Theory of Machines MCQ Practice Test - Set 37 - ObjectiveBooks

# Practice Test: Question Set - 37

1. The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is
(A) Equal to 1
(B) Less than 2
(C) Equal to 2
(D) Greater than 2

2. In a pantograph, all the pairs are
(A) Turning pairs
(B) Sliding pairs
(C) Spherical pairs
(D) Self-closed pairs

3. The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)
(A) ω² × OQ
(B) ω² × OQ sinθ
(C) ω² × OQ cosθ
(D) ω² × OQ tanθ

4. The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
(A) ω². (r₁ r₂). (1 - cos² θ)
(B) ω². (r₁ + r₂). (1 + cos² θ)
(C) ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
(D) ω². (r₁ - r₂). (1 - sin² θ)

5. In a steam engine, the link constitutes a
(A) Piston, piston rod and cross-head
(B) Connecting rod with big and small end brasses, caps and bolts
(C) Crank pin, crankshaft and flywheel
(D) All of the above

6. When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
(A) Minimum
(B) Zero
(C) Maximum
(D) None of these

7. The swaying couple is due to the
(A) Primary unbalanced force
(B) Secondary unbalanced force
(C) Two cylinders of locomotive
(D) Partial balancing

8. The relation between number of links (l) and number of joints (j) in a kinematic chain is
(A) l = (1/2).(j + 2)
(B) l = (2/3).(j + 2)
(C) l = (3/4).(j + 3)
(D) l = j + 4

9. The contact ratio for gears is
(A) Zero
(B) Less than one
(C) Greater than one
(D) Infinity

10. The gear train usually employed in clocks is a
(A) Simple gear train
(B) Reverted gear train
(C) Sun and planet gear
(D) Differential gear

11. A Porter governor is a
(A) Pendulum type governor
(D) Inertia governor

12. The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)
(A) (1/2) μ W R cosecα
(B) (2/3) μ W R cosecα
(C) (3/4) μ W R cosecα
(D) μ W R cosecα

13. An automobile steering gear is an example of
(A) Sliding pair
(B) Rolling pair
(C) Lower pair
(D) Higher pair

14. When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
(A) Lower pair
(B) Higher pair
(C) Self-closed pair
(D) Force-closed pair

15. The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
(A) More than
(B) Less than
(C) Same as
(D) None of these

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