement on 10 ga. mild steel?

A

1” - 1t

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60
Q

What would cause a blower RPM to decrease by 10%?

A

Blower pulley size increased

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61
Q

What size of a hole is required for ¼” taps on ¼” thick material?

A

7/32”

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62
Q

What is the purpose of sealing duct joints in a high pressure system?

A

Reduce air leakage

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63
Q

Does all GMAW need shielding gas?

A

False

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64
Q

What is the best material to wear while welding?

A

Heavy denim

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65
Q

What must cylinders being stored or transported have?

A

Valves closed and protective caps securely in place

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66
Q

What is recommended for residual pressure in a depleted cylinder?

A

At least 25 psi

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67
Q

What is the most common mode of metal transfer when welding coated steel or stainless steel?

A

Short circuit transfer

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68
Q

What effect does changing the wire speed have on the voltage or amperage in the welding process?

A

The current varies with the amount of wire feed, increasing proportionately

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69
Q

Which organizations have written specs for filler metals?

A

AWS and CSA

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70
Q

What defect is most often produced by improperly stored wires?

A

Porosity

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71
Q

Which gas is the highest?

A

Hydrogen

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72
Q

What kind of gases are Argon and Helium?

A

Inert gases

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73
Q

What is pure argon used for?

A

As a shielding gas when welding non-ferrous metals

74
Q

What is carbon dioxide primarily used for?

A

Welding mild steel and low alloy steels

75
Q

What does helium provide when used as a shielding gas?

A

Uniform penetration pattern and broader weld bead result

76
Q

What is the V Die Opening?

A

Dimension of the opening of the bottom die

77
Q

How are all power brakes rated?

A

In tons

78
Q

If you are using a 120-ton brake that measures 10 feet in length, how many tons of braking power per foot do you have?

A

12 tons of braking power per foot

79
Q

What happens as the material becomes shorter in a brake?

A

The pressure becomes greater

80
Q

What is the correct formula for calculating a mitre in the field?

A

M=O×W/L

81
Q

Which of these materials is the most acid resistant: lead, steel, tin, copper?

A

Lead

82
Q

What does the hold down on a squaring shear act as?

A

A clamp to hold the metal in place and a safety guard

83
Q

When fabricating stainless steel fittings in a hand brake rated for 16ga mild steel, what gauge should not be exceeded?

A

20 Gauge

84
Q

What should be considered when lifting a load?

A

The weight should be no more than ¼ capacity of the crane

85
Q

What does spall indicate?

A

Fragments that break away from the edge of a hole in concrete

86
Q

What is the working pressure for acetylene?

A

15 lbs

87
Q

Why is more amperage required to TIG weld aluminum than stainless steel of the same thickness?

A

Aluminum is a better conductor of heat

88
Q

What indicates whether a scratch awl should or should not be used on Tinplate?

A

It will remove tin coating

89
Q

What is the allowance for an elbow seam?

A

⅛”

90
Q

How are copper sheets sized?

A

Ounces per square foot

91
Q

What type of welding uses ARGON as a shielding gas?

A

TIG

92
Q

What does the pitch of the rivets mean?

A

Distance between rivets center to center

93
Q

What is the best snip to use for cutting an outside circle or a large radius arc on 26ga material?

A

Combination snips

94
Q

What happens if a drill bit has been ground with lips of unequal length?

A

It will cut an oversized hole

95
Q

What type of stainless steel is Type 302 22-18?

A

A ferritic stainless steel with 18% Nickel and 22% Chromium

96
Q

How many teeth per inch on a hacksaw blade would be used for 26 gauge?

A

32

97
Q

What is the proper overhang for planking on a scaffold?

A

6” - 12”

98
Q

When bending 26ga galvanized material, how should the top leaf be set back?

A

1 metal thickness

99
Q

What is the metal surface that will most easily accept paint?

A

Satin Coat

100
Q

Where may pins not be driven safely?

A

Cast Iron

101
Q

Which material has the highest melting point?

A

Black iron

102
Q

Is it permissible to fire a pin in pre-cast concrete for duct hangers using an explosive actuated tool?

A

False

103
Q

What type of plastic can be reformed when formed?

