McqMate
1. |
The advantages of involute profile over cycloidal are given below. Identify if there is any incorrect statement |
A. | In the involute system, the pressure angle is constant, from commencement to end of engagement |
B. | The vriation in the centre distance with in limits does not affect the two mating gears in the involute system |
C. | The straight teeth of the basic rank for the involute profile admits of simple tools |
D. | The interference is inherently absent in this system |
E. | The profile for the flank and face is a single curve in the involute system |
Answer» D. The interference is inherently absent in this system |
2. |
A reverted gear train is one is which |
A. | The direction of rotation of first and last gear is the same |
B. | The firection of rotation of first and the last gear is opposite |
C. | The first and last gear are on the same shaft |
D. | The first and last gear are essentially on separate but parallel shafts |
E. | None of the above |
Answer» C. The first and last gear are on the same shaft |
3. |
Slip in turning belt is |
A. | Always restricted to 1 percent |
B. | Less than 5% |
C. | Zero |
D. | Depends on the belt material |
E. | Maximum permissible |
Answer» C. Zero |
4. |
The effect of creep in case of cross-belt drive is |
A. | To increase the power transmitted |
B. | To increase the speed of driven pulley |
C. | (A) and (B) above together |
D. | To reduce the speed of the driven pulley and consequently reduce the power output |
E. | None of the above |
Answer» D. To reduce the speed of the driven pulley and consequently reduce the power output |
5. |
A cylindrical type cam is one |
A. | With circular type motion of follower |
B. | With cylindrical shape of follower |
C. | With disc type cam in which the position of the follower is determined by the radial distance from the cam axis. |
D. | With cricumferential contour cut in the surface of the cylinder which rotates about its axis |
E. | With cylindrical roller follower |
Answer» D. With cricumferential contour cut in the surface of the cylinder which rotates about its axis |
6. |
A pulley in a belt-drive acts as a |
A. | sliding pair |
B. | Cylindrical pair |
C. | wrapping pair |
D. | rolling pair |
E. | Bevel grars |
Answer» C. wrapping pair |
7. |
In case of cross-helical worm the axes of two shafts are |
A. | Non-intersecting |
B. | Parallel |
C. | Non-parallel-non intersecting |
D. | Intersecting |
E. | Non-parallel |
Answer» C. Non-parallel-non intersecting |
8. |
Ackermann steering gear consists of |
A. | Turning pair |
B. | Rolling and sliding pairs |
C. | Sliding pairs |
D. | Rolling pairs |
E. | Sliding and rotary pairs |
Answer» A. Turning pair |
9. |
Identify the incorrect statement if any |
A. | In case of free vibrations the external force is applied at the ends only |
B. | Damping is resistance to the oscillartion |
C. | When the frequency of the external exciting force coincides with the natural frequency of the system, state of resonance is reached |
D. | Forced vibrations are independent of natural frequency of vibration |
E. | None of the above |
Answer» A. In case of free vibrations the external force is applied at the ends only |
10. |
V-belts with E type cross-section are generally used in |
A. | Automobiles |
B. | Small engines |
C. | When driver and driven units are far off |
D. | Heavy duty machines |
E. | None of the above |
Answer» D. Heavy duty machines |
11. |
In a cam and follower mechanism, for the uniform velocity of the followers the displacement curve will have |
A. | No slope |
B. | Constant slope |
C. | Slope in positive direction only |
D. | Slope in both positive and negative direction |
E. | None of the above |
Answer» B. Constant slope |
12. |
Pitch of gears is expressed by |
A. | Circular pitch |
B. | Diametral pitch |
C. | Module |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
13. |
Coriolis component is encountered in |
A. | Slider crank mechanism |
B. | Four bar chain mechanism |
C. | Quich return mechanism |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» C. Quich return mechanism |
