A Best Way To Crack Gorenment Job Exams

Mechanical Engineering Objective Questions { Production Technology }



99. In inter gas arc welding following is used for welding magnesium
A.Non-combustible electrode in combination with helium and d.c. current
B.Combustible electrodes and argon in combination with a.c. current
C.Straight polarity d.c. current
D.Carbon dioxide, because of its excellent penetration and high speed

100. Oxygen to acetylene ratio in case of neutral flame is
A.0.8 : 1
B.1 : 1
C.1.2 : 1
D.2 : 1

101. In inert gas arc welding, following is used for welding aluminium
A.Non-combustible electrode in combination with helium and d.c. current
B.Combustible electrode and argon in combination with a.c. current
C.Straight polarity d.c. current
D.Carbon dioxide, because of its excellent penetration and high seed

102. In metallic arc welding, the transfer of metal from the electrode is due to
A.Molecular attraction
B.Surface tension and attraction
C.Gravitational force
D.Both (A) and (B) above

103. In which of the following welding techniques, the weld pool is surrounded by an inert gas
A.Arc welding
B.Carbon arc
C.MIG
D.Electroslag welding

104. The striking voltage as compared to voltage during welding in arc welding is
A.Same
B.More
C.Less
D.Unpredictable

105. In inert gas arc welding, following is used for welding carbon steel
A.Non-combustible electrode in combination with helium and d.c. current
B.Combustible electrodes and argon in combination with a.c. current
C.Straight polarity d.c. current
D.Carbon dioxide, because of its excellent penetration and high speed

Page 15 of 139

« 13 14  15  1617 »

Subjects