A

Thermoforming

104
Q

What is the formula used for a wire edge on 28 gauge?

A

2 ½ times wire diameter

105
Q

What should you never use a file without?

A

A handle

106
Q

How is spring back compensated when bending sheet metal?

A

By over bending

107
Q

What safety device is found in acetylene tanks to prevent them from exploding?

A

Fusible and safety plug

108
Q

What material is best suited for fabricating an exhaust system to remove hydrochloric fumes?

A

PVC

109
Q

What happens when dissimilar metals react to each other in the presence of moisture?

A

Electrolysis

110
Q

What is PVC?

A

A thermoforming plastic

111
Q

What polarity is used for carbon arc welding?

A

DC negative

112
Q

What is the most malleable material?

A

Copper

113
Q

What metal is derived from Bauxite?

A

Aluminum

114
Q

What material is used for breaching on a boiler?

A

Black iron

115
Q

What is the primary function of a shielding gas?

A

Protect the puddle from atmospheric contamination

116
Q

What is the total allowance for a ¾” hammerlock?

A

2 ¼”

117
Q

On a roll forming machine with three rolls, which roll gives the adjustable clamping action on the material?

A

Bottom roll

118
Q

When using a hand punch, how far should the punch penetrate into the die?

A

1/16”

119
Q

Which position is E7018 welding rod used for?

A

All positions

120
Q

What is ferrous metal?

A

An alloy containing iron

121
Q

Which way should the teeth face when installing a hacksaw blade?

A

Forward away from the handle

122
Q

What is bronze an alloy of?

A

Tin and copper

123
Q

Which way are the threads on an O2 tank?

A

Right hand thread

124
Q

What hammer should be used for the best result when putting on a ½” outside flange on a cylinder made from 22ga. galvanized?

A

The peening edge of a riveting hammer

125
Q

What is the cutoff from the stretch-out of a conical cap multiplied by?

A

6.28

126
Q

When MIG welding Aluminum, what should the flow meter be set at?

A

20 Cubic feet per hour

127
Q

When using an acetylene cylinder, how far should the valve be opened?

A

¼ turn

128
Q

In the case of a flashback with an oxy-acetylene torch, which is turned off first?

A

Oxygen

129
Q

What should you wear when welding overhead?

A

A leather jacket

130
Q

What is an oblique cylinder?

A

Has parallel sides and a cutting plane at 90 degrees to the axis would not be a circle

131
Q

Are all sheet metal screws self-tapping?

A

True

132
Q

What type of snips are specifically designed for cutting light gauge round pipe?

A

Double cutting snips

133
Q

What is the main difference between ferrous and nonferrous materials?

A

Ferrous metals contain iron

134
Q

What is the purpose of flux?

A

Remove oxides and prevent them from reforming during the soldering process.

135
Q

Is a number 8 sheet metal screw larger than a number 6 screw?

A

Yes

136
Q

What is moisture and dirt on the surface of the wire electrode likely to cause?

A

Porosity

137
Q

What is the purpose of the shielding gas?

A

To prevent the weld metal from absorbing elements from atmospheric…

138
Q

What is the thermal conductivity of a gas?

A

It is the gas’s ability to conduct heat.

139
Q

Which gas has the higher thermal conductivity, argon or helium?

A

Helium.

140
Q

What type of gas is used to weld aluminum?

A

Argon which is approximately 1.4 times heavier than air.

141
Q

What is the typical flow rate for argon-oxygen shielding gas?

A

25 CFH (cubic feet per hour).

142
Q

What causes porosity in the weld metal?

A

Moisture.

143
Q

When can the guards on a power shear be removed?

A

Never, they are there for your safety!

144
Q

How much residual pressure at pounds per square inch should remain?

A

25 psi

145
Q

Name the three basic types of metal transfer methods in GMAW welding.

A

Short circuit transfer

146
Q

What sets the arc length and wire speed in welding?

A

Voltage sets the arc length and wire speed sets the heat

147
Q

If voltage is too low and wire speed is too high, what is this referred to?

A

Stubbing

148
Q

What type of welding does not require a shielding gas?