14. |
The mass moment of inertia is |
A. | The resistance to angular acceleration |
B. | The mass of every element of a body multiplied by its distance from the axis |
C. | Any of the above |
D. | None of the above |
E. | Cross-head |
Answer» A. The resistance to angular acceleration |
15. |
The number of forks provided in a Hooke's joint is |
A. | Three |
B. | Six |
C. | Two |
D. | One |
E. | Four |
Answer» C. Two |
16. |
Which of the following gears is free from axial thrust |
A. | Worm gears |
B. | Bevel grars |
C. | Herringbone gears |
D. | Helical gears |
E. | Spiral gears |
Answer» C. Herringbone gears |
17. |
In case of hypoid gears the mutual position of shafts will be |
A. | Non-intersecting |
B. | Parallel |
C. | Non-parallel |
D. | Non-parallel, non-intersecting |
E. | Intersecting |
Answer» D. Non-parallel, non-intersecting |
18. |
Coriorli's component of acceleration exists whenever a point moves along a path that has |
A. | Gravitational acceleration |
B. | Rotational motion |
C. | Linear displacement |
D. | Tangential acceleration |
E. | Centripetal acceleration |
Answer» B. Rotational motion |
19. |
The spring constant k of a coil-spring is |
A. | inversely proportional to the square of the number of coils in the spring |
B. | Sperm |
C. | directly proportional to the number of coils in the spring |
D. | inversely proportional to the number of coils in the spring |
E. | directly proportional to the square of the number of coils in the spring |
Answer» E. directly proportional to the square of the number of coils in the spring |
20. |
In case of spur gears the profile is |
A. | Radius that connects the root circle to the profile of the tooth |
B. | The curve forming face and flank |
C. | The part of the tooth surface lying below the pitch surface |
D. | The surface of the top of tooth |
E. | The width of the gear tooth measured axially along the pitch surface |
Answer» B. The curve forming face and flank |
21. |
Dynamic of machines deals with |
A. | The relative motion between the parts, neglecting the consideration of forces |
B. | The forces acting on the parts of the machine |
C. | The apparatus for applying mechanical power |
D. | The number of inter-related parts, each having a definite motion |
E. | None of the above |
Answer» B. The forces acting on the parts of the machine |
22. |
Klein's construction can be used when |
A. | Crank has a uniform angular velocity |
B. | Crank has a uniform angular acceleration |
C. | Crank has a non-uniform angular velocity |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» E. (A) and (C) above |
23. |
In the elliptical trammel mechanism, the mid-point of the link connecting the two sliders traverses |
A. | an elliptical path |
B. | a parobolic path |
C. | a circular path |
D. | none of the above |
E. | None of the above |
Answer» C. a circular path |
24. |
A dadial follower is |
A. | One that reciprocates in the guides |
B. | One that oscillates |
C. | One in which the follower translates along an axis passing through the cam centre of rotation |
D. | One in which the axis of the following movement is displaced from the cam centre |
E. | None of the above |
Answer» C. One in which the follower translates along an axis passing through the cam centre of rotation |
25. |
The pulley in a belt drive acts as |
A. | Sliding pair |
B. | Cylindrical pair |
C. | Turning pair |
D. | Rolling pair |
E. | Spherical pair |
Answer» D. Rolling pair |
26. |
A shaft having one end fixed has a disc oscillating freely at the other end. If the shaft stiffness, increases the natural frequency of vibrations will |
A. | Increase |
B. | Decrease |
C. | There will be no effect |
D. | Will depend on the stiffness of the disc |
E. | None of the above |
Answer» A. Increase |
27. |
If a machine uses four V belts, while purchasing care should be taken to ensure that |
A. | All belts are same section |
B. | All above |
C. | All belts are of same batch number |
D. | All belts are of same size |
