Production Engineering - Expected Questions in exams
(SSC JE, RRB JE, TNPSC AD, BHEL, HPCL, TRB Polytechnic Lecturer / Asst. Prof)
Welding - Set 2
1. The
maximum flame temperature occurs
(a) At the outer cone
(b)
At the
inner cone
(c) Between inner and outer cone
(d) At the torch tip
2. The
temperature of the inner luminous cone of neutral flame is about
(a) 1000 o C
(b) 1250 o C
(c) 2100 o C
(d)
3200 o C
3. A
neutral flame is obtained by supplying
(a)
Equal
volume of oxygen and acetylene
(b) More volume of oxygen and less volume of
acetylene
(c) More volume of acetylene and less volume of
oxygen
(d) None of the above
4. Neutral
flame used is used to weld
(a) Steel
(b) Cast iron
(c) Copper
(d)
All of
these
5. Linde
welding uses
(a) Neutral flame and left ward technique
(b) Oxidizing flame and left ward technique
(c)
Carburizing
flame and right ward technique
(d) Neutral flame and left ward technique
6. The
flux commonly used in brazing
(a) Zinc chloride
(b) Ammonium chloride
(c) Rosin plus alcohol
(d)
Borax
7. Galvanizing
is a
(a) Zinc diffusion process
(b)
Process
of coating zinc by hot dipping
(c) Process used for making thin phosphate coating
on steel
(d) None of the above
8. Which
welding process uses a consumable electrode
(a) Laser welding
(b) Thermit welding
(c) TIG welding
(d)
MIG
welding
9. Which
of the following is an example of semi-automatic welding process
(a) TIG welding
(b)
MIG
welding
(c) Submerged
arc welding (SAW)
(d) Resistance welding
10. Filler materials used in
(a) Spot welding
(b) Projection welding
(c)
Gas
welding
(d) Seam welding
11. In Arc welding , the arc length should be
approximately equal to:
(a)
Diameter of electrode rod
(b) One and a half time the diameter of electrode
(c) Twice the diameter of electrode
(d) Half the diameter of the electrode rod
12. The soldering process is carried out in the
temperature range
(a) 15 - 60 o C
(b) 70 - 150 o C
(c)
180 –
250 o C
(d) 300 – 500 o C
13. In Thermit welding Aluminium and iron oxide
are mixed in the proportion of
(a)
1 : 3
(b) 1 : 2
(c) 1 : 1
(d) 2 : 1
14. Which of the example of solid state welding?
(a) Gas welding
(b) Arc welding
(c) Thermit welding
(d)
Forge
welding
(e)
15. In arc welding temperature generated is of the
order of
(a) 8000 o C
(b) 1000 o C
(c) 3500 o C
(d)
5500 o C
16. The most commonly used flame in gas welding is
(a)
Neutral
(b) Oxidizing
(c) Carburizing
(d) Only C
17. Magnetic arc blow is
(a) A recent welding technique
(b) Used to weld material
(c) Occurs when welding near equator
(d)
Phenomenon
of occurrence of splatter because of magnetic fields created in d.c arc welding
18. Preheating is essential in welding
(a) High speed steel
(b) Stainless steel
(c)
Cast
iron
(d) German silver
19. In arc welding operations the current value is
decided by
(a) Thickness of plate
(b) Length of weld portion
(c) Voltage across the arc
(d)
Size of
the electrode
20. Pick up the incorrect statement about MIG
welding
(a)
No flux
required
(b) High welding speed
(c) Increased corrosion resistance
(d) Even unclean surface can be weld to obtain sound weld
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