A

FCAW Flux cored arc welding

149
Q

What can be left on the mat if the shear knives are not kept sharp?

A

Burrs

150
Q

What is the piece that is mounted directly in front of the hold down fingers?

A

Knife guards

151
Q

What is a pedal attached by a cable or running the entire length of the shop?

A

Foot treadle

152
Q

What component sets up the length and materials gauge as well as adjusts?

A

Control panel

153
Q

What is the angle made between the upper and lower shear knives?

A

Rake angle

154
Q

Is it better to have a lower rake angle?

A

True

The cut will be of better quality.

155
Q

What is the distance between the upper and lower shear knives?

A

Blade clearance

156
Q

How are the blades kept in proper position on a swing beam style shear?

A

A drive system pivots the moving blade down on roller bearings

This mechanism ensures the blades maintain their alignment during operation.

157
Q

What type of shear only uses power when it is activated?

A

Direct drive mechanical shear

This type of shear is designed for energy efficiency.

158
Q

What material thickness can mechanical shears typically cut?

A

To 10 gauge and 12

Mechanical shears are optimized for cutting specific material thicknesses.

159
Q

What is the flat horizontal portion in front of the shear called?

A

The bed

The bed provides a stable surface for the material being cut.

160
Q

What is used on the side of the shear that keeps the material at 90 degrees?

A

Side gauge

The side gauge helps in aligning the material for accurate cuts.

161
Q

What part on the shear is adjustable, allowing you to make multiple cuts?

A

Back gauge

The back gauge can be set to specific measurements for repetitive cutting tasks.

162
Q

True or False: Mechanical shears are slower than other types of shears.

A

False

Mechanical shears are known for their speed and efficiency.

163
Q

Power shears are electrically run with the motor being of what two types?

A

Hydraulic or mechanical

164
Q

What is the cutting capacity range of power shears?

A

From 30 gauge to in excess of 1/4” plate steel

This indicates the thickness of material that can be cut.

165
Q

What does stainless steel do to the shear’s capacity?

A

Reduces the shear’s capacity

The specific percentage reduction is not provided.

166
Q

What is required to keep the blade beams in alignment on guillotine type shears?

A

Guiding system

This ensures precision during cutting.

167
Q

What can be adjusted on a guillotine type machine to suit the length of the cut?

A

The rake angle

Adjusting the rake angle can improve the quality of the cut.

168
Q

Good cuts cannot be expected on a strip that is smaller than _______.

A

8 times

This refers to the minimum size requirement for achieving quality cuts.

169
Q

How many times the material thickness should the die opening be if you are air bending material over 1/2” thick?

A

10 times the material thickness

This ensures proper bending without damaging the material.

170
Q

What can be done to ensure the most accurate method to determine bend angles?

A

Test piece

Using a test piece allows for adjustments before the actual material is bent.

171
Q

What is the biggest disadvantage of air bending?

A

Inconsistency of the bends due to the variation of metal thickness and strength

Air bending relies heavily on uniform material properties.

172
Q

Is it ok to bend material using numbers above the bolded numbers?

A

No, it is dangerous and will cause unsafe pressures

Exceeding recommended limits can lead to equipment failure or accidents.

173
Q

Is it acceptable to remove the guards on a power shear?

A

No

Guards are essential for safety and should never be removed during operation.

174
Q

What are the two design types of power squaring shears?

A

Guillotine (slider)

These types of shears are commonly used for cutting sheet metal.

175
Q

What is the name of the upper bending tool on a power brake?

A

Upper is punch

The lower tool is referred to as the die.

176
Q

What die can be used to straighten out material that has been formed?

A

Flattening die

177
Q

What are 2 disadvantages of working with rubber dies?

A
  • They deteriorate much faster
178
Q

What type of die can be used if a quality finish is desired?

A

Roll form or rotator dies

179
Q

Which is the most accurate method of bending?

A

Coining

180
Q

Which method of bending produces sharp corners with consistent accuracy?

A

Bottom bending

181
Q

How many times the material thickness should the die opening be when air bending material up to and including 1/2” thick?

A

8 times the material thickness

Austin's Sheet Metal 4th Year (13 decks)

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