E. | All belts are of same manufacturers |
Answer» B. All above |
28. |
In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when |
A. | Half of the reciprocating masses are balanced by rotating masses |
B. | 1/2 of the reciprocating mass are balanced by equivalent rotating mass |
C. | More than half of the reciprocating masses are balanced by rotating masses |
D. | Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses |
E. | None of the above |
Answer» A. Half of the reciprocating masses are balanced by rotating masses |
29. |
Which of the following is a higher pair? |
A. | A shaft revolving in a bearing |
B. | Piston reciprocating inside the cylinder |
C. | Automobile steering gear |
D. | Ball and socket |
E. | None of the above |
Answer» E. None of the above |
30. |
The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as |
A. | Bearing vibrations |
B. | Over damped vibrations |
C. | Torsional vibrations |
D. | Non-linear vibrations |
E. | Under damped vibrations |
Answer» A. Bearing vibrations |
31. |
If a particle of a link has a velocity when changes both in magnitude and direction at any instant, then |
A. | It must have three components of acceleration e.g. centripetal, centrifugal and gravitational |
B. | It must have two components of acceleration e.g. centripetal, and tangential |
C. | It must have three components of acceleration e.g. centripetal centrifugal and tangential |
D. | It must have four components of acceleration e.g. centripetal, centrifugal gravitational and tangential |
E. | It must have only unidirectional acceleration |
Answer» B. It must have two components of acceleration e.g. centripetal, and tangential |
32. |
Which of the following oil has highest specific gravity? |
A. | Turpentine |
B. | Diesel |
C. | Castor oil |
D. | Petrol |
E. | Sperm |
Answer» C. Castor oil |
33. |
In case of involute gears |
A. | Interference is inherently absent |
B. | A convex flank is always in contact with concave flank |
C. | Variation in centre distance of shafts increases radial force |
D. | Pressure angle is constant throughout the teeth engagement |
E. | None of the above |
Answer» D. Pressure angle is constant throughout the teeth engagement |
34. |
The rotor of a ship rotates in anticlock wise direction when viewed from the bow end and the ship takes a left turn. The effect of gyroscopic couple on the ship is |
A. | to lower the bow and raise the stern |
B. | to raise the bow and lower then stern |
C. | to roll the ship slightly clockwise when viewed fro bow end |
D. | None of the above |
E. | None of the above |
Answer» B. to raise the bow and lower then stern |
35. |
In case of gears, the module is |
A. | The length of the pitch circule diameter per tooth |
B. | The number of teeth per unit length on pitch circle diameter |
C. | The pistance measured along the pitch circle from a point on one tooth to a corresponding point on the adjacent point |
D. | Any of the above |
E. | None of the above |
Answer» A. The length of the pitch circule diameter per tooth |
36. |
Hammer blow in locomotives results in |
A. | Variable horizontal force |
B. | Tendency to lift wheel from rails |
C. | Uniform torque |
D. | Pulsating torque |
E. | Uneven speed |
Answer» B. Tendency to lift wheel from rails |
37. |
In Iocomotive operation, the swaying couple results due to |
A. | Primary disturbing force |
B. | Use of double acting cylinders |
C. | Hammer blow |
D. | Use of two cylinders |
E. | High speeds |
Answer» A. Primary disturbing force |
38. |
Which of the following is a centrifugal type governor? |
A. | Watt governor |
B. | Hartnell governor |
C. | Porter governor |
D. | All of the above |
E. | None of the above |
Answer» B. Hartnell governor |
39. |
The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be |
A. | 47.50% |
B. | 60% |
C. | 25% |
D. | 33% |
E. | 50% |
Answer» D. 33% |
40. |
A governor is said to be stable when |
A. | There is one radius of the governor weights for each equilibrium speed |
B. | There is minimum change of the radius of the governor weights at a operating speed |
