Correct : A. transmitted force is greater than applied force
2. Isolation factor is twice the transmissibility ratio.
Correct : B. false
3. The height of a Watt’s governor is
Correct : D. inversely proportional to (speed)
4. A Watt’s governor can work satisfactorily at speeds from
Correct : A. 60 to 80 r.p.m
5. The ratio of height of Porter governor to the height of Watt’s governor is
Correct : C. m + m/m
6. When the sleeve of a porter governor moves upwards, the governor speed
Correct : A. increases
7. When the sleeve of a Porter governor moves downwards, the governor speed
Correct : B. decreases
8. In a Porter governor, the balls are attached to the extension of lower links.
Correct : A. true
9. A Hartnell governor is a
Correct : C. spring loaded governor
10. A Watt’s governor is a spring loaded governor.
Correct : B. false
11. Which of the following is a pendulum type governor?
Correct : A. watt’s governor
12. The axis of precession is to the plane in which the axis of spin is going to rotate.
Correct : B. perpendicular
13. A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be
Correct : D. iωωp
14. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
Correct : C. to raise the nose and dip of the tail
15. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail.
Correct : A. true
16. The steering of a ship means
Correct : B. turning of a complete ship in a curve towards right or left, while it moves forward
17. The rolling of a complete ship side-ways is known as pitching of a ship.
Correct : B. false
18. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.
Correct : A. true
19. The pitching of a ship is assumed to take place with simple harmonic motion.
Correct : A. true
20. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
Correct : A. to move the ship towards star-board
21. It is required to lift water at the top of a high building at the rate of 50 litres/min. Assuming the losses due to friction equivalent to 5 m and those due to leakage equal to 5 m head of water, efficiency of pump 90%, decide the kilowatt capacity of motor required to drive the pump.
Correct : C. 0.302 kw
22. Power is transmitted by an electric motor to a machine by using a belt drive. The tensions on the tight and slack side of the belt are 2200 N and 1000 N respectively and diameter of the pulley is 600 mm. If speed of the motor is 1500 r.p.m, find the power transmitted.
Correct : B. 56.548 kw
23. The flywheel of an engine has a mass of 200 kg and radius of gyration equal to 1 m. The average torque on the flywheel is 1200 Nm. Find the angular acceleration of flywheel and the angular speed after 10 seconds starting from rest.
Correct : D. 6 rad/s
24. 6 x 10 = 6 rad/s.
Correct : A. 2.055 m
25. Calculate the work done per minute by a punch tool making 20 working strokes per min when a 30 mm diametre hole is punched in 5 mm thick plate with ultimate shear strength og 450 Mpa in each stroke.
Correct : A. 10.69 knm
26. 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.
Correct : A. 61.16 up
27. The steering of a ship means
Correct : B. turning of a complete ship in a curve towards right r left, while it moves forward
28. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
Correct : A. to move the ship towards starboard
29. 24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m
Correct : B. 1.42 m
30. 24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m ; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m
Correct : C. 59.5
31. 24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m
Correct : B. 17.824
32. 24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m ; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m
Correct : B. 19064 n
33. 66.
Correct : B. 3/2 c) 3/4
34. The starting torque of the steam engine is 1500 N-m and may be assumed constant, using this data find the angular acceleration of the flywheel in rad/s2.
Correct : B. 0.6
35. 1m then find the other balancing mass situated at a distance of 0.2m.
Correct : D. 10
36. 1m. One of the balancing mass is 30 Kg with RoR of 10cm.
Correct : B. 35
37. 2m and r=0.3m, l=1m, find l2.
Correct : A. 0.26m
38. 2m and r=0.3m, l=1m, find l2.
Correct : D. 0.13m
39. 3m, l=1m, find l2 = 0.5m, find r1 in m.
Correct : B. 0.75
40. 2m, 0.15m, 0.25m and 0.3m. Angles between consecutive masses = 45, 75 and 135 degrees.
Correct : A. 116
41. 2m, 0.15m, 0.25m and 0.3m. Angles between consecutive masses = 45, 75 and 135 degrees.
Correct : A. 201.48
42. The system is automatically statically balanced.
Correct : D. 1, 3 and 4 only
43. 6m c = 2/3
Correct : A. 6978
44. 6m c = 2/3
Correct : A. 13956
45. 6m c = 2/3
Correct : A. -6978
46. 5 kg and the crank radius is 7.5 cm. The length of the connecting rod is 0.3 m. If the engine is rotating at the speed is 500 r.p.m. What is the value of maximum resultant secondary force in Newtons?
Correct : B. 836
47. 5 cm. The length of the connecting rod is 0.3 m. If the engine is rotating at the speed is 500 r.p.m. What is the value of maximum resultant secondary force in Newtons?
Correct : B. 1672
48. 5 kg and the crank radius is 7.5 cm. The length of the connecting rod is 0.3 m. If the engine is rotating at the speed is 500 r.p.m. What is the value of maximum resultant secondary force in kN?
Correct : B. 2.508
49. 6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural frequency (fn), respectively, are
Correct : A. 0.471 and 1.19 hz
50. 1 mm.
Correct : D. 0.6
51. Calculate the natural longitudinal frequency in Hz.
Correct : A. 575
52. 01mm.
Correct : B. 49.85
53. Determine the frequency of transverse vibrations of the shaft.
Correct : D. 41
54. Determine the static deflection of the shaft in mm.
Correct : A. 0.147
55. 665×10-3m, calculate the critical speed of the shaft in rps. Centre of disc at 0.25m away from centre of axis of shaft.
Correct : D. 12.2
56. 5 m. Find the natural frequency of torsional vibrations.
Correct : A. 5.32
57. 6m, l2=0.5m, l3=0.4m
Correct : A. 8.95
58. 85m, kb = 0.55m C = 80 GN/m2
Correct : A. 3.37
59. 095m, d2=0.06m, d3=0.05m Ma = 900 Kg, Mb = 700 Kg
Correct : A. 0.855m
60. 05, 0.06, 0.07.
Correct : D. 0.08
61. 5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a single node system in Hz if the mass moment of inertia of rotors in Kg- m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
Correct : A. 171
62. 5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a two node system in Hz if the mass moment of inertia of rotors in Kg- m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
Correct : D. 277
63. Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.
Correct : A. 4.7
64. 5 and the mean speed is 20 rpm, find the maximum speed.
Correct : B. 25 rpm
65. 5 and the mean speed is 20 rpm, find the minimum speed.
Correct : A. 15 rpm
66. 3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft.
Correct : A. 10.046 kn-m
67. 6 m. It rotates at 1800 r.p.m. clockwise, when looking from the stern. Determine the gyroscopic couple, if the ship travels at 100 km/hr and steer to the left in a curve of 75 m radius.