Maximum hardness that can be achieved in plain carbon steel is of the order of
A.50 Rockwell ‘C’
B.66 – 67 Rockwell ‘C’
C.100 – 150 Rockwell ‘C’
D.80-85 Rockwell ‘C’
E.There is no such limit for hardness
Category: Mechanical Engineering Mcqs
A petrol engine fuel that knocks at a low speed
A.has a high octane rating
B.may not knock at high speed
C.will always knock at high speed
D.will have low fire point
A petrol engine as compared to diesel engine (both running at full load) is
A.More efficient
B.Less efficient
C.Equally efficient
D.Depend on other factors
E.None of the above
The number of degrees of freedom in case of diatomic gases is
A.2
B.3
C.4
D.5
E.6
High air-fuel ratio in gas turbines
A.Reduces the exhaust temperature
B.Improves thermal efficiency
C.Increases power output
D.Restricts damage to turbine blades
E.None of the above
The overall purpose of training, development is to
A.Increase organizational effectiveness
B.Increase profits
C.Prenant works obsolesence
D.Increase managrical effectiveness
E.None of the above
Which type of pump is preferred for pumping lubricating oil in automobile
A.Reciprocating type
B.Open impeller type
C.Centrifugal pump with impeller shrouded on one side only
D.Centrifugal pump with impeller shrouded on both sides
E.Gear pump
Thermodynamic processes are those
A.Where a difference is observed in any macroscopic property of the system between different times or state
B.Where a difference is observed in any microscopic property of the system between different times or state
C.Which occurs in the direction of an intensive property or driving force contained within the system
D.Which require an agency outside the system to force the process
E.None of the above
The cycle of life, death and decay involving organic nitrogeneous matter is called
A.The sulphur cycle
B.The nitrogen cycle
C.The carbon cycle
D.The hydrological cycle
E.None of the above
A mould which has good erosion resistance to metal flow and is also collapsible is
A.green sand mould
B.skin dry sand mould
C.dry sand mould
D.none of the above