C. | The position of balls does not change within the operating speed |
D. | The position of balls changes within permissible limits within the working range of a governor |
E. | None of the above |
Answer» A. There is one radius of the governor weights for each equilibrium speed |
41. |
Klien's construction gives graphical construction for |
A. | Both of above |
B. | Acceleration polygon |
C. | Slider-crank mechanism |
D. | Velocity polygon |
E. | Four bar chain mechanism |
Answer» A. Both of above |
42. |
Can simple band brake be made self-energising type |
A. | No |
B. | Yes, but with require several modifications |
C. | Will not be economical |
D. | Yes |
E. | Yes, but with few limitations |
Answer» A. No |
43. |
For speed reduction in the ratio of 100 the type of gear preferred is |
A. | Spur gear |
B. | Worm and worm wheel |
C. | Bevel gear |
D. | Hypoid gear |
E. | Helical gear |
Answer» B. Worm and worm wheel |
44. |
The moment of friction with the assumption of uniform wear to uniform pressure is |
A. | Same |
B. | Greater |
C. | Lower |
D. | (A) and (B) above |
E. | (A) and (C) above |
Answer» C. Lower |
45. |
The type of governor used in record players for adjusting the speed of turn table generally is |
A. | Porter governor |
B. | Proell governor |
C. | Hartung governor |
D. | Simple Watt's governor |
E. | Pickering governor |
Answer» E. Pickering governor |
46. |
A belt drive is |
A. | A positive drive |
B. | Not a positive drive |
C. | Meant for small torque transmission only |
D. | Used only when the two pulleys have parallel axis |
E. | None of the above |
Answer» B. Not a positive drive |
47. |
The engine of an aeroplane rotates in a clockwise direction when seen from the tail end and the aeroplane takes a turn torwards left. The effect of gyroscopic couple on aeroplane is |
A. | to raise the nose and dip the tail |
B. | to dip the nose and raise the tail |
C. | to roll the aeroplane slightly in the clockwise direction when viewed from tail end |
D. | None of the above |
E. | None of the above |
Answer» A. to raise the nose and dip the tail |
48. |
A V belt designated as C 3048/120 will have |
A. | Approximately 120 inch inside length |
B. | Approximately 120 cm inside length |
C. | C section, length unspecified |
D. | Width 120 mm |
E. | None of the above |
Answer» A. Approximately 120 inch inside length |
49. |
A cycle chain is a kinematic chain |
A. | Yes |
B. | No |
C. | Yes, provided the links are limited in number |
D. | Yes provided the distance is limited |
E. | None of the above |
Answer» B. No |
50. |
A kinematic chain must have at least |
A. | Four links and two turning pairs |
B. | Four links and four turning pairs |
C. | Four links and five turning pairs |
D. | Two links and two turning pairs |
E. | Three links and two turning pairs |
Answer» B. Four links and four turning pairs |
51. |
In order to balance the reciprocating masses, the conditions to be satisfied are |
A. | Primary forces must balance |
B. | All above conditions must be satisfied |
C. | Secondary couples must balance |
D. | Primary couples must balance |
E. | Secondary forces must balance |
Answer» B. All above conditions must be satisfied |
52. |
A cam profile is the |
A. | Actual working contour of the cam |
B. | Profile of path traced by a cam follower |
C. | Total surface area of the cam |
D. | Path which the cam follower traces |
E. | The profile of the path to be traced by the mechanism driven by follower |
Answer» A. Actual working contour of the cam |
53. |
The number of instantaneous centres for a four bar chain mechanism would be |
A. | 4 |
B. | 6 |
C. | 5 |
D. | 3 |
E. | 2 |
Answer» B. 6 |
54. |
Which dynamometer will be most suitable for measuring the BHP of an automobile engine? |
A. | Electrical generator type |
B. | Rope brake type |
C. | Prony brake |
D. | Electrical resistance type |
E. | Hydraulic |
Answer» E. Hydraulic |
55. |
In case of locomotives, the effect of hammer blow is counteracted by |
A. | Flanges of the tyres of the wheels |
B. | Balancing weights |
