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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.
| 101. |
From the following data of a 60 degree V-twin engine, determine the maximum 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» B. 4546 | |
| 102. |
A system has a mass of 0.5 kg and spring stiffness of 2452 N/m. Find thenatural frequency of the system. |
| A. | 5.14 Hz |
| B. | 9.14 Hz |
| C. | 11.14 Hz |
| D. | 28.14 Hz |
| Answer» D. 28.14 Hz | |
| 103. |
In a system with different shaft parameters, the longest shaft istaken for calculations. |
| A. | TRUE |
| B. | FALSE |
| Answer» C. | |
| 104. |
The sound waves behave in a much more complex fashion, and there is no fixedrelationship between ________________. |
| A. | Sound pressure |
| B. | pressure and distance |
| C. | Sound energy |
| D. | Sound intensity |
| Answer» C. Sound energy | |
| 105. |
Which best describe the sound wave? |
| A. | It may be longitudinal |
| B. | It is always transverse |
| C. | It is always longitudinal |
| D. | All of the above |
| Answer» D. All of the above | |
| 106. |
Vibration measuring instruments are classified on the basis of ____________. |
| A. | contact between the vibrating system and measuring instrument |
| B. | the requirement of power source |
| C. | method of measurements |
| D. | all of the above |
| Answer» E. | |
| 107. |
The accelerometer is used as a transducer to measure earthquake in Richter scale. Itsdesign is based on the principle that ______. |
| A. | its natural frequency is very low in comparison to the frequency of vibration |
| B. | its natural frequency is very high in comparison to the frequency of vibration |
| C. | its natural frequency is equal to the frequency of vibration |
| D. | measurement of vibratory motion is without any reference point |
| Answer» D. measurement of vibratory motion is without any reference point | |
| 108. |
Which type of frequency measuring instrument has multiple reeds of different naturalfrequency to measure vibrations? |
| A. | Fullarton tachometer |
| B. | Frahm Tachometer |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 109. |
Reflection coefficient (Γ) is the rario of intensity of sound ______________. |
| A. | Reflected / Incident. |
| B. | Incident / Reflected. |
| C. | Absorbed / Reflected. |
| D. | None of the above. |
| Answer» B. Incident / Reflected. | |
| 110. |
What is meant by critical damping coefficient? |
| A. | Frequency of damped free vibrations is less than zero |
| B. | The motion is aperiodic in nature |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 111. |
Two rotors A and B are connected to the two ends of a shaft ofuniform diameter. The mass moment of inertia of rotor A about the |
| A. | 1/5 m |
| B. | 4/5 m |
| C. | 1/25 m |
| D. | 16/25 m |
| Answer» B. 4/5 m | |
| 112. |
In the figure given below, the points N1 and N2 are knownas_______ |
| A. | Nodes |
| B. | Elastic points |
| C. | Inelastic points |
| D. | Breaking points |
| Answer» B. Elastic points | |
| 113. |
Keeping the mass moment of inertia of both the shafts in a two rotor system same, if the length of one shaft is doubled what should be the effect on the length of other shaft? |
| A. | Doubled |
| B. | Halved |
| C. | Constant |
| D. | increased to 4 times |
| Answer» B. Halved | |
| 114. |
A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m 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 | |
| 115. |
The velocity of a particle moving with simple harmonic motion is _______ atthe mean position. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 116. |
A system, which is fixed from one end or both the ends is referredas |
| A. | Definite system |
| B. | Semidefinite system |
| C. | Both a and b |
| D. | None of the above |
| Answer» B. Semidefinite system | |
| 117. |
What is the total number of nodes formed in a three rotor system ifthe rotors at one of the ends and the one in the middle rotate in the |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 118. |
What is meant by node point? |
| A. | The point at which amplitude of vibration is maximum |
| B. | The point at which amplitude of vibration is minimum |
| C. | The point at which amplitude of vibration is zero |
| D. | None of the above |
| Answer» D. None of the above | |
| 119. |
Secondary forces in reciprocating mass on engine frame are |
| A. | of same frequency as of primary forces |
| B. | twice the frequency as of primary forces |
| C. | four times the frequency as of primary forces |
| D. | none of the mentioned |
| Answer» C. four times the frequency as of primary forces | |
| 120. |
If the damper is not provided and the system is in resonance, which of the following is the correctisolation factor? |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | Infinity |
| Answer» E. | |
| 121. |
What are deterministic vibrations? |
| A. | Vibrations caused due to known exciting force |
| B. | Vibrations caused due to unknown exciting force |
| C. | Vibrations which are aperiodic in nature |
| D. | None of the above |
| Answer» B. Vibrations caused due to unknown exciting force | |
| 122. |
The maximum acceleration of a particle moving with simple harmonic motionis ____. |
| A. | ω |
| B. | ω.r |
| C. | ω / 2 π |
| D. | 2 π / ω |
| Answer» C. ω / 2 π | |
| 123. |
When waves bend away from straight lines of travel, it is called |
| A. | Reflection |
| B. | Diffraction |
| C. | Rarefaction |
| D. | Refraction |
| Answer» E. | |
| 124. |
Which is correct option for ear protection equipment? |
| A. | Headphone |
| B. | Use of cotton in ears |
| C. | Ear defeders ,Ear plugs |
| D. | All the above |
| Answer» D. All the above | |
| 125. |
From the following, which one is a type of vibration measuring instrument? |
| A. | Mechanical |
| B. | Electrical |
| C. | Magnetic |
| D. | All of the above |
| Answer» E. | |
| 126. |
