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.
| 151. |
From the given data, find the balancing mass in Kg if r=0.2m required in the same plane.Masses = 200kg, 300kg, 240 kg, 260Kg, corresponding radii = 0.2m, 0.15m, 0.25m and 0.3m.Angles between consecutive masses = 45, 75 and 135 degrees. |
| A. | 116 |
| B. | 58 |
| C. | 232 |
| D. | 140 |
| Answer» B. 58 | |
| 152. |
According to which method, maximum kinetic energy at mean position isequal to maximum potential energy at extreme position? |
| A. | Energy method |
| B. | Rayleigh's method |
| C. | Equilibrium method |
| D. | All of the above |
| Answer» C. Equilibrium method | |
| 153. |
From the following, which one is used in an accelerometer? |
| A. | Dielectric crystals |
| B. | Piezoelectric crystals |
| C. | Optic crystals |
| D. | Diamond |
| Answer» C. Optic crystals | |
| 154. |
The scale to measure the intensity level of sound is called |
| A. | Vector scale |
| B. | Measuring ruler |
| C. | Bel scale |
| D. | decibel scale |
| Answer» E. | |
| 155. |
Which of the following is true for centrifugal force causing unbalance? |
| A. | Direction changes with rotation |
| B. | Magnitude changes with rotation |
| C. | Direction and magnitude both change with rotation |
| D. | Direction and magnitude both remain unchanged with rotation |
| Answer» B. Magnitude changes with rotation | |
| 156. |
The time interval after which the motion is repeated itself is known as ___________ . |
| A. | Time period |
| B. | Cycle |
| C. | Frequency |
| D. | Isolation |
| Answer» B. Cycle | |
| 157. |
Which of the following statements is true about stroboscope? |
| A. | Stroboscope is non-contact type frequency instrument |
| B. | Stroboscope can measure frequency upto 5 Hz |
| C. | Stroboscope uses electromagnetic radiations to measure frequency |
| D. | All of the above |
| Answer» B. Stroboscope can measure frequency upto 5 Hz | |
| 158. |
Sound is measured by units that are called |
| A. | Hertz (Hz) |
| B. | Decibels (dB) |
| C. | Meters (m) |
| D. | Pascal (Pa) |
| Answer» C. Meters (m) | |
| 159. |
In a spring-mass-damper system, which of the following force is considered? |
| A. | Spring force |
| B. | Damping force |
| C. | Accelerating force |
| D. | All of the above |
| Answer» E. | |
| 160. |
The loudness of sound varies directly with the vibrating body's |
| A. | Intensity |
| B. | Amplitude |
| C. | Pitch |
| D. | Quality |
| Answer» C. Pitch | |
| 161. |
In FFT Spectrum Analyzer, the filter 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» B. sets the level of the signals to be fed to the A/D converter | |
| 162. |
Which of the following is incorrect regarding inertia force? |
| A. | Imaginary force |
| B. | Acts upon a rigid body |
| C. | Brings the body to equilibrium |
| D. | Same direction as of accelerating force |
| Answer» E. | |
| 163. |
When inertia of gearing is taken into consideration, then which ofthe following should be taken into account. |
| A. | Addition of rotor |
| B. | Addition of gear |
| C. | Addition of shaft |
| D. | Addition of pump |
| Answer» B. Addition of gear | |
| 164. |
In a spring-mass system, which of the following force is not considered? |
| A. | Spring force |
| B. | Damping force |
| C. | Accelerating force |
| D. | A and B |
| Answer» C. Accelerating force | |
| 165. |
Fourier transform is a mathematical procedure to obtain the __________ of a given inputsignal. |
| A. | spectrum |
| B. | integration |
| C. | difference |
| D. | none of the above |
| Answer» B. integration | |
| 166. |
FFT analyzer can be used to find the ___________. |
| A. | natural frequencies |
| B. | mode shapes |
| C. | both natural frequencies and mode shapes |
| D. | none of the above |
| Answer» D. none of the above | |
| 167. |
During transverse vibrations, shaft is subjected to which type of stresses? |
| A. | Tensile stresses |
| B. | Torsional shear stress |
