1.
. MMA welding was invented in:
2.
Early MMA welding used:
3.
Coated electrodes were developed in:
4.
The Kjellberg process was invented in:
5.
MMA welding is suitable for:
6.
MMA can be performed in:
7.
The final weld quality primarily depends on:
8.
Arc temperature in MMA welding is approximately:
9.
The flux coating produces:
10.
Solidified slag must be:
12.
. Typical electrode angle for MMA welding:c
13.
MMA power source must be:
14.
Electrode ovens typically hold electrodes up to:
15.
Welding visors should be rated for:
16.
DC welding current flows:
17.
AC welding current flows:
18.
Typical MMA welding voltage range to maintain arc:
19.
OCV should not exceed:
20.
Constant current output ensures:
21.
Welding current level is determined by:
22.
Low amperage can cause:
23.
High amperage can cause:
24.
Arc voltage is measured between:·
25.
Arc voltage controls:
26.
Arc voltage controls:
27.
Arc voltage too low causes:
28.
Arc voltage too high causes:
29.
Travel speed affects:
30.
. Travel speed too fast causes:
31.
Travel speed too slow causes:
32.
DC+ve polarity in MMA:
34.
. AC welding distributes heat:
35.
MMA electrodes are classified into:
36.
Rutile electrodes contain:
37.
Rutile electrodes are suitable for:
38.
Rutile electrodes features:
39.
Basic electrodes contain:
40.
Basic electrodes are used for:
41.
Basic electrode features:
42.
Cellulosic electrodes contain:
43.
Cellulosic electrodes provide:
44.
Cellulosic electrodes provide:
45.
Cellulosic electrodes are suitable for:
46.
MMA electrodes may not all be:
47.
Operating factor (O/F) is:
48.
MMA O/F is approximately:
49.
. Semi-automatic MIG/MAG O/F is:
50.
Fully automated welding O/F is:
52.
MMA equipment includes:
53.
Typical welding imperfections:
54.
. Slag inclusions are caused by:
55.
Porosity is caused by:
56.
Lack of root fusion is due to:
57.
Undercut is caused by:
58.
Arc strikes are caused by:
59.
Hydrogen cracks are caused by:
60.
Successful MMA welding depends on
62.
Disadvantages of MMA:
63.
Electrode holder must be:
64.
Power return cable must be:
65.
Welding cables must be
66.
Electrode baking temperature:
67.
Welding visor protects from:
68.
Power sources for site work:
69.
. Inverter power sources are
71.
. Arc re-ignition without current surge is:
72.
Weld penetration depends on:
73.
Arc blow occurs with:
74.
Positive electrode (DCEP) concentrates heat:
75.
Negative electrode (DCEN) concentrates heat:
76.
Rutile electrodes provide:
77.
Basic electrodes are characterized by:
78.
Cellulosic electrodes are noted for:
79.
Operating factor affects:
80.
Semi-automatic welding O/F is:
81.
Duty cycle refers to:
82.
MMA welding uses power sources:
83.
Welding current controls:
84.
Travel speed too fast causes:
85.
Travel speed too slow causes:
86.
MMA welding arc length is controlled by:
87.
Excessive arc length may cause:
88.
Arc voltage too low may cause:
89.
Arc voltage too high may cause:
90.
AC welding frequency is:
91.
DC welding frequency is:
92.
Electrode burn-off rate is influenced by:
93.
Slag must be removed:
94.
MMA welding is suitable for:
95.
Typical amperage range for MMA:
96.
MMA welding equipment includes:
97.
In MMA, slag protects weld pool from:
98.
Main disadvantage of MMA is:
99.
Rutile electrodes are suitable for:
100.
Basic electrodes are mainly used for:
101.
Cellulosic electrodes are commonly used for:
102.
Arc blow occurs mainly in:
103.
AC current alternates how many times per second?
104.
MMA electrodes can be used with:
105.
Typical OCV for MMA welding:
106.
. High amperage causes:
107.
. Low amperage causes:
108.
Main protective feature of flux:
109.
Electrode oven temperature:
110.
. Inverter power sources are:
111.
Constant current output is also called:
112.
Welding voltage maintains:
113.
. MMA welding penetration depth is mainly affected by:
114.
AC MMA distributes heat:
115.
. DC+ve electrode directs:
116.
. DC-ve electrode directs:
117.
MMA electrode coating types include:
118.
Rutile electrode is used for:
119.
Basic electrode requires:
120.
Cellulosic electrode provides:
121.
MMA operating factor is linked to:
122.
Slag inclusions occur due to:
123.
Porosity occurs from:
124.
Undercut is caused by:
125.
Hydrogen cracks occur due to:
126.
Advantages of MMA include:
127.
Disadvantages of MMA include:
128.
Constant current power sources are preferred for:
129.
Constant voltage power sources are used for:
130.
Excessive travel speed leads to:
131.
Travel speed too slow leads to:
132.
MMA welding can use:
134.
Stable arc requires:
135.
Electrode burn-off rate affects:
136.
MMA welding final weld quality mainly depends on:
137.
Slag protects weld from:
138.
Basic electrode coatings are high in:
139.
Rutile electrodes contain:
140.
Cellulosic electrodes contain:
141.
MMA welding in all positions requires:
142.
Excessive amperage leads to:
143.
Too low amperage leads to
144.
Rutile electrodes are easy to:
145.
Basic electrodes are mainly for:
146.
Cellulosic electrodes are suitable for:
147.
MMA welding is versatile because:
148.
Slag removal is easier with:
149.
MMA welding generates:
150.
MMA welding operating factor is about:
151.
Duty cycle specifies:
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