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Which of the following is false regarding welding process and its corresponding minimum thickness of plate material?
Shielded-Metal Arc or Stick Weldments: minimum thickness - 1.5 mm
Submerged Arc Weldments: minimum thickness - 4.5mm
Flux-Cored Weldments: minimum thickness - 4.5 mm
Gas-Metal Arc Weldments: minimum thickness - 0.5 mm and even thinner
The resistance welding process suitable for welding ferrous and non-ferrous metals upto 8mm thickness is
Spot welding
Projection welding
Butt welding
Pressure welding
Which of the following is not a resistance welding?
Spot welding
Butt welding
Pressure welding
Percussion welding
Which of the following processes do not use flux during welding?
Submerged Arc
Oxyfuel
Flux Cored Arc
Friction
Which of the following is a design recommendation for welding?
Welded assemblies should have more parts
Welding should be done horizontally, with the stick or electrode holder pointing upward during welding
The buildup of weld fillets should be kept to a minimum
Locate welds where special finishing operations are required
Which of the following joint have high corrosion resistance?
Welding joint
Riveted joint
Bolted joint
None of the above
In fusion welding, penetration is the ratio of
width of the weld to its depth
length of the weld to its depth
depth of the weld to its width
depth of the weld to its length
Which one of the following is a temporary joint?
Welded joint
Riveted joint
Soldered joint
Press fit joint
In an acetylene cylinder, the acetylene is dissolved in
Water
Carbon Dioxide
Acetone
Mercury
One of the functions of electrode coating is
to increase welding current
to stabilize the arc
to prevent rusting
to control arc temperature
In a gas cut plate, the cut shows grooves and has deep drag lines. This is due to
tip too close to the cut surface
too much travel speed
less oxygen pressure
smaller size cutting nozzle
What advantage does the 74HXX series device have over standard TTL?
reduced propagation delay
higher propagation delay
low power consumption
lower voltage requirements
Unused inputs on TTL, AND, and NAND gates
degrade the gates noise immunity.
if left open will have the same effect as HIGH inputs.
should be tied HIGH.
All of the above are correct.
Typical TTL LOW level output voltage is
0.3 V.
0.0 V.
3.4 V.
4.0 V.
Typical TTL HIGH level output voltage is
0.3 V.
5.0 V.
3.4 V.
4.8 V.
The upper transistor of a totem-pole output is saturated when the gate output is
shorted.
HIGH.
logic 0.
LOW.
The upper transistor of a totem-pole output is OFF when the gate output is
logic 1.
malfunctioning.
HIGH.
LOW.
The unused input for a NOR gate should be tied to
HIGH.
ground.
another unused input.
both B and C
The time it takes for an input signal to pass through internal circuitry and generate the appropriate output effect is known as
propagation delay.
rise time.
fan-out.
fall time.
The time it takes for a square wave to go from 90% to 10% of its voltage level is called
rise time.
fan-out.
fall time.
propagation delay.
