480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.The cam and follower is an example of
- ASliding pair
- BRolling pair
- CLower pair
- DHigher pair
2.The motion of a shaft in a circular hole is an example of
- ACompletely constrained motion
- BIncompletely constrained motion
- CSuccessfully constrained motion
- DNone of these
3.Which of the following is an open pair?
- ABall and socket joint
- BJournal bearing
- CLead screw and nut
- DCam and follower
4.In a kinematic chain, a quaternary joint is equivalent to
- AOne binary joint
- BTwo binary joints
- CThree binary joints
- DFour binary joints
5.The direction of Coriolis component of acceleration is the direction
- AOf relative velocity vector for the two coincident points rotated by 90? in the direction of the angular velocity of the rotation of the link
- BAlong the centripetal acceleration
- CAlong tangential acceleration
- DAlong perpendicular to angular velocity
6.A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
- Aa is +ve and b = 0
- Ba = 0 and b is +ve
- Ca is +ve and b is ?ve
- Da is +ve and b is also +ve
7.A chain comprises of 5 links having 5 joints. Is it kinematic chain?
- AYes
- BNo
- CIt is a marginal case
- DData are insufficient to determine it
8.The example of lower pair is
- AShaft revolving in a bearing
- BStraight line motion mechanisms
- CAutomobile steering gear
- DAll of the above
9.Which of the following is an example of sliding pair?
- APiston and cylinder of a reciprocating steam engine
- BShaft with collars at both ends fitted into a circular hole
- CLead screw of a lathe with nut
- DBall and a socket joint
10.The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
- ATransverse vibrations
- BTorsional vibrations
- CLongitudinal vibrations
- DAll of these
11.The equation of motion for a single degree of freedom system with viscous damping is 4(dx?/dt?) + 9(dx/dt) + 16x. The damping ratio of the system is
- A9/8
- B9/82
- C9/16
- D9/128
12.Crowning on pulleys helps
- AIn increasing velocity ratio
- BIn decreasing the slip of the belt
- CFor automatic adjustment of belt position so that belt runs centrally
- DIncrease belt and pulley life
13.If two moving elements have surface contact in motion, such pair is known as
- ASliding pair
- BRolling pair
- CSurface pair
- DLower pair
14.The sensitiveness of the governor __________ as the speed range decreases.
- ARemains unaffected
- BDecreases
- CIncreases
- DNone of these
15.For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
- AMaximum and zero
- BZero and maximum
- CMinimum and maximum
- DZero and minimum
16.The unbalanced force due to revolving masses
- AVaries in magnitude but constant in direction
- BVaries in direction but constant in magnitude
- CVaries in magnitude and direction both
- DConstant in magnitude and direction both
17.The relative velocity of B with respect to A in a rigid link AB is
- AParallel to AB
- BPerpendicular to AB
- CAlong AB
- DAt 45? to AB
18.A shaft carrying three rotors will have
- ANo node
- BOne node
- CTwo nodes
- DThree nodes
19.In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.
- ARemains constant
- BDecreases
- CIncreases
- DNone of these
20.In order to double the period of a simple pendulum, the length of the string should be
- AHalved
- BDoubled
- CQuadrupled
- DNone of these