61. Two pulleys of radii r1 and r2 and at distance x apart are connected by means of an open belt drive. The length of the belt is
✅ The correct answer is option B.
Theory of machines MCQs
62. The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
the Ackerman steering gear consists of turning pairs
the Ackerman steering gear is most economical
both (a) and (b)
✅ The correct answer is option D.
63. In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver.
Yes
No
✅ The correct answer is option A.
64. The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
45° in the direction of rotation of the link containing the path
45° in the direction opposite to the rotation of the link containing the path
90° in the direction of rotation of the link containing the path
180° in the direction
✅ The correct answer is option C.
65. When the sleeve of a Porter governor moves downwards, the governor speed
increases
decreases
remains unaffected
first increases and th
✅ The correct answer is option B.
66. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)
P = W tan α
P = W tan (α + φ)
P = W (sin α + μ cos α)
P = W (cos α + μ sin α
✅ The correct answer is option C.
67. Which of the following is a turning pair?
Piston and cylinder of a reciprocating steam engine
Shaft with collars at both ends fitted into a circular hole
Lead screw of a lathe with nut
Ball and a socket join
✅ The correct answer is option B.
68. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
cause withdrawing or throttling of steam
reduce length of effective stroke of piston
reduce maximum opening of port to steam
all of these
✅ The correct answer is option B.
69. A body is said to be under forced vibrations, when
there is a reduction in amplitude after every cycle of vibration
no external force acts on a body, after giving it an initial displacement
a body vibrates under the influence of external force
none of the above
✅ The correct answer is option A.
70. Which of the following is an example of a higher pair ?
Toothed gearing
Belt and rope drive
Ball and roller bearing
all of these
✅ The correct answer is option D.