# 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
(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

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