480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.To connect two parallel and coplanar shafts the following type of gearing is used
- ASpur gear
- BBevel gear
- CSpiral gear
- DNone of the above
2.A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
- Aωv
- B2ωv
- Cω²v
- D2ωv²
3.The train value of a gear train is
- AEqual to velocity ratio of a gear train
- BReciprocal of velocity ratio of a gear train
- CAlways greater than unity
- DAlways less than unity
4.When the sleeve of a Porter governor moves upwards, the governor speed
- AIncreases
- BDecreases
- CRemain unaffected
- DFirst increases and then decreases
5.When the sleeve of a Porter governor moves downwards, the governor speed
- AIncreases
- BDecreases
- CRemain unaffected
- DFirst increases and then decreases
6.In a radial cam, the follower moves
- AIn a direction perpendicular to the cam axis
- BIn a direction parallel to the cam axis
- CIn any direction irrespective of the cam axis
- DAlong the cam axis
7.The instantaneous centers which vary with the configuration of mechanism are called
- APermanent instantaneous centers
- BFixed instantaneous centers
- CNeither fixed nor permanent instantaneous centers
- DNone of the above
8.Hammer blow
- AIs the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
- BIs the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
- CVaries as the square root of the speed
- DVaries inversely with the square of the speed
9.The Coriolis component of acceleration exists whenever a point moves along a path that has
- ALinear displacement
- BRotational motion
- CGravitational acceleration
- DTangential acceleration
10.In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
- AEqual to
- BLess than
- CGreater than
- DNone of these
11.The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
- A(1/2). μ W cosecα (r₁ + r₂)
- B(2/3). μ W cosecα (r₁ + r₂)
- C(1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
- D(2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
12.The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is
- A1
- B2
- C3
- D4
13.In automobiles the power is transmitted from gear box to differential through
- ABevel gear
- BUniversal joint
- CHooke's joint
- DKnuckle joint
14.When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
- Aω² r {(n + 1)/n}
- Bω² r {(n - 1)/n}
- Cω² r {n/(n + 1)}
- Dω² r {n/(n - 1)}
15.When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
- AMinimum
- BZero
- CMaximum
- DNone of these
16.When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be
- Aω²r. (n + 1)/n
- Bω²r. (n - 1)/n
- Cω²r. n/(n + 1)
- Dω²r. n/(n - 1)
17.The velocity of a body moving with simple harmonic motion is __________ at the mean position.
- AZero
- BMinimum
- CMaximum
- DNone of these
18.The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
- AZero
- BMinimum
- CMaximum
- DNone of these
19.In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by
- Aω sinθ/(n² - sin²θ)1/2
- Bω cosθ/(n² - cos²θ)1/2
- Cω sinθ/(n² - cos²θ)1/2
- Dω cosθ/(n² - sin²θ)1/2
20.The steering of a ship means
- AMovement of a complete ship up and down in vertical plane about transverse axis
- BTurning of a complete ship in a curve towards right or left, while it moves forward
- CRolling of a complete ship sideways
- DNone of the above