McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 101. |
From the given data, calculate the unbalanced centrifugal force in N s2 Distance from shaft = 0.2 m Mass = 100 kg Rotating speed = 1000 rpm. |
| A. | 20 |
| B. | 2×10^7 |
| C. | 200 |
| D. | 20000 |
| Answer» C. 200 | |
| 102. |
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» D. 10 | |
| 103. |
In the given figure, m1=20 Kg, m2=30Kg and m=50 Kg, if r1=0.2m and r=0.3m, l=1m, find l2. |
| A. | 0.26m |
| B. | 0.52m |
| C. | 1.04m |
| D. | 13m |
| Answer» A. 0.26m | |
| 104. |
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» B. It analysis noise signal in frequency domain into various frequency bands by electronically separating the signal | |
| 105. |
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» C. Interpret detected vibrations and execute commands | |
| 106. |
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» D. All of the above | |
| 107. |
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» A. Stroboscope is non-contact type frequency instrument | |
| 108. |
Which type of frequency measuring instrument has multiple reeds of different natural frequency to measure vibrations? |
| A. | Fullarton tachometer |
| B. | Frahm Tachometer |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Frahm Tachometer | |
| 109. |
Which of the following instruments measure amplitude of a vibrating body? |
| A. | Vibrometers |
| B. | Seismometer |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 110. |
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» A. Accelerometers | |
| 111. |
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» B. Basic condition monitoring system | |
| 112. |
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» C. both a. and b. | |
| 113. |
In FFT Spectrum Analyzer, the D/A converter 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» D. converts digital signals into analog signals | |
| 114. |
In FFT Spectrum Analyzer, the A/D converter 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 | |
| 115. |
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» B. sets the level of the signals to be fed to the A/D converter | |
| 116. |
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» A. reject unwanted signals | |
| 117. |
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» C. both natural frequencies and mode shapes | |
| 118. |
Fourier transform is a mathematical procedure to obtain the __________ of a given input signal. |
| A. | spectrum |
| B. | integration |
| C. | difference |
| D. | none of the above |
| Answer» A. spectrum | |
| 119. |
In FFT Spectrum Analyzer, FFT stands for _______. |
| A. | Frequency Fourier Transform |
| B. | Fast Fourier Transmission |
| C. | Frequency Fourier Transmission |
| D. | Fast Fourier Transform |
| Answer» D. Fast Fourier Transform | |
| 120. |
From the following, which one is used in an accelerometer? |
| A. | Dielectric crystals |
| B. | Piezoelectric crystals |
| C. | Optic crystals |
| D. | Diamond |
| Answer» B. Piezoelectric crystals | |
| 121. |
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» D. small size and high sensitivity | |
| 122. |
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» C. Vibrometer | |
| 123. |
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» D. all of the above | |
| 124. |
From the following, which one is also known as low-frequency Transducer? |
| A. | Stroboscope |
| B. | Accelerometer |
| C. | Vibrometer |
| D. | None of the above |
| Answer» C. Vibrometer | |
| 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» D. All of the above | |
| 126. |
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» C. acceleration | |
| 127. |
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» A. Rpm of a flywheel | |
| 128. |
A seismometer is a device used to measure the ___________ of a vibrating body. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» A. displacement | |
| 129. |
The instruments which are used to measure the ___________ of a vibrating body are called vibration measuring instrument. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» D. all of the above | |
| 130. |
The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design 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» C. its natural frequency is equal to the frequency of vibration | |
| 131. |
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» C. Both (a) and (b) | |
| 132. |
Which of the following systems produce a vibration in the foundation? |
| A. | Coupled machine |
| B. | Uncoupled machine |
| C. | Balanced machine |
| D. | Unbalanced machine |
| Answer» D. Unbalanced machine | |
| 133. |
What does the accelerometer measure? |
| A. | Mass |
| B. | Acceleration |
| C. | Velocity |
| D. | Distance |
| Answer» B. Acceleration | |
| 134. |
Which of the following device can be used for measurement of frequency? |
| A. | Voltmeter |
| B. | Ammeter |
| C. | Stroboscope |
| D. | None of the mentioned |
| Answer» C. Stroboscope | |
| 135. |
Which of the following is correct regarding isolation factor? |
| A. | Dimensionless quantity |
| B. | Has Newton as its unit |
| C. | Has joule as its Unit |
| D. | Has Hz as its unit |
| Answer» A. Dimensionless quantity | |
| 136. |
If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor? |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | Infinity |
| Answer» D. Infinity | |
| 137. |
Which part of human ear converts sound vibrations into electrical signals |
| A. | Hammer |
| B. | Stirrup |
| C. | Tympanic membrane |
| D. | Cochlea |
| Answer» D. Cochlea | |
| 138. |
Sound is measured by units that are called |
| A. | Hertz (Hz) |
| B. | Decibels (dB) |
| C. | Meters (m) |
| D. | Pascal (Pa) |
| Answer» B. Decibels (dB) | |
| 139. |
'Eardrum' bursts at |
| A. | 40 dB |
| B. | 80 dB |
| C. | 160 dB |
| D. | 320 dB |
| Answer» C. 160 dB | |
| 140. |
The loudness of sound varies directly with the vibrating body's |
| A. | Intensity |
| B. | Amplitude |
| C. | Pitch |
| D. | Quality |
| Answer» B. Amplitude | |
| 141. |
The scale to measure the intensity level of sound is called |
| A. | Vector scale |
| B. | Measuring ruler |
| C. | Bel scale |
| D. | decibel scale |
| Answer» D. decibel scale | |
| 142. |
Pitch of the sound depends upon |
| A. | Frequency |
| B. | Distance of sound |
| C. | Amplitude |
| D. | Temperature |
| Answer» A. Frequency | |
| 143. |
Noise is |
| A. | An unwanted noise |
| B. | An irritant |
| C. | A source of stress |
| D. | all of the above |
| Answer» D. all of the above | |
| 144. |
Following scale is used for loudness of sound or noise |
| A. | Linear scale |
| B. | Logarithmic scale |
| C. | Exponential scale |
| D. | None of the above |
| Answer» B. Logarithmic scale | |
| 145. |
Sound Intensity is given by. |
| A. | I=w/s |
| B. | I=s/w |
| C. | w=I/s |
| D. | s=w/I |
| Answer» A. I=w/s | |
| 146. |
Unit for Reference sound intensity is_________. |
| A. | W/m2 |
| B. | W/mm3 |
| C. | W/cm3 |
| D. | None of the above |
| Answer» A. W/m2 | |
| 147. |
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» A. 3.16 w | |
| 148. |
The process of maintaining appropriate noise level without considering economic factors is called as _____ |
| A. | noise control |
| B. | noise reduction |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. noise reduction | |
| 149. |
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» A. Source ,Path ,Receiver of noise | |
| 150. |
All sound is noise. |
| A. | TRUE |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
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