vacuum hardening
martempering
induction hardening
flame hardening
✅ The correct answer is option D.
Mechanical Engineering MCQs
The ratio of the inertia force to the elastic force is called
Reynold’s number
Froude’s number
Weber’s number
Mach number
✅ The correct answer is option D.
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
both the balls undergo an equal change in momentum
the change in momentum suffered by rubber ball is more than the lead ball
the change in momentum suffered by rubber ball is less than the lead ball
none of the above
✅ The correct answer is option B.
An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied.
TRUE
FALSE
✅ The correct answer is option B.
When slack of an activity is positive
it represents a situation where extra resources are available and the completion of project is not delayed
it represents that a programme falls behind schedule and additional resources are required to complete the project in time
the activity is critical and any delay in its performance will delay the completion of whole project
any one of the above
✅ The correct answer is option A.
A leaf spring in automobiles is used
to apply forces
to measure forces
to absorb shocks
to store strain energy
✅ The correct answer is option C.
The length of Lancashire boiler varies from
5 to 6 m
6 to 7 m
7.25 to 9 m
9 to 10 m
✅ The correct answer is option C.
The Klein’s method of construction for reciprocating engine mechanism
is a simplified version of instantaneous centre method
utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine
enables determination of coriolis component
is based on the accele
✅ The correct answer is option B.
A higher compression ratio causes
pre-ignition
increase in detonation
an acceleration in the rate of combustion
any one of these
✅ The correct answer is option D.