| C. | Bending stresses |
| D. | All of the above |
| Answer» D. All of the above | |
| 168. |
The periodic time is given by _______. |
| A. | ω / 2 π |
| B. | 2 π / ω |
| C. | 2 π × ω |
| D. | π/ω |
| Answer» C. 2 π × ω | |
| 169. |
Sound Intensity is given by. |
| A. | I=w/s |
| B. | I=s/w |
| C. | w=I/s |
| D. | s=w/I |
| Answer» B. I=s/w | |
| 170. |
At a nodal point in the shaft, the frequency of vibration is_________ |
| A. | Zero |
| B. | Double than at the ends |
| C. | Minimum |
| D. | Maximum |
| Answer» B. Double than at the ends | |
| 171. |
Basic elements of noise control are |
| A. | Source ,Path ,Receiver of noise |
| B. | Amplitude and Frequency |
| C. | Time period |
| D. | A and B both |
| Answer» B. Amplitude and Frequency | |
| 172. |
What is the number of nodes in a shaft carrying three rotors? |
| A. | zero |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 173. |
The sound can travel in air when: |
| A. | Particles of medium travel from one place to another |
| B. | There is no moisture in the atmosphere |
| C. | Disturbance travel from one place to another |
| D. | Both particles as well as disturbance travel from one place to another |
| Answer» D. Both particles as well as disturbance travel from one place to another | |
| 174. |
n the given figure if N is the node then NQ acts as which of thefollowing system? |
| A. | Single rotor system |
| B. | Two rotor system |
| C. | Three rotor system |
| D. | Four rotor system |
| Answer» B. Two rotor system | |
| 175. |
In a gearing system, pump speed is one third of the motor. Shaft from motor is 6 cm in diameter and 30cm long, the impellar shaft is 10cm diameter and 60cm long. Mass moment of inertia is 1500 Kgm2, C = 80Gn/m2. 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 | |
| 176. |
Pitch of the sound depends upon |
| A. | Frequency |
| B. | Distance of sound |
| C. | Amplitude |
| D. | Temperature |
| Answer» B. Distance of sound | |
| 177. |
In damped free vibrations, which parameters indicate vibrations? |
| A. | Natural frequency |
| B. | Rate of decay of amplitude |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 178. |
During torsional vibration of a shaft, the node is characterized by |
| A. | Maximum angular velocity |
| B. | Maximum angular displacement |
| C. | Maximum angular acceleration |
| D. | Zero angular displacement |
| Answer» E. | |
| 179. |
The process of maintaining appropriate noise level without consideringeconomic factors is called as _____ |
| A. | noise control |
| B. | noise reduction |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 180. |
Increasing which of the following factor would result in increase of free torsional vibration? |
| A. | Radius of gyration |
| B. | Mass moment of inertia |
| C. | Polar moment of inertia |
| D. | Length |
| Answer» D. Length | |
| 181. |
Stroboscope is used for the measurement of _________________? |
| A. | Rpm of a flywheel |
| B. | Frequency of light |
| C. | Depression of freezing point |
| D. | Liquid level under pressure |
| Answer» B. Frequency of light | |
| 182. |
Absorption coefficient (α) is the rario of intensity of sound ______________. |
| A. | Absorbed / Incident. |
| B. | Incident / Reflected. |
| C. | Absorbed / Incident. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 183. |
Let the disturbing mass be 50 Kg, with radius of rotation = 0.1m, if one of the balancing mass is 30 Kg at a radius of rotation 0.1m then find the other balancing mass situated at a distance of 0.2m. |
| A. | 80 |
| B. | 40 |
| C. | 20 |
| D. | 10 |
| Answer» E. | |
| 184. |
Which of the following can not travel through a vacuum? |
| A. | Electromagnetic wave |
| B. | Radio wave |
| C. | Sound wave |
| D. | Light wave |
| Answer» D. Light wave | |
| 185. |
An accelerometer is an instrument used to measure the _________ of a vibrating body. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» D. all of the above | |