C. | Inside section of the rails |
D. | Dead weight of the engine |
E. | All of the above |
Answer» D. Dead weight of the engine |
56. |
A 0.5 kg weight attached to a light spring elogates it 7.87 mm. The natural frequency of the system would be in the range |
A. | 100-175 cpm |
B. | 300-350 cpm |
C. | 175-290 cpm |
D. | 25-50 cpm |
E. | 50-100 cpm |
Answer» B. 300-350 cpm |
57. |
The secondary critical speed of a shaft occurs at |
A. | Twice the primary critical speed |
B. | Occurs only when there are more than 2 rotors on a shaft |
C. | Four times the primary critical speed |
D. | If the externam exciting system has a frequency other than the primary critical speed |
E. | Half the primary critical speed |
Answer» A. Twice the primary critical speed |
58. |
Which of the following instruments may be used in vibration measurements? |
A. | Photometer |
B. | Accelerometer |
C. | Dynamometer |
D. | Balometer |
E. | None of the above |
Answer» B. Accelerometer |
59. |
In locomotives the unbalanced part of the primary disturbing force due to reciprocating masses, cause |
A. | Variation of tractive effect |
B. | Periodical vibrations |
C. | Lifting of locomotive |
D. | Oscillation in vertical planes |
E. | Hammer blow |
Answer» A. Variation of tractive effect |
60. |
The 'crowning' of flat pulleys is generally done pulley |
A. | To reduce belt friction |
B. | To prevent belt joining from damaging the belt surface |
C. | To prevent the belt from running off the pulley |
D. | In case of cross belt drives only |
E. | None of the above |
Answer» C. To prevent the belt from running off the pulley |
61. |
V belt having cross-section A is suitable for usual load of 5 HP. If 15 HP load is to be transmitted |
A. | Toothed belts may be used |
B. | 3 Vee belts using 3 groove pulley may be used |
C. | Machine arrangement may be modified |
D. | Drive system may be changed |
E. | Gear system may be adopted |
Answer» B. 3 Vee belts using 3 groove pulley may be used |
62. |
The efficiency in case of worm gear drives is generally in the range |
A. | 70-85 percent |
B. | 50-70 percent |
C. | 10-25 percent |
D. | 25-40 percent |
E. | 40 - 60 percent |
Answer» A. 70-85 percent |
63. |
Two shafts have their axes not in the same straight line. Also their axes are not parallel but intersecting. Which of the following coupling can be used for these shafts? |
A. | Flexible coupling |
B. | Universal coupling |
C. | Oldham's coupling |
D. | Rigid coupling |
E. | Any of the above |
Answer» B. Universal coupling |
64. |
Coriolis component is not involved in |
A. | Andreau variable stroke engine mechanism |
B. | Slider crank mechanism |
C. | Line sliding in a swivelling pin |
D. | Quick return mechanism |
E. | Tangent cam acceleration |
Answer» B. Slider crank mechanism |
65. |
Idler pulley is used for |
A. | Maintaining belt tension |
B. | Changing direction of rotation |
C. | For stopping motion frequently |
D. | For running during idling periods only |
E. | None of the above |
Answer» A. Maintaining belt tension |
66. |
Contact ratio of gear should be |
A. | One |
B. | More than one |
C. | Less than one |
D. | Not defined |
E. | None of the above |
Answer» D. Not defined |
67. |
The number of nodes in a shaft carrying three rotors will be |
A. | Three |
B. | Zero |
C. | Four |
D. | Two |
E. | One |
Answer» D. Two |
68. |
By using large thread angles in a lifting machine |
A. | The mechanical advantage will be low |
B. | The mechanical advantage will be high |
C. | The load will be sustained in absence of effort |
D. | The load will be easily lifted |
E. | While unloading, little effort will be required |
Answer» A. The mechanical advantage will be low |
69. |
The throw of a cam is the maximum distance of the follower from |
A. | Starting to finish |
B. | Inner most circle |
C. | Root circle |
D. | Pitch circle |
E. | Base circle |
Answer» E. Base circle |
70. |
The number of degrees of feeedom for a vibrating beam will be |
A. | Nil |
B. | Four |
C. | Two |
D. | Five |
E. | One |
Answer» C. Two |
71. |
Which of the following is a lower pair? |
