Theory of Machine Objective Questions with Answers - Set 04

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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Theory of Machines:
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