# Randoms Flashcards

1
Q

Stress cracking is most likely to occur when welding thick material. This is due to:

a. Undercutting and nicking
b. Decreased cooling effect
c. Hydrogen embrittlement
d. Increased cooling effect

A

d. Increased cooling effect

2
Q

In producing a drawing for a scale of 1:20, what would the distance represented by a distance on the drawing of 6 inches be:

a. 120 feet
b. 12 inches
c. 12 feet
d. 120 inches

A

d. 120 inches

3
Q

The best form of distortion control when placing fillet welds on a long T-joint is:

a. Rigid clamping
b. Welding sequence
c. Sub assembly
d. Prebending or setting

A

b. Welding sequence

4
Q

If the current is a flow of electrons they move in what direction:

a. From positive to negative
b. From negative to positive
c. They alternate each half cycle
d. They flow on positive side of neutral line

A

b. From negative to positive

5
Q

The type of power source with a drooping volt-amp characteristic is:

a. C.A.V.
b. C.C.
c. C.P.
d. C.V.

A

b. C.C.

6
Q

That portion of the joint to be welded where the members are closest to each other is termed:

a. Root edge
b. Root face
c. Root gap
d. Root opening

A

b. Root face

7
Q

In a butt joint with the plates vertical and axis of the weld horizontal, the test position would be designated:

a. 4G
b. 3G
c. 2G
d. 1G

A

c. 2G

8
Q

How many principal views are there in an orthographic drawing:

a. 3
b. 4
c. 5
d. 6

A

a. 3

9
Q

If the time taken to pass through zero is minimized, there is a better chance the plasma will not completely collapse and the arc can be re-established. This system for improving arc stability in G.T.A.W. with A.C. is known as:

a. Correcting for unbalanced circuit
b. Waveform shaping
c. Surge injection
d. High frequency attenuation

A

b. Waveform shaping

10
Q

The type of gas formed by the interaction of ultraviolet light, emitted from the arc, with the oxygen in the air is:

a. Phosgene
b. Carbon Monixide
c. Ozone
d. Carbon Dioxide

A

c. Ozone

11
Q

The magnitude of current flow is measured in:

a. Ohms
b. Volts
c. Amps
d. Watts

A

c. Amps

12
Q

If a worker is standing next to two machines, each producing a noise level of 95 dBA, what noise level is the worker exposed to:

a. 92 dBA
b. 95 dBA
c. 98 dBA
d. 190 dBA

A

c. 98 dBA

13
Q

If the secondary coil has fewer turns in the primary coil, this is known as what type of transformer:

a. Step-up
b. Stationary
c. Step-down
d. Tap-type

A

c. Step-down

14
Q

Which of the following fuel gases are lighter than air:

a. Propane
b. Butane
c. Propylene
d. Acetylene

A

d. Acetylene

15
Q

When using the G.T.A.W. hot wire process, the power source for filler metal preheat is usually:

a. A.C.H.F.
b. D.C.E.N.
c. A.C.
d. D.C.

A

c. A.C.

16
Q

The force or pressure with which an electric current is forced through a circuit is known as:

a. C.A.V.
b. E.M.F.
c. C.P.
d. Volts

A

b. E.M.F.

17
Q

A product used in electrode coatings intended to operate on A.C. is:

a. Cellulose
b. Rutile
c. Potassium
d. Iron powder

A

c. Potassium

18
Q

Fusible plugs melt as low as:

a. 165°F
b. 195°F
c. 212°F
d. 240°F

A

a. 165°F

19
Q

When using direct current electrode negative with the S.M.A.W. process the type of penetration and weld width would be:

a. Deep and narrow
b. Deep and wide
c. Shallow and wide
d. Shallow and narrow

A

c. Shallow and wide

20
Q

Ohm’s law is:

a. R = V x I
b. I = R x V
c. R = I/V
d. R = V/I

A

d. R = V/I

21
Q

In G.T.A.W. electron flow is:

a. From positive to negative
b. From negative to positive
c. Alternates every half cycle
d. Travels constantly in the same direction

A

b. From negative to positive

22
Q

A capped steel is similar to:

a. Rimmed steel
b. Semi-killed steel
c. Killed steel
d. None of the above

A

a. Rimmed steel

23
Q

In Canada, most welding machines are connected to a high voltage supply of:

a. 575 volts
b. 480 volts
c. 240 volts
d. 120 volts

A

a. 575 volts

24
Q

The proportion of parent metal melted into the weld is known as:

a. Buttering
b. Tranfser
c. Dilution
d. Solidification rate

A

c. Dilution

25
Q

A method by which gases, principally hydrogen and oxygen, are removed by exposing the molten metal to low pressure is known as:

a. Vacuum pressurizing
b. Vacuum gassing
c. Vacuum depressurizing
d. Vacuum degassing

A

d. Vacuum degassing

26
Q

A shunt generator is:

a. Separately excited
b. Self-excited
c. Nonexcitable
d. Brushless

A

b. Self-excited

27
Q

The electrode coating containing titanium dioxide is:

a. Cellulose
b. Rutile
c. Potassium
d. Iron powder

A

b. Rutile

28
Q

When the current reaches a certain level the magnetic field will tend to overload and further increases in current will not increase the field. This is known as:

a. Induction
b. Saturation
c. Resistance
d. Impedance

A

b. Saturation

29
Q

What are good properties of the following alloys?

Nickel
Chromium
Molybdenum

A

Nickel - Corrosion resistant (Ni)
Chromium - Hard metal with high melting point (Cr)
Molybdenum - Withstands extreme temperatures (Mo)
Vanadium - Soft and ductile - Structural steel (V)

30
Q

What does a blast furnace use?

A

Iron ore / limestone / coke

Limestone removes impurities

31
Q

What happens in a blast furnace?

A

Oxygen is blown into the molten liquid metal and removed by deoxidation with silicon and aluminum

32
Q

What is killed steels?

A

Killed steel is fully deoxidized with silicon and aluminium.

33
Q

What is killed steel used for?

A

Fully killed steel is used for the core wire in electrodes

34
Q

What does calcium do in steel

A

Improves through thickness ductility

35
Q

What happens when you crop an ingot to high of killed steel?

A

Lamination may occur when rolling into plate.

36
Q

What does small grain size do?

A

Increases strengh and toughness