A. | Piston and cylinder |
B. | Cam and follower |
C. | Belt drive |
D. | Gear |
E. | None of the above |
Answer» A. Piston and cylinder |
72. |
Which of the following is a dead weight governor? |
A. | Porter governer |
B. | Hartness governer |
C. | Watt governor |
D. | None of the above |
E. | None of the above |
Answer» A. Porter governer |
73. |
The mechanism used in a petrol engine is |
A. | Crank mechanism |
B. | Slider mechanism |
C. | Slider crank mechanism |
D. | Natural line and circular mechanism |
E. | None of the above |
Answer» C. Slider crank mechanism |
74. |
In the Crossby engine indicator which one of the following mechanism is used? |
A. | Slider-crank mechanism |
B. | Scotch yoke mechanism |
C. | Scotch yoke mechanism |
D. | Modified pantograph mechanism |
E. | None of the above |
Answer» C. Scotch yoke mechanism |
75. |
Timing belt |
A. | Have no slip |
B. | Have maximum slip during starting |
C. | Slip in proportion to the time of operation |
D. | Are used to determine the life time of a belt |
E. | None of the above |
Answer» A. Have no slip |
76. |
The speed ratio in case of micro gears is |
A. | Between 1.1 and 5 |
B. | More than 10 |
C. | Less than 1 |
D. | Between 5 and 10 |
E. | 1 |
Answer» E. 1 |
77. |
For a rational number for the pitch circle diameter and a rational number of teeth on the wheel, the circular pitch will work out to |
A. | An odd number |
B. | An even number |
C. | A rational number |
D. | An irrational number |
E. | None of the above |
Answer» D. An irrational number |
78. |
A swinging field type dynamometer is |
A. | Torsion dynamometer |
B. | Vortex type dynamometer |
C. | Friction dynamometer |
D. | Electrical dynamometer |
E. | Transmission type of dynamometer |
Answer» D. Electrical dynamometer |
79. |
Forced vibrations |
A. | Are followed by free vibrations |
B. | Are preceded by free vibrations |
C. | Take place at a frequency more than natural frequency |
D. | Are independent of natural frequency |
E. | None of the above |
Answer» D. Are independent of natural frequency |
80. |
A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is inelastic the velocity of of two masses after impact will be |
A. | 8.33 m/s |
B. | 4.17 m/s |
C. | Zero |
D. | 13.3 m/s |
E. | 6.67 m/s |
Answer» A. 8.33 m/s |
81. |
The critical speed of a shaft is affected by |
A. | Diameter of the disc |
B. | Eccentricity |
C. | Span of shaft |
D. | (A) and (B) above |
E. | (A), (B) and (C) above |
Answer» E. (A), (B) and (C) above |
82. |
A standard gear cutter No. 3 is marked to cut 35-54 teeth. It implies that |
A. | The cutter is to be replaced after cutting 54 teeth |
B. | The cutter will be suitable for gears having 35 to 54 teeth |
C. | The cutter will be suitable for spur gear teeth cutting only |
D. | The cutter will provide correct profile for any gear having number of teeth in the range 35 to 54 |
E. | None of the above |
Answer» B. The cutter will be suitable for gears having 35 to 54 teeth |
83. |
A kinematic chain requires minimum of |
A. | 3 links and 3 turning pairs |
B. | 4 links and 4 turning pairs |
C. | 3 links and 4 turning pairs |
D. | 2 links and 3 turning pairs |
E. | 4 links and 5 turning pairs |
Answer» B. 4 links and 4 turning pairs |
84. |
Which type of governor is preferred for gramophones? |
A. | Harting |
B. | Porter |
C. | Hartnell |
D. | Pickering |
E. | Watt |
Answer» D. Pickering |
85. |
An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to |
A. | Unbalanced parts of fan |
B. | Aerodynamic unbalance |
C. | Primary critical speed effect |
D. | Secondary critical speed effect |
E. | Vibration in air |
Answer» B. Aerodynamic unbalance |
86. |
In a kinematic chain the minimum number of kinematic pairs required is |
A. | Five |
B. | Three |
C. | Four |
D. | Two |
E. | One |
Answer» C. Four |
87. |
Which of the following is a spring controlled governor? |
A. | Harting governor |
B. | Pickering governor |
C. | Hartnell governor |
D. | Wilson hartnell governor |
E. | All of the above |
Answer» E. All of the above |
88. |
