# Practice Test: Question Set - 17

**1. Efficiency of a screw jack is given by**

- (A)

*tan (Î± + Ï†)/tanÎ±*

- (B)

*tanÎ±/tan (Î± +Ï†)*

- (C)

*tan (Î± - Ï†)/tanÎ±*

- (D)

*tanÎ±/tan (Î± - Ï†)*

**2. The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where Î´ = Static deflection of a simply supported shaft due to the point load)**

- (A) 0.4985/√Î´

- (B) 0.5615/√Î´

- (C) 0.571/√Î´

- (D) 0.6253/√Î´

**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)

*2Ï€. √[gh/(k*

_{G}² + h²)]- (B)

*2Ï€. √[(k*

_{G}² + h²)/gh]- (C)

*(1/2Ï€). √[gh/(k*

_{G}² + h²)]- (D)

*(1/2Ï€). √[(k*

_{G}² + h²)/gh]**6. A simple spring-mass vibrating system has a natural frequency of**

*f*. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become_{n}- (A)

*f*/2

_{n}- (B) 2

*f*

_{n}- (C) 4

*f*

_{n}- (D) 8

*f*

_{n}**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 Ï‰ rad/s. The coriolis component of acceleration is- (A)

*Ï‰v*

- (B) 2

*Ï‰v*

- (C)

*Ï‰²v*

- (D) 2

*Ï‰v²*

**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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