# Practice Test: Question Set - 23

1. In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
(A) Depends upon
(B) Is independent of
(C) Either A or B
(D) None of these

2. There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
(A) 1/24
(B) 1/8
(C) 4/15
(D) 12

3. In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to
(A) Minimize the effect of primary forces
(B) Minimize the effect of secondary forces
(C) Have perfect balancing
(D) To start the locomotive quickly

4. Power of a governor is the
(A) Mean force exerted at the sleeve for a given percentage change of speed
(B) Work-done at the sleeve for maximum equilibrium speed
(C) Mean force exerted at the sleeve for maximum equilibrium speed
(D) None of the above

5. The C.G. of a link in any mechanism would experience
(A) No acceleration
(B) Linear acceleration
(C) Angular acceleration
(D) Both angular and linear accelerations

6. Instantaneous center of rotation of a link in a four bar mechanism lies on
(A) Right side pivot of this link
(B) Left side pivot of this link
(D) Can’t occur

7. In a simple harmonic motion, the velocity vector with respect to displacement vector
(A) Is in phase
(D) Lags by 90°

8. In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines
(A) The algebraic sum of the primary forces must be equal to zero
(B) The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
(C) Both (A) and (B)
(D) None of these

9. If Ï‰/Ï‰n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
(A) 0°
(B) 90°
(C) 180°
(D) 360°

10. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
(A) Static friction
(B) Dynamic friction
(C) Limiting friction
(D) Coefficient of friction

11. The component of the acceleration, parallel to the velocity of the particle, at the given instant is called
(B) Tangential component
(C) Coriolis component
(D) None of these

12. Frequency of vibrations is usually expressed in
(A) Number of cycles per hour
(B) Number of cycles per minute
(C) Number of cycles per second
(D) None of these

13. The train value of a gear train is
(A) Equal to velocity ratio of a gear train
(B) Reciprocal of velocity ratio of a gear train
(C) Always greater than unity
(D) Always less than unity

14. When the primary direct crank of a reciprocating engine makes an angle of 'Î¸' with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.
(A) Î¸/2
(B) Î¸
(C) 2Î¸
(D) 4Î¸

15. The mechanism consisting of three turning pairs and one sliding pair, is called a
(A) Single slider crank chain
(B) Whitworth quick return motion mechanism
(C) Crank and slotted lever quick return motion mechanism
(D) All of the above

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