McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
In case of higher pairs |
| A. | There is contact only at higher point of the two elements while in motion |
| B. | There is only line or point contact between the two elements while in motion |
| C. | There is only line or point contact between the two elements while in motion |
| D. | There is no contact between the two elements |
| E. | None of the above |
| Answer» B. There is only line or point contact between the two elements while in motion | |
| 152. |
When one of the links of a kinematic chain is fixed it is known as |
| A. | structure |
| B. | mechanism |
| C. | machine |
| D. | None of the above |
| E. | None of the above |
| Answer» B. mechanism | |
| 153. |
Tan ? can be greater than |
| A. | Rough surfaces |
| B. | Polished surfaces |
| C. | Highly rough surfaces |
| D. | Smooth surfaces |
| E. | Tan ? can never be greater than |
| Answer» E. Tan ? can never be greater than | |
| 154. |
For a vibrating body, if ratio ?/?n is very high, then phase angle would tend to approach |
| A. | 0? |
| B. | 90? |
| C. | 180? |
| D. | 270? |
| E. | None of the above |
| Answer» C. 180? | |
| 155. |
Dynamically unbalanced masses in rotating machines cause |
| A. | Noise |
| B. | Friction |
| C. | Wear |
| D. | Vibrations |
| E. | All of the above |
| Answer» D. Vibrations | |
| 156. |
Which of the following are not standard forms for spur-gears? |
| A. | All above |
| B. | 14 |
| C. | 14 |
| D. | 20? full depth involute system |
| E. | 20? stub-tooth involute system |
| Answer» A. All above | |
| 157. |
A stretched string of a guitar when operated is subjected to |
| A. | Free vibrations |
| B. | Forced torsional vibrations |
| C. | Forced transverse vibrations |
| D. | Damped vibrations |
| E. | None of the above |
| Answer» C. Forced transverse vibrations | |
| 158. |
A vibrometer |
| A. | Indicates vibration frequency |
| B. | Only indicates second and above harmonics |
| C. | Indicates vibration amplitude |
| D. | Indicates nature of vibrations |
| E. | Indicates wave from vibrations |
| Answer» C. Indicates vibration amplitude | |
| 159. |
For fluctuating loads, the appropriate bearing would be |
| A. | Roller bearing |
| B. | Ball bearing |
| C. | Bush bearing |
| D. | Ball bearing with sleeve |
| E. | Needle roller bearing |
| Answer» E. Needle roller bearing | |
| 160. |
In case of belt drives, the effect of centrifugal tension is |
| A. | To reduce the driving power |
| B. | To increase the driving power |
| C. | Not appreciable on driving power |
| D. | Dependent on other factors |
| E. | None of the above |
| Answer» A. To reduce the driving power | |
| 161. |
In case of instantaneous centre of rotation |
| A. | Only three rigid links have no linear velocities relative to each other |
| B. | Two rigid links rotate instantaneously relative to each other |
| C. | One rigid link has no linear velocity |
| D. | The two rigid links have no linear velocities relative to each other at the instantaneous centre |
| E. | None of the above |
| Answer» D. The two rigid links have no linear velocities relative to each other at the instantaneous centre | |
| 162. |
The pitch circle of a cam is |
| A. | The smallest circle drawn to the pitch curve from the centre of rotation of curve |
| B. | The smallest circle drawn to the cam profile from the centre of rotation of a radial cam |
| C. | The circle fitting in cam profile |
| D. | The circle with centre as the centre of cam axis and radius such that it passes through the pitch point |
| E. | None of the above |
| Answer» D. The circle with centre as the centre of cam axis and radius such that it passes through the pitch point | |
| 163. |
The standard pressure angle is generally |
| A. | 22 |
| B. | 10? |
| C. | 12 |
| D. | 14 |
| E. | 17 |
| Answer» D. 14 | |
| 164. |
Frequency of oscillation of a compound pendulum having the same distance between point of suspension and the centre of gravity of mass as a simple pendulum will be |
| A. | Less |
| B. | Same |
| C. | More |
| D. | Depends on other parameters |
| E. | None of the above |
| Answer» A. Less | |
| 165. |
Which is the false statement about a governor? |
| A. | Isochronism in govrnors is desirable when approximately one constant speeds is desired to be kept for all loads |
| B. | A very sensitive governor may not be very stable |
| C. | A sensitive governor cannot be isochronous |
| D. | Hunting in a governor may occur due to worn out guides of the sleeve |
| E. | A stable governor has a fixed position of balls for each speed within the working range |
| Answer» C. A sensitive governor cannot be isochronous | |
| 166. |
The angle of obliquity is kept small in order |
| A. | To reduce force of friction |
| B. | To minimise axial load |
| C. | To minimise power loss in gearing |
| D. | To avoid larger throusts |
| E. | None of the above |
| Answer» D. To avoid larger throusts | |
| 167. |
If there are L number of links in a mechanism, then the number of possible inversions would be |
| A. | (L + 2) |
| B. | (L + 3) |
| C. | L/2 |
| D. | L |
