When the two elements of a pair are kept in contact with the help of a spring, the pair is known as
A.A lower pair
B.a higher pair
C.a closed pair
D.an unclosed pair
Category: Theory of Machines Mcqs
In the gear box of an automobile, which gear train is used?
A.Simple gear train
B.Compound gear train
C.Epicyclic gear train
D.None of the above
A swinging pendulum in its mid-position possesses
A.only the potential energy
B.only the kinetic energy
C.more kinetic energy and less potential energy
D.None of the above
A reverted gear train is one is which
A.The direction of rotation of first and last gear is the same
B.The firection of rotation of first and the last gear is opposite
C.The first and last gear are on the same shaft
D.The first and last gear are essentially on separate but parallel shafts
E.None of the above
The difference between a machine and a structure is
A.The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work
B.The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
C.The relative motion exists between the parts of a structures whereas it does not exist in machines
D.Structures are temporary constructions whereas machines are paramanent
E.None of the above
A kinematic chain becomes a mechanism when
A.First link is fixed
B.Any one link is fixed
C.All link are fixed
D.None of the links are fixed
E.There is no such criterion
For a rational number for the pitch circle diameter and a rational number of teeth on the wheel, the circular pitch will work out to
A.An odd number
B.An even number
C.A rational number
D.An irrational number
E.None of the above
In a slider crank mechanism for l/r ratio of 4 the percentage of stroke converted by piston corresponding to 90? movement of crank from top centre will be
A.0 percent
B.Less than 50%
C.More than 50%
D.100%
E.None of the above
For fluctuating loads, the appropriate bearing would be
A.Bush bearing
B.Ball bearing
C.Ball bearing with sleeve
D.Roller bearing
E.Needle roller bearing
Which one of the following is not applicable to involute profile
A.The shape of the involute profile is dependent only on the dimensions of the base circle
B.The angular velocity ratio when tow involutes are in mesh, is inversely proportional to the size of the base circles
C.No involute has a pressure angle until it is brought in contact with other mating involute
D.Involute is the only tooth form that is not sensitive to centre distance of their base circles
E.The pitch diameters of mating involutes are inversely proportional to their base circle diameters
