⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs31
Grey cast iron_____________________?
Acontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
Bis also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
Cis produced by annealing process. I is soft, tough and easily machinec metal
Dis produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material E. none of the above is true
32
Nickel in steel___________________?
Aimproves wear resistance, cutting ability and toughness
Brefines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
Cimproves cutting ability and reduces hardenability
Dgives ductility, toughness, tensile strength and anticorrosion properties E. none of the above
33
The presence of sulphur in pig iron makes__________________?
Ait easily machinable
Bit brittle
Cit hard
Dthe casting unsound E. increases the fluidity
34
Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
A3- 5
B5-7
C7-10
D10-15 E. 15-22
35
Cupola produces following material__________________?
Acast iron
Bpig iron
Cwrought iron
Dmalleable iron E. white iron
36
The following element can’t impart high strength at elevated temperature__________________?
Amanganese
Bmagnesium
Cnickel
Dsilicon E. none of the above
37
White cast iron__________________?
Acontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
Bis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Cis produced by annealing process. It is soft, tough and easily machined metal
Dis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material E. none of the above
38
Connecting rod is usually made of_________________?
Aaluminium
Blow carbon steel
Cmedium carbon steel
Dhigh carbon steel E. cast iron
39
Tungsten in high speed steel provides________________?
Ahot hardness
Btoughness
Cwear resistance
Dsharp cutting edge E. cold hardness
40
Sulphur in steel________________?
Aacts as deoxidiser
Breduces the grain size
Cdecreases tensile strength and hardness
Dlowers the toughness and transverse ductility E. increases hardness