Practice Test: Question Set - 04
1. Which of the following mechanism is an approximate straight line motion mechanism?
- (A) Watt's
mechanism
- (B) Grasshopper
mechanism
- (C) Robert's
mechanism
- (D) All of these
2. The size of cam depends upon
- (A) Base circle
- (B) Pitch circle
- (C) Prime circle
- (D) Pitch curve
3. If some links are connected such that motion between them can take place in more than one direction, it is called
- (A) Incompletely constrained
motion
- (B) Partially
constrained motion
- (C) Completely
constrained motion
- (D) Successfully
constrained motion
4. The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at
- (A) The center of the disc
- (B) The point of contact
- (C) An infinite distance on the plane surface
- (D) The point on the circumference situated vertically
opposite to the contact point
5. The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
- (A) m.ω².r
cosθ
- (B) c.m.ω².r
sinθ
- (C) (1 - c).m.ω².r
(cosθ - sinθ)
- (D) m.ω².r
(cosθ - sinθ)
6. The instantaneous centers which vary with the configuration of mechanism are called
- (A) Permanent
instantaneous centers
- (B) Fixed
instantaneous centers
- (C) Neither
fixed nor permanent instantaneous centers
- (D) None
of the above
7. The Klein's method of construction for reciprocating engine mechanism
- (A) Is
based on acceleration diagram
- (B) Is
a simplified form of instantaneous center method
- (C) Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine
- (D) Enables
determination of Cariole’s component
8. The working depth of a gear is the radial distance from the
- (A) Pitch
circle to the bottom of a tooth
- (B) Pitch
circle to the top of a tooth
- (C) Top
of a tooth to the bottom of a tooth
- (D) Addendum
circle to the clearance circle
9. The unbalanced primary forces in a reciprocating engine are
- (A) Balanced
completely
- (B) Balanced
partially
- (C) Balanced
by secondary forces
- (D) Not
balanced
10. In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)
- (A) Less than
unity
- (B) Equal to
unity
- (C) Greater
than unity
- (D) Zero
11. Crowning on pulleys helps
- (A) In
increasing velocity ratio
- (B) In
decreasing the slip of the belt
- (C) For
automatic adjustment of belt position so that belt runs centrally
- (D) Increase
belt and pulley life
12. The example of successfully constrained motion is a
- (A) Motion of an
I.C. engine valve
- (B) Motion
of the shaft between a footstep bearing
- (C) Piston
reciprocating inside an engine cylinder
- (D) All of the
above
13. The lower pairs are _________ pairs.
- (A) Self-closed
- (B) Force-closed
- (C) Friction
closed
- (D) None of
these
14. In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)
- (A) (r₁ +
r₂) (y/x)
- (B) (r₁ +
r₂) (x/y)
- (C) (r₁ -
r₂) (y/x)
- (D) (r₁ -
r₂) (x/y)
15. For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a
- (A) 30° V-engine
- (B) 60° V-engine
- (C) 120°
V-engine
- (D) 150° V-engine
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