| E. | (L + 1) |
| Answer» D. L | |
| 168. |
A mechanism is an assembly of |
| A. | two links |
| B. | three links |
| C. | only four links |
| D. | four or more than four links |
| E. | None of the above |
| Answer» D. four or more than four links | |
| 169. |
A gear box in an automobile utilises |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Epicyclic gear train |
| D. | Compound-epicyclic gear train |
| E. | None of the above |
| Answer» B. Compound gear train | |
| 170. |
In the coupling rod mechanism of a locomotive each of the four pairs is a |
| A. | sliding pair |
| B. | Rolling pair |
| C. | screw pair |
| D. | Turning pair |
| E. | All of the above |
| Answer» D. Turning pair | |
| 171. |
At critical speed |
| A. | The shaforuns smoothly |
| B. | The shaft runs with noise due to vibrations |
| C. | The shaft becomes dynamically unstable with negligible lateral amplitudes |
| D. | The shaft becomes dynamically unstable with large lateral amplitudes |
| E. | None of the above |
| Answer» C. The shaft becomes dynamically unstable with negligible lateral amplitudes | |
| 172. |
When sunk key is to be used the key way is |
| A. | Provided in shaft only |
| B. | 36 Hz |
| C. | Provided both in shaft and hub |
| D. | Keyway is not provided for a sunk key |
| E. | Provided in hub only |
| Answer» C. Provided both in shaft and hub | |
| 173. |
Kinetic friction is |
| A. | That which occurs when there is no motion |
| B. | Less than maximum static friction |
| C. | Is equal to the static friction |
| D. | Is always more than peak static friction |
| E. | That occurs on dry surfaces only |
| Answer» B. Less than maximum static friction | |
| 174. |
Coriolis component of acceleration will exist only if |
| A. | There are two coincidental points |
| B. | Two coincident points have relative angular velocity of sliding |
| C. | Two coincidental points have linear relative velocity of sliding accompanied by the rotation about fixed centres |
| D. | The two coincidental points must have same centre of rotation |
| E. | None of the above |
| Answer» C. Two coincidental points have linear relative velocity of sliding accompanied by the rotation about fixed centres | |
| 175. |
In a car, transmission losses will be minimum in |
| A. | First gear |
| B. | Direct gear |
| C. | Second gear |
| D. | Sperm |
| E. | Third gear |
| Answer» B. Direct gear | |
| 176. |
Cam size depends upon |
| A. | Pitch cricle |
| B. | Cam operating speed |
| C. | Base circle |
| D. | Outer circle |
| E. | Prime circle |
| Answer» C. Base circle | |
| 177. |
In a car transmission losses will be least in which gear? |
| A. | Direct gear |
| B. | Third gear |
| C. | Second gear |
| D. | First gear |
| E. | Sperm |
| Answer» A. Direct gear | |
| 178. |
Klein's construction is used to determine |
| A. | Displacement of various parts |
| B. | Velocity of various parts |
| C. | Acceleration of various parts |
| D. | Angular acceleration of various parts |
| E. | None of the above |
| Answer» C. Acceleration of various parts | |
| 179. |
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 perfectly elastic, the velocity of two masses after impact will be |
| A. | 6.67 m/s |
| B. | Zero |
| C. | 8.33 m/s |
| D. | 3.33 m/s |
| E. | 2 m/s |
| Answer» A. 6.67 m/s | |
| 180. |
Which of the following road offers maximum resistance to automobiles? |
| A. | Loose sand |
| B. | Well rolled gravel |
| C. | Wood paving |
| D. | Macadam |
| E. | Sperm |
| Answer» A. Loose sand | |
| 181. |
The mechanism used to enlarge or reduce moments for reproducing drawings to different scales is known as |
| A. | Durograph |
| B. | Graphometer |
| C. | Pantograph |
| D. | Clinograph |
| E. | Trisquare |
| Answer» C. Pantograph | |
| 182. |
The frictional torque transmitted by a cone clutch is the same as that of |
| A. | flat collar bearing |
| B. | conical pivot bearing |
| C. | truncated conical pivot bearing |
| D. | None of the above |
| E. | None of the above |
| Answer» C. truncated conical pivot bearing | |
| 183. |
Froude's dynamometer is |
| A. | Torsion dynamometer |
| B. | Fan type dynamometer |
| C. | Vortex type hydraulic dynamometer |
| D. | Mechanical friction type dynamometer |
| E. | Transmission type of dynamometer |
| Answer» C. Vortex type hydraulic dynamometer | |
| 184. |
In vibration analysis 'Beat' frequency is |
| A. | The frequency at which vibrations of a system are damped |
| B. | Said to occur when two vibrations of almost equal frequency are present |
| C. | The frequency when a system exceeds the vibrations frequency from the critical value |
| D. | The frequency below which vibrations do not cause appreciable damage to equipment |
| E. | One at which the vibrations of a system act exactly opposite to the other thereby causing damping |
| Answer» B. Said to occur when two vibrations of almost equal frequency are present | |
| 185. |
In case of Scotch Yoke Mechanism the Coriolis component is |
| A. | Involved but generally neglected |
| B. | Not involved |
| C. | Involved if some other conditions are satisfied |
| D. | Sometimes involved |
