Practice Test: Question Set - 13
1. The Ackermann steering mechanism is preferred to the Davis type in automobiles because
- (A) The
former is mathematically accurate
- (B) The
former is having turning pair
- (C) The
former is most economical
- (D) The
former is most rigid
2. Higher pairs are those which have
- (A) Point
or line contact between the two elements when in motion
- (B) Surface
contact between the two elements when in motion
- (C) Elements
of pairs not held together mechanically
- (D) Two
elements that permit relative motion
3. The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)
- (A) sinφ + sinα
= b/c
- (B) cosφ - sinα
= c/b
- (C) cotφ - cotα
= c/b
- (D) tanφ + cotα
= b/c
4. When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
- (A) Screw pair
- (B) Spherical
pair
- (C) Turning pair
- (D) Sliding pair
5. In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
- (A) x₁/x₂
- (B) log(x₁/x₂)
- (C) loge(x₁/x₂)
- (D) log(x₁.x₂)
6. Which of the following mechanisms produces mathematically an exact straight line motion?
- (A) Grasshopper
mechanism
- (B) Watt
mechanism
- (C) Peaucellier's
mechanism
- (D) Tchebicheff
mechanism
7. The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line
- (A) Joining
the corresponding points
- (B) Perpendicular
to line as per (A)
- (C) Not possible to determine
with these data
- (D) At 45° to line as per (A)
8. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)
- (A) ω (r₁
r₂) sinθ
- (B) ω (r₁
+ r₂) sinθ sec2θ
- (C) ω (r₁
r₂) cosθ
- (D) ω (r₁
+ r₂) cosθ cosec2θ
9. For the brake to be self locking, the force P at C shown in the below figure, should
- (A) Be
zero
- (B) Act
in upward direction
- (C) Act
in downward direction
- (D) None
of these
10. A governor is said to be stable, if the
- (A) Radius of
rotation of balls increases as the equilibrium speed decreases
- (B) Radius
of rotation of balls decreases as the equilibrium speed decreases
- (C) Radius
of rotation of balls increases as the equilibrium speed increases
- (D) Radius
of rotation of balls decreases as the equilibrium speed increases
11. Which one of the following can completely balance several masses revolving in different planes on a shaft?
- (A) A
single mass in different planes
- (B) Two
masses in any two planes
- (C) A
single mass in one of the planes of the revolving masses
- (D) Two
equal masses in any two planes
12. When one of the links of a kinematic chain is fixed, the chain is known as a
- (A) Structure
- (B) Mechanism
- (C) Inversion
- (D) Machine
13. The frictional torque transmitted by a cone clutch is same as that of
- (A) Flat
pivot bearing
- (B) Flat
collar bearing
- (C) Conical
pivot bearing
- (D) Truncated
conical pivot bearing
14. The sense of Coriolis component is such that it
- (A) Leads
the sliding velocity vector by 90°
- (B) Lags the sliding velocity
vector by 90°
- (C) Is along the sliding velocity
vector
- (D) Leads the sliding velocity
vector by 180°
15. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?
- (A) Theory
of machines
- (B) Applied
mechanics
- (C) Mechanisms
- (D) Kinetics
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