Production Engineering - Expected Questions in exams
(SSC JE, RRB JE, TNPSC AD, BHEL, HPCL, TRB Polytechnic Lecturer / Asst. Prof)
Welding - Set 1
1. In
resistance welding pressure is released
(a) Just all the time of passing the current
(b) After completion of current
(c)
After
the weld cools
(d) During heating period
2. Oxygen
to acetylene ratio in case of oxidizing flame is
(a) 1 : 1
(b) 1.2 : 1
(c)
1.5 : 1
(d) 2 : 1
3. The
used for coating the electrode is called
(a) Protective layer
(b) Binder
(c) Slag
(d)
Flux
4. Which
of the following is not a welding accessory?
(a)
Cable
(b) Electrode holder
(c) Hand screen
(d) Gloves
5. The
transformer used for AC welding sets is:
(a) Booster type
(b) Step up type
(c)
Step
down type
(d) Equal turn ratio type
6. In
arc welding, arc is created between the electrode and work by
(a) Flow of current
(b) Voltage
(c) Material thickness
(d)
Contact
resistance
7. The
phenomenon of weld decay occurs in:
(a) Cast Iron
(b) Brass
(c) Bronze
(d)
Stainless
steel
8. In
electric resistance welding, pressure applied varies from
(a) 1 to 5 Mpa
(b) 5 to 10 Mpa
(c) 10 to 25 Mpa
(d)
25 to 55 Mpa
9. Seam
welding is a
(a)
Continuous
spot welding process
(b) Multi-spot welding process
(c) Arc welding process
(d) Process used for joining round bars
10. Projection welding is a
(a) Continuous spot welding process
(b) Arc welding process
(e)
Multi-spot
welding process
(c) Process used for joining round bars
11. In arc welding, the temperature of heat
produced by the electric arc is of the order of
(a) 3000 o C to 4000 o C
(b) 4000 o C to 5000 o C
(c) 5000
o C to 6000 o C
(d)
6000 o
C to 7000 o C
12. In shielded arc welding
(a) Large electrode is used
(b) Welding rod coated with slag is used
(c)
Welding
rod coated with fluxing material used
(d) None of the above
13. Which of the following welding method uses a
pool of molten metal?
(a) Carbon arc welding
(b)
Submerged
arc welding
(c) TIG welding
(d) MIG welding
14. In welding copper alloys with TIG arc welding
(a)
Direct
current with straight polarity used
(b) Direct current with reverse polarity used
(c) Alternating current used
(d) Any
one of these
(e)
15. Which
of the following welding process uses non-consumable electrodes?
(a)
TIG
welding
(b) MIG welding
(c) Manual arc welding
(d) Submerged arc welding
16. Thermit, used in thermit welding , is a
mixture of
(a) Charcoal ang iron oxide
(b) Charcoal and Aluminium
(c)
Iron
oxide and Aluminium
(d) Charcoal, iron oxide and Aluminium
17. Thermit welding is often used in
(a) Replacing broken gear tooth
(b) Repairing broken shears
(c) Joining rails, truck frames and locomotive
frames etc.
(d)
All of
the above
18. Electron beam welding can be carried out in
(a) Open air
(b) A shielded gas environment
(c)
Vacuum
(d) A pressurized inert gas chamber
19. The oxy-acetylene gas is used in gas welding
produce a flame temperature of
(a) 1800 o C
(b) 2100 o C
(c) 2400 o C
(d)
3200 o C
20. For gas welding , the pressure desired at the
welding torch for acetylene is
(a)
7 to
103 KN/m2
(b) 70 to 280 KN/m2
(c) 280 to 560 KN/m2
(d) 560 to 840 KN/m2
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