The sum of the tensions when the belt is running on the pulley is |
A. | Less than the initial tension |
B. | More than the initial tension |
C. | More than twise the initial tension |
D. | Half the initial tension |
E. | None of the above |
Answer» C. More than twise the initial tension |
89. |
Klien's construction gives a graphical construction for |
A. | Velocity polygon |
B. | Slider crank mechanism |
C. | Angular accelerations |
D. | Acceleration polygon |
E. | Four bar chain mechanism |
Answer» D. Acceleration polygon |
90. |
In order that a belt may not run off the pulley |
A. | It should be properly tightened |
B. | The centre line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of that pulley |
C. | The belt should be provided with frictional material |
D. | The belt should be provided with a guide |
E. | None of the above |
Answer» B. The centre line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of that pulley |
91. |
The gears are considered to be operating in medium velocity range if their peripheral velocity lies in the range |
A. | 25-50 m/sec |
B. | 3-15 m/sec |
C. | 15-25 m/sec |
D. | 1-3 m/sec |
E. | 50-75 m/sec |
Answer» B. 3-15 m/sec |
92. |
Motor cycle shock sbsorbers are generally designed for |
A. | Resonant damping |
B. | Light damping |
C. | Large damping |
D. | Critical damping |
E. | Partial damping |
Answer» D. Critical damping |
93. |
A point on a link connecting double slider crank chain, traces a |
A. | Circular path |
B. | Hoperbolic path |
C. | Straight line path |
D. | Parabolic path |
E. | Elliptical path |
Answer» E. Elliptical path |
94. |
Velocity of sliding between two mating gear surfaces can be defined as |
A. | Sum of their angular velocities x distance between pitch point and point of contact. |
B. | Sum of their angular velocities x distance between their centres of rotation. |
C. | Sum of their angular velocities x difference between their pitch circle diameters |
D. | None of these |
E. | None of the above |
Answer» A. Sum of their angular velocities x distance between pitch point and point of contact. |
95. |
Identify incorrect statement regarding the flywheel, if any |
A. | It is provided to minimise vibration of engine |
B. | It takes care of output fluctuations and controls input accordingly |
C. | It is provided to control engine speed |
D. | All above |
E. | In help in starting engine |
Answer» D. All above |
96. |
The number of natural frequencies for three rotor system will be |
A. | Six |
B. | Three |
C. | One |
D. | Four |
E. | Two |
Answer» E. Two |
97. |
In case of gears, the interference takes place |
A. | Whenever the forms of the mating teeth are such that contact between them can occur at some place other than along the correct path of contact |
B. | When gears do not move smoothly in absence of lubrication |
C. | When the pitch of the gears is not same |
D. | When the gear teeth are under cut |
E. | None of the above |
Answer» A. Whenever the forms of the mating teeth are such that contact between them can occur at some place other than along the correct path of contact |
98. |
In case of solid friction, when tan ? = |
A. | The body A will move over the surface B irrespective of the magnitude of the force F applied on the body |
B. | tan ? can be equal to |
C. | tan ? can never be equal to |
D. | No motion of body A on surface B is possible, irrespective of how large the magnitude of force F applied on the body may be |
E. | tan ? can be equal to |
Answer» A. The body A will move over the surface B irrespective of the magnitude of the force F applied on the body |
99. |
Which of the following is a dead weight type governor? |
A. | Porter governor |
B. | Hartnell governor |
C. | Watt governor |
D. | All of the above |
E. | None of the above |
Answer» A. Porter governor |
100. |
Which of the following is not a positive drive? |
A. | Rope drive |
B. | Flat belt drive |
C. | V-belt drive |
D. | All of the above |
E. | None of the above |
Answer» E. None of the above |
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