| 186. |
Which of the following vibrations are classified according to magnitude ofactuating force? |
| A. | Torsional vibrations |
| B. | Deterministic vibrations |
| C. | Transverse vibrations |
| D. | All of the above |
| Answer» C. Transverse vibrations | |
| 187. |
If the unbalanced system is not set right then. |
| A. | Static forces develop |
| B. | Dynamic forces develop |
| C. | Tangential forces develop |
| D. | Radial forces develop |
| Answer» B. Dynamic forces develop | |
| 188. |
Measurement of noise can be made in following environment ____________ |
| A. | Anechoic Chamber |
| B. | Semi - anechoic Chamber |
| C. | Reverberant Chamber |
| D. | All the above |
| Answer» E. | |
| 189. |
Sound wave has two main characteristics which are |
| A. | Pitch and loudness |
| B. | Tone and loudness |
| C. | Highness and loudness |
| D. | Rarefaction and compression |
| Answer» B. Tone and loudness | |
| 190. |
For a two rotor system, the mass moment of inertia of one shaft(A) is twice theother(B), then what is the relation between the length of the shafts. |
| A. | 2L(A) = L(B) |
| B. | L(A) = 2L(B) |
| C. | L(A) = L(B) |
| D. | 2L(A) = 3L(B) |
| Answer» B. L(A) = 2L(B) | |
| 191. |
Which among the following is the value of static deflection (δ) for a fixedbeam with central point load? |
| A. | (Wl3) /(192 EI) |
| B. | (Wl2) /(192 EI) |
| C. | (Wl3) /(384 EI) |
| D. | None of the above |
| Answer» B. (Wl2) /(192 EI) | |
| 192. |
A vertical spring-mass system has a mass of 0.5 kg and an initial deflectionof 0.2 cm. Find the spring stiffness. |
| A. | 345 N/m |
| B. | 245 N/m |
| C. | 3452 N/m |
| D. | 2452 N/m |
| Answer» E. | |
| 193. |
Which of the following statements are associated with complete dynamic balancing of rotating systems? 1. Resultant coupledue to all inertia forces is zero. 2. Support reactions due to forces are zero but not due to couples . 3. The system is automatically statically balanced. 4. Centre of masses of the system lies on the axis of rotation. |
| 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. | |
| 194. |
For occurrence of free torsional vibration which of the condition isnecessary? |
| A. | Rotors moving in same direction |
| B. | Rotors having same frequency |
| C. | Rotors having different frequency |
| D. | Rotors rotate in the same sense |
| Answer» C. Rotors having different frequency | |
| 195. |
Which type of vibrations are also known as transient vibrations? |
| A. | Undamped vibrations |
| B. | Damped vibrations |
| C. | Torsional vibrations |
| D. | Transverse vibrations |
| Answer» C. Torsional vibrations | |
| 196. |
_________ is the sound power measured over the area upon which is received. |
| A. | Sound pressure |
| B. | Sound energy |
| C. | Sound intensity |
| D. | Sound pressure level |
| Answer» D. Sound pressure level | |
| 197. |
When the body vibrates under the influence of external force, then the bodyis said to be under ___________ . |
| A. | Free vibrations |
| B. | Natural vibrations |
| C. | Forced vibrations |
| D. | Damped vibrations |
| Answer» D. Damped vibrations | |
| 198. |
In a system with different shaft parameters ------------- is takenwhich depends on the length and diameters of each shaft. |
| A. | Equivalent shaft length |
| B. | length of first shaft |
| C. | lrngth of intermediate shaft |
| D. | None of these |
| Answer» B. length of first shaft | |
| 199. |
Sound power of a machine whose specified sound power level is 125 dB |
| A. | 3.16 w |
| B. | 4.2w |
| C. | 5w |
| D. | 31.6w |
| Answer» B. 4.2w | |
| 200. |
D-Alembert’s principle is used for which of the following? |
| A. | Change static problem into a dynamic problem |
| B. | Change dynamic problem to static problem |
| C. | To calculate moment of inertia of rigid bodies |
| D. | To calculate angular momentum of a system of masses |
| Answer» C. To calculate moment of inertia of rigid bodies | |