Practice Test: Question Set - 11
1. The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)
- (A) (1/2).
μ W (r₁ + r₂)
- (B) (2/3).
μ W (r₁ + r₂)
- (C) (1/2).
μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
- (D) (2/3).
μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
2. In a flat collar pivot bearing, the moment due to friction is proportional to
- (A) (r₁²
- r₂²)/(r₁ - r₂)
- (B) (r₁²
- r₂²)/(r₁ + r₂)
- (C) (r₁³
- r₂³)/(r₁² - r₂²)
- (D) (r₁³
- r₂³)/(r₁ - r₂)
3. The cam and follower is an example of
- (A) Sliding
pair
- (B) Rolling pair
- (C) Lower pair
- (D) Higher pair
4. When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than
- (A) 0.25
- (B) 0.5
- (C) 1
- (D) 2
5. Angle of dwell of cam is defined as the angle
- (A) During which the follower
returns to its initial position
- (B) Of rotation of the cam for definite
displacement of the follower
- (C) Through which the cam rotates
during the period in which the follower remains in the highest position
- (D) Moved by the cam from the
instant the follower begins to rise, till it reaches its highest position
6. Rectilinear motion of piston is converted into rotary by
- (A) Cross head
- (B) Slider crank
- (C) Connecting rod
- (D) Gudgeon pin
7. In an ideal machine, the output as compared to input is
- (A) Less
- (B) More
- (C) Equal
- (D) May
be less or more depending on efficiency
8. In a mechanism, the fixed instantaneous centers are those centers which
- (A) Remain
in the same place for all configurations of the mechanism
- (B) Vary
with the configuration of the mechanism
- (C) Moves
as the mechanism moves, but joints are of permanent nature
- (D) None
of the above
9. At the nodal point in a shaft, the amplitude for torsional vibration will be
- (A) Minimum
- (B) Maximum
- (C) Zero
- (D) Infinity
10. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
- (A) Less
sensitive
- (B) More
sensitive
- (C) Unaffected
of sensitivity
- (D) Isochronous
11. The two elements of a pair are said to form a higher pair, when they
- (A) Have
a surface contact when in motion
- (B) Have
a line or point contact when in motion
- (C) Are
kept in contact by the action of external forces, when in motion
- (D) Permit
relative motion
12. Torsional vibrations are said to occur when the particles of a body moves
- (A) Perpendicular
to its axis
- (B) Parallel to
its axis
- (C) In a circle
about its axis
- (D) None of
these
13. A point on a link connecting double slider crank chain traces a
- (A) Ellipse
- (B) Circle
- (C) Parabola
- (D) Hyperbola
14. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links
- (A) Will
remain same
- (B) Will
change
- (C) Could
change or remain unaltered depending on which link is fixed
- (D) Will not occur
15. Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is
- (A) (l₁
+ l₂ + l₃)/3
- (B) l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
- (C) l = l₁
+ l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
- (D) l₁ +
l₂ + l₃
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