Dynamics of Machines Mock Test

1. Which of the following is incorrect regarding inertia force?

2. D-Alemberts principle is used for which of the following?

3. The net force acting on the crosshead pin is known as

4. In a horizontal engine, reciprocating parts are accelerated when the piston moves from

5. For high speed engines, the cam follower should move with

6. 2 D ALEMBERT'S PRINCIPLE - DYNAMIC ANALYSIS IN RECIPROCATING ENGINES

7. In a radial cam, the follower moves

8. For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

9. The size of a cam depends upon

10. Centre of masses of the system lies on the axis of rotation.

11. Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ?

12. The angle between the direction of the follower motion and a normal to the pitch curve is called

13. In a horizontal engine, reciprocating parts are retarded when the piston moves from

14. Why the inertia torque acts in the opposite direction to the accelerating couple?

15. Crank effort is the product of crank pin radius and

16. For a multicylinder engine, the coefficient of fluctuation of speed would vary with

17. The cam follower extensively used in air- craft engines is

18. A circle drawn with centre as the cam centre and radius equal to the distance between the cam centre and the point on the pitch curve at which the pressure angle is maximum, is called

19. In a punching press, which of the following quantity is constant?

20. A body remains in equilibrium if

21. 2 m and the cylinder bore is 0.5 m. engine runs at 250 r.p.m & 30° from T.D.C. Find the piston effort.

22. A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.

23. A radial follower is one

24. For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is

25. The maximum shear force required for punching depends on

26. The balance energy required for punching is supplied by the flywheel by

27. In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by

28. 01mm.

29. Determine the frequency of transverse vibrations of the shaft.

30. In latitude 25.0 S, SA (spin axis) of a FG (free gyro) is in position S40E and horizontal. Find the tilt after 6 hours.

31. Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.

32. Determine the static deflection of the shaft in mm.

33. Which of the following is a pendulum type governor?

34. 5 m. Find the natural frequency of torsional vibrations.

35. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

36. The axis of precession is to the plane in which the axis of spin is going to rotate.

37. When the sleeve of a Porter governor moves downwards, the governor speed

38. 5 and the mean speed is 20 rpm, find the maximum speed.

39. The height of a Watts governor is

40. The steering of a ship means

41. A Watts governor can work satisfactorily at speeds from

42. 5 and the mean speed is 20 rpm, find the minimum speed.

43. When the sleeve of a porter governor moves upwards, the governor speed

44. 3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft.

45. A Hartnell governor is a

46. 1m then find the other balancing mass situated at a distance of 0.2m.

47. 2m and r=0.3m, l=1m, find l2.

48. 2m, 0.15m, 0.25m and 0.3m. Angles between consecutive masses = 45, 75 and 135 degrees.

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