Q.01 Joining of two metals by heating is called___
A. heating
B. welding
C. purification of metals
D. all of the above
Ans.: B
Q.02 Branch of welding in which electric current is used to produce the large amount of heat required for joining together of pieces of metal.
A. Electric welding
B. Gas welding
C. heating of metal
D. electroplating
Ans.: A
Q.03 Welding is classified as____
A. thermal welding
B. gas welding
C. electric arc welding
D. all of the above
Ans.: D
Q.04 Electric welding is classified as___
A. Electric arc welding
B. Electric resistance welding
C. Electron beam welding
D. all of the above
Ans.: D
Q.05 What are the advantages of electric welding?
A. Good quality of welding can be obtained
B. It is reliable and accurate, suitable for mass production
C. no specific work place is required, does not produce any pollution
D. all of the above
Ans.: D
Q.06 The process in which heavy current is made to passed through the join to be weld is known as___
A. arc welding
B. resistance welding
C. capacitance welding
D. reactor welding
Ans.: B
Q.07 Which of the following is/are type of resistance welding?
A. Butt welding
B. Flash welding
C. Spot welding
D. Seam welding and projection welding
E. all of the above
Ans.: E
Q.08 Heat produce in resistance welding is given by___
A. IR
B. IR2
C. I2R
D. V2R
Ans.: C
Q.09 An electric arc is truck by_____ two electrodes and then withdrawing them apart.
A. open circuiting
B. short circuiting
C. switching
D. any of the above
Ans.: B
Q.10 Electric arc has ____characteristic.
A. positive resistance
B. zero resistance
C. negative resistance
D. infinite resistance
Ans.: C
Q.11 As the arc current is increases____
A. voltage across it is increases
B. voltage across it remains constant
C. voltage across it is decreases
D. voltage across it becomes infinity
Ans.: C
Q.12 To produce arc or to strike an arc ___
A. requires less voltage than to maintain arc
B. requires more voltage than to maintain arc
C. requires zero voltage
D. none of the above
Ans.: B
Q.13 In decrease in arc length will result in__
A. increase in arc resistance and building up of arc current
B. decreases in arc resistance
C. decreases in arc resistance and building up of arc current
D. increase in arc voltage and building up of arc current
Ans.: C
Q.14 In welding process to heat the work piece to be weld, it is____
A. always connected to negative terminal of DC supply
B. always connected to positive terminal of DC supply
C. always connected to neutral of AC supply
D. any of the above depends on availability of supply
Ans.: B
Q.15 The fusion of two metals takes place at__
A. below melting point
B. below boiling point
C. at zero degree temperature
D. at or above melting point of metals
Ans.: D