Determine logarithmic decrement, if the amplitude of a vibrating bodyreduces to 1/6th in two cycles. |
| A. | 0.223 |
| B. | 0.8958 |
| C. | 0.389 |
| D. | None of the above |
| Answer» C. 0.389 | |
| 127. |
For occurrence of free torsional vibration in a three rotor systemwhich of the condition is necessary? |
| 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 | |
| 128. |
Consider P and Q as the shaft having two rotors at the end of it,what is the point N known as in the given figure? |
| A. | Node |
| B. | Elastic point |
| C. | Inelastic point |
| D. | Breaking point |
| Answer» B. Elastic point | |
| 129. |
Calculate logarithmic decrement if damping factor is 0.33. |
| A. | 1.36 |
| B. | 3.23 |
| C. | 5.16 |
| D. | 2.19 |
| Answer» E. | |
| 130. |
In the diagram shown below, if rotor X and rotor Z rotate insame direction and rotor Y rotates in opposite direction, then specify the type of node vibration. |
| A. | Three node vibration |
| B. | Two node vibration |
| C. | Single node vibration |
| D. | None of the above |
| Answer» C. Single node vibration | |
| 131. |
Which type of monitoring system uses stroboscope to measure speed of the machine? |
| A. | Portable condition monitoring system |
| B. | Basic condition monitoring system |
| C. | Computer based condition monitoring system |
| D. | None of the above |
| Answer» C. Computer based condition monitoring system | |
| 132. |
What is the function of frequency analyzer? |
| A. | It analysis noise signal in frequency domain into various frequency bands by magnetically separating the signal |
| B. | It analysis noise signal in frequency domain into various frequency bands by electronically separating the signal |
| C. | It analysis noise signal in frequency domain into various frequency bands by electromagnetically separating the signal |
| D. | None of the above |
| Answer» C. It analysis noise signal in frequency domain into various frequency bands by electromagnetically separating the signal | |
| 133. |
If all the masses are in one plane, then what is the maximum no. of masseswhich can be placed in the same plane? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | No limitation |
| Answer» E. | |
| 134. |
The primary unbalanced force is maximum when the angle of inclination of thecrank with the line of stroke is |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 360° |
| Answer» D. 360° | |
| 135. |
In FFT Spectrum Analyzer, FFT stands for _______. |
| A. | Frequency Fourier Transform |
| B. | Fast Fourier Transmission |
| C. | Frequency Fourier Transmission |
| D. | Fast Fourier Transform |
| Answer» E. | |
| 136. |
The frequency of the free torsional vibration depends on….... |
| A. | number of rotors |
| B. | the number of nodes |
| C. | Both a and b |
| D. | Only b |
| Answer» D. Only b | |
| 137. |
Which instrument is used to record building vibrations or vibrations of huge structures like railway bridges? |
| A. | Stroboscope |
| B. | Accelerometer |
| C. | Vibrometer |
| D. | None of the above |
| Answer» D. None of the above | |
| 138. |
Soft materials absorb a large amount of |
| A. | Heat energy |
| B. | Light energy |
| C. | Electromagnetic waves |
| D. | Sound energy |
| Answer» E. | |
| 139. |
Which among the following has a constant power spectral density over a widefrequency range? |
| A. | White noise |
| B. | Black noise |
| C. | Pink noise |
| D. | Blue noise |
| Answer» B. Black noise | |
| 140. |
For a V-twin engine, which of the following means can be used to balance theprimary forces? |
| A. | Revolving balance mass |
| B. | Rotating balance mass |
| C. | Reciprocating balance mass |
| D. | By the means of secondary forces |
| Answer» B. Rotating balance mass | |
| 141. |
Let the disturbing mass be 200 kg and the radius of rotation be 20 cm and therotation speed be 50 rad/s, then calculate the centripetal force in kN. |
| A. | -50 |
| B. | -25 |
| C. | -100 |
| D. | -2500 |
| Answer» D. -2500 | |
| 142. |
In which direction does the accelerating force acts? |
| A. | Opposite to the motion |
| B. | Along the motion |
| C. | Perpendicular to motion |
| D. | Variable |
| Answer» C. Perpendicular to motion | |
| 143. |
The accelerometers are commonly used in vibration measurement due to their ___________. |
| A. | small size and low sensitivity |
| B. | the large size and high sensitivity |
| C. | the large size and low sensitivity |
| D. | small size and high sensitivity |
| Answer» E. | |
| 144. |
Which of the following is a type of free vibration? |
| A. | Longitudinal vibrations |
| B. | Transverse vibrations |
| C. | Torsional vibrations |
| D. | A, B and C |
| Answer» E. | |
| 145. |
Which of the following vibrometers have frequency ratio (ω/ωn) << 1? |
| A. | Accelerometers |
| B. | Velometers |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Velometers | |
| 146. |
A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m 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. | |
| 147. |
In which type of vibrations, amplitude of vibration goes on decreasing everycycle? |
| A. | Damped vibrations |
| B. | Undamped vibrations |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Undamped vibrations | |
| 148. |
Fluid resistance causes damping which is known as ______ |
| A. | Resistance damping |
| B. | Fluid damping |
| C. | Viscous damping |
| D. | Liquid damping |
| Answer» D. Liquid damping | |
| 149. |
A capacitor stores energy in the form of an electrostatic field is a ______. |
| A. | Dynamic Microphone |
| B. | Condenser Microphone |
| C. | Magnetic Microphone |
| D. | Carbon Microphone |
| Answer» C. Magnetic Microphone | |
| 150. |
The technique or method to absorb undesirable sounds by soft and porous |
| A. | Acoustic protection |
| B. | Unacoustic protection |
| C. | Audible protection |
| D. | Decibel protection |
| Answer» B. Unacoustic protection | |