⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs61
The usual composition of a soldering alloy is__________________?
Atin, lead and small percentage of antimony
Btin and lead
Ctin, lead and silver
Dtin and copper E. tin, copper and lead
62
The crystal structure of brass is_________________?
AF.
BB.
CP.
DOrthorhombic crystalline structure E. none of the above
63
A specimen of aluminium metal when observed under microscope shows __________________?
AB.
BF.
CP. structure
Da complex cubic structure E. orthorhombic crystalline structure
64
Brass contains___________________?
A70% copper and 30% zinc
B90% copper and 10% tin
C85-92% copper and rest tin with little lead and nickel
D70-75% copper and rest tin E. 70% copper and 30% tin
65
Steel made from phosphatic iron is_________________?
Abrittle
Bhard
Cductile
Dtough E. malleable
66
Preheating is essential in welding ___________________?
Acast iron
Bhigh speed steel
Call non-ferrous materials
Dall of the above E. none of the above
67
Balls for ball bearings are made of_________________?
Acast iron
Bmild steel
Cstainless steel
Dcarbon-chrome steel E. high carbon steel
68
Which is the false statement about wrought iron. It has________________?
Ahigh resistance to rusting and corrosion
Bhigh ductility
Cability of hold protective coating
Deasily weldable characteristics E. uniform strength in all directions
69
Free cutting steels_____________________?
Aare used where ease in machining is the criterion
Bcontain carbon in free form
Crequire least cutting force
Ddo not exist E. can be cut freely even under adverse conditions
70
Permalloy is a___________________?
Akind of stainless steel
Bnone ferrous alloy
Cpolymer
Dcutting tool material E. nickel and iron alloy having high permeability