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
- (B) Dead weight
governor
- (C) Spring
loaded 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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