MCQOPTIONS
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MCQOPTIONS
This section includes 287 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Temperature monitoring technique uses which of the following devices to measure temperature of the machining surfaces? |
| A. | Pyrometers |
| B. | Thermocouples |
| C. | Thermometers |
| D. | All of the above |
| Answer» E. | |
| 202. |
In order to achieve stability, the sum of secondary forces and secondarycouples must be ------- and their respective polygons must be …...... |
| A. | Zero, Closed |
| B. | one, Open |
| C. | Zero, open |
| D. | one, closed |
| Answer» B. one, Open | |
| 203. |
It is an audio transducer that converts acoustic pressure in air into its equivalentelectrical impulses |
| A. | Loudspeaker |
| B. | Amplifier |
| C. | Baffle |
| D. | Microphone |
| Answer» E. | |
| 204. |
A V-twin engine has the cylinder axes at 90 degrees and the connecting rods operate a common crank. The reciprocating mass per cylinder is 34.5 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? |
| A. | 2.238 |
| B. | 2.508 |
| C. | 2.754 |
| D. | 2.908 |
| Answer» C. 2.754 | |
| 205. |
From the following data of a 60 degree V-twin engine, determine the minimum value for primary forces in newtons:Reciprocating mass per cylinder = 1.5 Kg Stroke length = 10 cm Length of connecting rod = 25 cm Engine speed = 2500 rpm |
| A. | 7711 |
| B. | 4546 |
| C. | 2570 |
| D. | 8764 |
| Answer» D. 8764 | |
| 206. |
What is the function of the controller in active vibration isolation systems? |
| A. | Detect vibrations to be controlled |
| B. | Reposition the masses |
| C. | Interpret detected vibrations and execute commands |
| D. | All of the above |
| Answer» D. All of the above | |
| 207. |
Through which medium does sound travel fastest? |
| A. | Air |
| B. | Steel |
| C. | Water |
| D. | Mercury |
| Answer» C. Water | |
| 208. |
Which of the following statements is correct about the balancing of amechanical system? |
| A. | If it is under static balance, then there will be dynamic balance also |
| B. | If it is under dynamic balance, then there will be static balance also |
| C. | Both static as well as dynamic balance have to be achieved separately |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 209. |
In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction. |
| A. | B in clockwise C in anticlockwise |
| B. | C in clockwise B in anticlockwise |
| C. | B and C in clockwise |
| D. | B and C in anticlockwise |
| Answer» D. B and C in anticlockwise | |
| 210. |
A microphone that uses the piezoelectric effect |
| A. | Dynamic |
| B. | Condenser |
| C. | Crystal |
| D. | Carbon |
| Answer» D. Carbon | |
| 211. |
From the given data, find the balancing mass’s inclination in degrees if r=0.2m required in the same plane.Masses = 200kg, 300kg, 240 kg, 260Kg, |
| A. | 201.48 |
| B. | 200.32 |
| C. | 210.34 |
| D. | 202.88 |
| Answer» B. 200.32 | |
| 212. |
Seismometer can be used to measure acceleration of any instrument only if _____ |
| A. | it's natural frequency is high |
| B. | it generates output signal which is proportional to relative acceleration of the vibrating object |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 213. |
In a locomotive, the ratio of the connecting rod length to the crank radius iskept very large in order to |
| A. | minimize the effect of primary forces |
| B. | minimize the effect of secondary forces |
| C. | have perfect balancing |
| D. | start the locomotive conveniently |
| Answer» C. have perfect balancing | |
| 214. |
Frequency is equal to ______. |
| A. | Time period |
| B. | 1/time period |
| C. | ω * time period |
| D. | ω /time period |
| Answer» C. ω * time period | |
| 215. |
In balancing of single-cylinder engine, the rotating unbalance is ____________ |
| A. | completely made zero and so also the reciprocating unbalance |
| B. | completely made zero and the reciprocating unbalance is partially reduced |
| C. | partially reduced and the reciprocating unbalance is completely made zero |
| D. | partially reduced and so also the reciprocating unbalance |
| Answer» C. partially reduced and the reciprocating unbalance is completely made zero | |
| 216. |
A V-twin engine has the cylinder axes at 90 degrees and the connecting rods operate a common crank. The reciprocating mass per cylinder is 11.5 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? |
| A. | 736 |
| B. | 836 |
| C. | 936 |
| D. | 636 |
| Answer» C. 936 | |
| 217. |
In FFT Spectrum Analyzer, the attenuator is used to ________. |
| A. | reject unwanted signals |
| B. | sets the level of the signals to be fed to the A/D converter |
| C. | convert analog signals into digital signals |
