McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
01mm. |
| A. | 44.14 |
| B. | 49.85 |
| C. | 43.43 |
| D. | 46.34 |
| Answer» B. 49.85 | |
| 152. |
Determine the frequency of transverse vibrations of the shaft. |
| A. | 31 |
| B. | 35 |
| C. | 37 |
| D. | 41 |
| Answer» D. 41 | |
| 153. |
Determine the static deflection of the shaft in mm. |
| A. | 0.147 |
| B. | 0.213 |
| C. | 0.132 |
| D. | 0.112 |
| Answer» A. 0.147 | |
| 154. |
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. |
| A. | 8.64 |
| B. | 9.64 |
| C. | 10.64 |
| D. | 12.2 |
| Answer» D. 12.2 | |
| 155. |
5 m. Find the natural frequency of torsional vibrations. |
| A. | 5.32 |
| B. | 5.86 |
| C. | 5.65 |
| D. | 6.66 |
| Answer» A. 5.32 | |
| 156. |
6m, l2=0.5m, l3=0.4m |
| A. | 8.95 |
| B. | 7.95 |
| C. | 6.95 |
| D. | 5.95 |
| Answer» A. 8.95 | |
| 157. |
85m, kb = 0.55m C = 80 GN/m2 |
| A. | 3.37 |
| B. | 7.95 |
| C. | 6.95 |
| D. | 5.95 |
| Answer» A. 3.37 | |
| 158. |
095m, d2=0.06m, d3=0.05m Ma = 900 Kg, Mb = 700 Kg |
| A. | 0.855m |
| B. | 0.795m |
| C. | 0.695m |
| D. | 0.595m |
| Answer» A. 0.855m | |
| 159. |
05, 0.06, 0.07. |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.07 |
| D. | 0.08 |
| Answer» D. 0.08 | |
| 160. |
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 |
| A. | 171 |
| B. | 181 |
| C. | 191 |
| D. | 201 |
| Answer» A. 171 | |
| 161. |
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 |
| A. | 257 |
| B. | 281 |
| C. | 197 |
| D. | 277 |
| Answer» D. 277 | |
| 162. |
Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz. |
| A. | 4.7 |
| B. | 5.7 |
| C. | 4.5 |
| D. | 5.5 |
| Answer» A. 4.7 | |
| 163. |
5 and the mean speed is 20 rpm, find the maximum speed. |
| A. | 15 rpm |
| B. | 25 rpm |
| C. | 30 rpm |
| D. | 40 rpm |
| Answer» B. 25 rpm | |
| 164. |
5 and the mean speed is 20 rpm, find the minimum speed. |
| A. | 15 rpm |
| B. | 25 rpm |
| C. | 30 rpm |
| D. | 40 rpm |
| Answer» A. 15 rpm | |
| 165. |
3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft. |
| A. | 10.046 kn-m |
| B. | 11.046 kn-m |
| C. | 12.046 kn-m |
| D. | 13.046 kn-m |
| Answer» A. 10.046 kn-m | |
| 166. |
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. |
| A. | 100.866 kn-m |
| B. | 200.866 kn-m |
| C. | 300.866 kn-m |
| D. | 400.866 kn-m |
| Answer» B. 200.866 kn-m | |
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