Theory of Machines On-line Practice Tests - Set 17

Practice Test: Question Set - 17

1. Efficiency of a screw jack is given by
    (A) tan (α + φ)/tanα 
    (B) tanα/tan (α +φ)
    (C) tan (α - φ)/tanα
    (D) tanα/tan (α - φ)

2. The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where δ = Static deflection of a simply supported shaft due to the point load)
    (A) 0.4985/√δ
    (B) 0.5615/√δ
    (C) 0.571/√δ
    (D) 0.6253/√δ

3. In order to double the period of a simple pendulum, the length of the string should be
    (A) Halved
    (B) Doubled
    (C) Quadrupled
    (D) None of these

4. In a kinematic chain, a quaternary joint is equivalent to
    (A) One binary joint
    (B) Two binary joints
    (C) Three binary joints
    (D) Four binary joints

5. The frequency of oscillation of a compound pendulum is
    (A) 2π. √[gh/(kG² + h²)]
    (B) 2π. √[(kG² + h²)/gh]
    (C) (1/2π). √[gh/(kG² + h²)]
    (D) (1/2π). √[(kG² + h²)/gh]

6. A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
    (A) fn/2
    (B) 2 fn
    (C) 4 fn
    (D) 8 fn

7. Open 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

8. The frequency of oscillation at compared to earth will be
    (A) 6 times more
    (B) 6 times less
    (C) 2.44 times more
    (D) 2.44 times less

9. The Klein's method of construction for reciprocating engine mechanism
    (A) Is a simplified version of instantaneous centre method
    (B) Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine
    (C) Enables determination of Coriolis component
    (D) Is based on the acceleration diagram

10. A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
    (A) ωv
    (B) 2ωv
    (C) ω²v
    (D) 2ωv²

11. The secondary unbalanced force is __________ the primary unbalanced force.
    (A) One-half
    (B) Two-third
    (C) n times
    (D) 1/n times

12. Cam angle is defined as the angle
    (A) During which the follower returns to its initial position
    (B) Of rotation of the cam for a 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

13. Elements of pairs held together mechanically is known as
    (A) Closed pair
    (B) Open pair
    (C) Mechanical pair
    (D) Rolling pair

14. Creep in belt drive is due to
    (A) Material of the pulley
    (B) Material of the belt
    (C) Larger size of the driver pulley
    (D) Uneven extensions and contractions due to varying tension

15. For high speed engines, the cam follower should move with
    (A) Uniform velocity
    (B) Simple harmonic motion
    (C) Uniform acceleration and retardation
    (D) Cycloidal motion

Show and hide multiple DIV using JavaScript View All Answers

Theory of Machines:
  Set 01      Set 02      Set 03      Set 04      Set 05      Set 06      Set 07      Set 08      Set 09
  Set 10      Set 11      Set 12      Set 13      Set 14      Set 15      Set 16      Set 17      Set 18
  Set 19      Set 20      Set 21      Set 22      Set 23      Set 24      Set 25      Set 26      Set 27
  Set 28      Set 29      Set 30      Set 31      Set 32      Set 33      Set 34      Set 35      Set 36
  Set 37      Set 38
Share on Google Plus

    FB Comments


Post a Comment