# Practice Test: Question Set - 32

1. In a four bar chain or quadric cycle chain
(A) Each of the four pairs is a turning pair
(B) One is a turning pair and three are sliding pairs
(C) Two are turning pairs and two are sliding pairs
(D) Three are turning pairs and one is a sliding pair

2. In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is
(A) 12
(B) 16
(C) 25
(D) 32

3. According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a
(A) Straight line
(B) Parabolic curve
(C) Triangle
(D) Rectangle

4. Which gear is used for connecting two coplanar and intersecting shafts?
(A) Spur gear
(B) Helical gear
(C) Bevel gear
(D) None of the above

5. In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
(A) Critical damping ratio
(B) Damping factor
(C) Logarithmic decrement
(D) Magnification factor

6. In a single slider crank chain
(A) Each of the four pairs is a turning pair
(B) One is a turning pair and three are sliding pairs
(C) Two are turning pairs and two are sliding pairs
(D) Three are turning pairs and one is a sliding pair

7. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
(A) 2
(B) 3
(C) 4
(D) 5

8. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
(A) 0° and 90°
(B) 0° and 180°
(C) 90° and 180°
(D) 180° and 360°

9. In order to balance the reciprocating masses,
(A) Primary forces and couples must be balanced
(B) Secondary forces and couples must be balanced
(C) Both (A) and (b)
(D) None of these

10. The primary unbalanced force is maximum _________ in one revolution of the crank.
(A) Twice
(B) Four times
(C) Eight times
(D) Sixteen times

11. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
(A) (1/2) μ W R
(B) (2/3) μ W R
(C) (3/4) μ W R
(D) μ W R

12. The maximum fluctuation of speed is the
(A) Difference of minimum fluctuation of speed and the mean speed
(B) Difference of the maximum and minimum speeds
(C) Sum of maximum and minimum speeds
(D) Variations of speed above and below the mean resisting torque line

13. The relative velocity of B with respect to A in a rigid link AB is
(A) Parallel to AB
(B) Perpendicular to AB
(C) Along AB
(D) At 45° to AB

14. The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
(A) n = 3(l - 1) - 2j - h
(B) n = 2(l - 1) - 2j - h
(C) n = 3(l - 1) - 3j - h
(D) n = 2(l - 1) - 3j - h

15. The method of direct and reverse cranks is used in engines for
(A) The control of speed fluctuations
(B) Balancing of forces and couples
(C) Kinematic analysis
(D) Vibration analysis

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