In case of locomotives, the swaying couple is resisted by
A.Dead weight of the engine
B.Fish plates of the tails
C.Inside section of the rails
D.Side pressure between the flanges of the wheels
E.(C) and (D) together
Category: Theory of Machines Mcqs
The secondary critical speed of a shaft occurs at
A.Half the primary critical speed
B.Twice the primary critical speed
C.Four times the primary critical speed
D.Occurs only when there are more than 2 rotors on a shaft
E.If the externam exciting system has a frequency other than the primary critical speed
A beater machine in a pulp mill is driven by a 50 H.P. motor using 6 vee belts of D section. If one of the belt breaks after a month
A.All the belts have to be replaced
B.Broken belt may be replaced by the similar etc
C.Broken belt and at least one adjacent belt should be replaced
D.Broken belt and at least two adjacent belt should be replaced
E.None of the above
Pitch of gears is expressed by
A.Circular pitch
B.Diametral pitch
C.Module
D.Any of the above
E.None of the above
Klien’s construction gives a graphical construction for
A.Velocity polygon
B.Acceleration polygon
C.Four bar chain mechanism
D.Slider crank mechanism
E.Angular accelerations
In case of reciprocating engine mechanism
A.The primary and secondary forces have same direction
B.The primary and secondary forces have same amplitude
C.The ratio of magnitude of primary forces of secondary forces is 2
D.The primary force has twoce the frequency of secondary force
A gear cutter suitable for cutting 42 to 54 teeth will provide correct form
A.For any gear having teeth anywhere between 42 to 54
B.For only 42 teeth gear
C.For only 54 teeth gear
D.For only 48 teeth gear
In case of spur gears the flank of the tooth is
A.The part of the tooth surface lying below the pitch surface
B.The curve forming face and flank
C.The width of the gear tooth measured axially along the pitch surface
D.The surface of the top of the tooth
E.Radius that connects in the root circle to the profile of the tooth
Which dynamometer will be most suitable for measuring the BHP of an automobile engine?
A.Electrical generator type
B.Electrical resistance type
C.None of the above
D.Hydraulic type
Coriolis component of acceleration will exist only if
A.There are two coincidental points
B.Two coincident points have relative angular velocity of sliding
C.Two coincidental points have linear relative velocity of sliding accompanied by the rotation about fixed centres
D.The two coincidental points must have same centre of rotation
E.None of the above