| D. | converts digital signals into analog signals |
| Answer» C. convert analog signals into digital signals | |
| 218. |
For a vibration system having different shaft parameters, calculatewhich of the following cannot be the diameter of the equivalent shaft if the diameters of shafts in m are: 0.05, 0.06, 0.07. |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.07 |
| D. | 0.08 |
| Answer» E. | |
| 219. |
Main sources of noise pollution are |
| A. | Transportation equipment only |
| B. | Heavy machinery only |
| C. | Musical instruments |
| D. | Transportation equipment and heavy machinery |
| Answer» E. | |
| 220. |
Unit for Reference sound intensity is_________. |
| A. | W/m2 |
| B. | W/mm3 |
| C. | W/cm3 |
| D. | None of the above |
| Answer» B. W/mm3 | |
| 221. |
In the given figure, m1=10 Kg, m2=30Kg and m=50 Kg, if r=0.3m, l=1m, findl2 = 0.5m, find r1 in m. |
| A. | 1.5 |
| B. | 0.75 |
| C. | 3 |
| D. | 6 |
| Answer» C. 3 | |
| 222. |
White noise is random noise that has a audible frequency rangefrom |
| A. | 320 to 100 KHz |
| B. | 20 to 20KHtz |
| C. | 120 to 20KHtz |
| D. | 220 to 20KHtz |
| Answer» C. 120 to 20KHtz | |
| 223. |
It describes the output of a microphone over a range of frequencies. |
| A. | Directivity |
| B. | Sensitivity |
| C. | Frequency response |
| D. | All of the above |
| Answer» D. All of the above | |
| 224. |
For a gearing system, the equivalent system is made consisting of two rotors. How many nodes will this new equivalent system will have? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 225. |
When sound interacts with materials and boundaries, it displays all the |
| A. | Heat |
| B. | Waves |
| C. | Light |
| D. | Electricity |
| Answer» C. Light | |
| 226. |
The numerical values of the secondary forces and secondary couples couplesmay be obtained by considering the ___________ |
| A. | Revolving mass |
| B. | Reciprocating mass |
| C. | Translating mass |
| D. | Rotating mass |
| Answer» B. Reciprocating mass | |
| 227. |
Which of the following instruments measure the amplitude of a vibrating body? |
| A. | Vibrometers |
| B. | Seismometer |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 228. |
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» C. 300.866 kn-m | |
| 229. |
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» B. 11.046 kn-m | |
| 230. |
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» B. 25 rpm | |
| 231. |
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» C. 30 rpm | |
| 232. |
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» B. 5.7 | |
| 233. |
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» B. 181 | |
| 234. |
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» E. | |
| 235. |
05, 0.06, 0.07. |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.07 |
| D. | 0.08 |
| Answer» E. | |
| 236. |
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» B. 0.795m | |
| 237. |
85m, kb = 0.55m C = 80 GN/m2 |
| A. | 3.37 |
| B. | 7.95 |
| C. | 6.95 |
| D. | 5.95 |
| Answer» B. 7.95 | |
| 238. |
6m, l2=0.5m, l3=0.4m |
| A. | 8.95 |
| B. | 7.95 |
| C. | 6.95 |
| D. | 5.95 |
| Answer» B. 7.95 | |
| 239. |
5 m. Find the natural frequency of torsional vibrations. |
| A. | 5.32 |
| B. | 5.86 |
| C. | 5.65 |
| D. | 6.66 |
| Answer» B. 5.86 | |
| 240. |
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» E. | |
| 241. |
Determine the static deflection of the shaft in mm. |
| A. | 0.147 |
| B. | 0.213 |
| C. | 0.132 |
| D. | 0.112 |
| Answer» B. 0.213 | |
| 242. |
01mm. |
| A. | 44.14 |
| B. | 49.85 |
| C. | 43.43 |
| D. | 46.34 |
| Answer» C. 43.43 | |
| 243. |
Calculate the natural longitudinal frequency in Hz. |
| A. | 575 |
| B. | 625 |
| C. | 525 |
| D. | 550 |
| Answer» B. 625 | |
| 244. |
1 mm. |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.5 |
| D. | 0.6 |
| Answer» E. | |
| 245. |
Determine the frequency of transverse vibrations of the shaft. |
| A. | 31 |
| B. | 35 |
| C. | 37 |
| D. | 41 |
| Answer» E. | |
| 246. |
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? |
| A. | 2.238 |
| B. | 2.508 |
| C. | 2.754 |
| D. | 2.908 |
| Answer» C. 2.754 | |
| 247. |
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? |
| A. | 7172 |
| B. | 1672 |
| C. | 1122 |
| D. | 1272 |
| Answer» C. 1122 | |
| 248. |
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? |
| A. | 736 |
| B. | 836 |
| C. | 936 |
| D. | 636 |
| Answer» C. 936 | |
| 249. |
The system is automatically statically balanced. |
| A. | 1, 2, 3 and 4 |
| B. | 1, 2, and 3 only |
| C. | 2, 3 and 4 only |
| D. | 1, 3 and 4 only |
| Answer» E. | |
| 250. |
6m c = 2/3 |
| A. | 6978 |
| B. | 7574 |
| C. | 6568 |
| D. | 7374 |
| Answer» B. 7574 | |