Q.31 Which of the following atmospheric action is to be occurs during welding process?
A. oxidizing action
B. Nitriding action
C. Both A and B
D. carbon mono oxide is evolved
Ans.: C
Q.32 What is full form of “LASER”?
A. light amplification stimulated emission radiation
B. light amplification simulation emission rays
C. local amplification of stimulated emission rays
D. light amplification stimulated emission rays
Ans.: A
Q.33 LASER welding is used in the welding of ____
A. chromium, aluminum
B. aluminum, nickel tantalum
C. titanium zirconium
D. All of the above
Ans.: D
Q.34 Which of the following is/are features of laser welding?
A. micro miniature welding
B. low energy requirement
C. no vacuum necessary
D. used as spot and seam welding
E. all of the above
Ans.: E
Q.35 Followings are limitation of laser welding?
A. high cost
B. difficulty in controlling the characteristic of the laser beam
C. low efficiency of the ruby rod
D. all of the above
Ans.: D
Q.36 In ultrasonic welding, ultrasonic vibrations generated by___
A. magneto-strictive effect
B. Piezo-electric effect
C. Both A and B
D. crystallization
Ans.: C
Q.37 Ultrasonic welding is employed for welding of ___
A. dissimilar metals
B. similar metals
C. non metals
D. any of the above
Ans.: D
Q.38 What are the advantages of ultrasonic welding?
A. absence of grain growth and grain boundary depletion
B. absence of cast nugget and fusion
C. absence of recrystallization and inter-metallic compounds
D. all of the above
Ans.: D
Q.39 In welding of electronic printed circuits, boding of plastics and bimetals which of the following method is used?
A. Laser welding
B. ultrasonic welding
C. gas welding
D. electron beam welding
Ans.: B
Q.40 A seam welding is__
A. used for overlapping metal sheet
B. electrodes are in the form of roller shape
C. Both A and B
D. used for projection welding and round shape electrodes are used
Ans.: C
Q.41 A projection welding is ___
A. electrodes are made flat and hollow
B. projections are created on work piece before welding
C. modified form of spot welding
D. all of the above
Ans.: D
Q.42 what are the applications of projection welding?
A. get strong joint for two different thickness sheets
B. join metal sheet like container of oil
C. more suitable for punching, forming, and stamping surface joint
D. all of the above
Ans.: D
Q.43 Electrodes used for metal arc welding are___
A. may be consumable or non consumable
B. filler material in the form of a wire of rod
C. Both A and B
D. water cool electrodes
Ans.: C
Q.44 consumable electrodes are made up of ___
A. different material as that of the job to be welded
B. same material as that of the job to be welded
C. water cooled electrodes
D. all of the above
Ans.: B
Q.45 which of the followings are non consumable electrodes?
A. tungsten electrodes
B. graphite electrodes
C. carbon electrodes
D. all of the above
Ans.: D