| E. | Involved |
| Answer» B. Not involved | |
| 186. |
A 0.5 kg weight attached to a light spring elongates it 0.981 mm. The natural frequency of the system would be approximately |
| A. | 26 cps |
| B. | 21 cps |
| C. | 6 cps |
| D. | 16 cps |
| E. | 11 cps |
| Answer» D. 16 cps | |
| 187. |
A vibrating system is said to be stable if |
| A. | The amplitude of vibration decreases with time |
| B. | The amplitude of vibration does not change with time |
| C. | Only transient increases indefinitely with time |
| D. | The total energy in the system does not change with time |
| E. | None of the above |
| Answer» A. The amplitude of vibration decreases with time | |
| 188. |
The cam angle is |
| A. | The angle of rotation of the cam for a definite displacement of the follower |
| B. | Angle subtended by live portion of cam at the cam centre |
| C. | The angle subtended at the cam centre by the portion of cam during which the follower moves |
| D. | The angle subtended by the cam at the cam centre when the follower dwells |
| E. | None of the above |
| Answer» A. The angle of rotation of the cam for a definite displacement of the follower | |
| 189. |
The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be |
| A. | 2 |
| B. | 4 |
| C. | 5 |
| D. | 7.5 |
| E. | None of the above |
| Answer» E. None of the above | |
| 190. |
In a system if the speed reduction of 60 : 1 is desired the convenient way is to use |
| A. | Helical gears |
| B. | Worm and worm wheel |
| C. | Differential system |
| D. | Bevel gears |
| E. | Simple gear train |
| Answer» B. Worm and worm wheel | |
| 191. |
Which of following gear system have minimum axial thrust? |
| A. | Double helical gears |
| B. | Bevel gears |
| C. | Spur gears |
| D. | Helical gears |
| E. | Miter gears |
| Answer» E. Miter gears | |
| 192. |
In Iocomotives, swaying couple is caused due to |
| A. | Unbalanced part of the secondary forces acting at a distance between the line of stroke of the cylinders |
| B. | Vertical unbalanced primary forces acting in the plane of the wheels |
| C. | Vertical unbalanced primary forces acting in the plane of the wheels |
| D. | Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders |
| E. | Horizontal unbalanced primary forces acting in the plane of the wheel |
| Answer» D. Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders | |
| 193. |
A governor is said to be isochronous when |
| A. | The equilibrium ball radii is constant for a given speed |
| B. | For each speed within the working range the ball weights occupy a definite specific position |
| C. | There is only one radius of the governor weights for each equilibrium sped |
| D. | There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range |
| E. | None of the above |
| Answer» D. There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range | |
| 194. |
In a Hartnell governor if the stiffness of spring is increased the governor will |
| A. | Become more sensitive |
| B. | Become less sensitive |
| C. | Remain unaffected as far sensitivity is concerned |
| D. | Start hunting (E) Become isochronous |
| E. | 21 cps |
| Answer» B. Become less sensitive | |
| 195. |
In taper roller bearing the contact angle is |
| A. | Between 12? and 15? |
| B. | Between 15? and 20? |
| C. | Between 1? and 3? |
| D. | Between 5? and 10? |
| E. | Zero |
| Answer» D. Between 5? and 10? | |
| 196. |
Which of the following is a sliding pair? |
| A. | Bolt and nut |
| B. | Ball and socket joint |
| C. | Belt and pulley |
| D. | Cross-head and guides |
| E. | None of the above |
| Answer» D. Cross-head and guides | |
| 197. |
A body having an initial velocity of 10 m/s moves 200 mm in 5 sec when a force of 20 kgf is applied to it. If the acceleration due to gravity is 9 m/s2 the weight of the body should be |
| A. | 15 kg |
| B. | 18.35 kg |
| C. | 11 kg |
| D. | 18.65 kg |
| E. | 16.5 kg |
| Answer» A. 15 kg | |
| 198. |
Which of the following is not a common section of V-belts |
| A. | B |
| B. | F |
| C. | C |
| D. | D |
| E. | E |
| Answer» B. F | |
| 199. |
The speed of gas turbine is usually |
| A. | Same as natural frequency of vibrations |
| B. | Below the natural frequency of vibrations |
| C. | Well above the natural frequency of vibrations |
| D. | Not connected with natural frequency of vibrations |
| E. | None of the above |
| Answer» C. Well above the natural frequency of vibrations | |
| 200. |
The direction of Corioli's component of acceleration is |
| A. | The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link |
| B. | The direction of relative velocity vector for the two coincidental points rotated by 180? in the direction of the angular velocity of the rotation of the link |
| C. | The direction of relative velocity vector for the two coincidental points in the direction directly opposite to that of angular velocity |
| D. | The direction at right angles to that of relative angular velocity vector |
| E. | None of the above |
| Answer» A. The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link | |
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