D:-galvanized iron
Correct Answer:- Option-D
Question39:-___ flame is used to weld most of the common metals, in oxyacetylene gas welding.
A:-neutral flame
B:-oxidising flame
C:-carburising flame
D:-none of the above
Correct Answer:- Option-A
Question40:-Which metals have highest melting point ?
A:-heigh speed steel
B:-diamond
C:-wrought iron
D:-tungsten
Correct Answer:- Option-D
Question41:-Lathe bed is made of
A:-mild steel
B:-cast iron
C:-wrought iron
D:-high carbon steel
Correct Answer:- Option-B
Question42:-Cutting tool material following qualities
A:-cold hardness
B:-red hardness
:-toughness
D:-all of the above
Correct Answer:- Option-D
Question43:-A fit which may sometimes provide clearance, sometimes
A:-clearance fit
B:-transition fit
iterference
D:-fit
Correct Answer:- Option-B
Question44:- is a precision instrument for checking and setting of angles.
A:-vernier caliper
-bevel protractor
-sine bar
D:-vernier bevel protractor
Correct Answer:- Option-C
Question45:- is a precision finishing operation carried out using fine abrasive materials.
A:-honing
-surface finishing
C:-reaming
D:-lapping
Correct Answer:- Option-D
Question46:-___ when added to steel improve corrosion resistance, toughness and hardness of steel.
A:-chromium
-nickel
:-Manganese
D:-silicon
Correct Answer:- Option-A
Question47:-A special device which holds, supports, locates and also guide the cutting tool during operation is called

C:-four jaw chuck
D:-pin voice
Correct Answer:- Option-B
Question48:-Riveting is a method of making ___joints.
A:-semi permanent
B:-permanent