McqMate
Chapters
| 1. |
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 | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
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. | |
| 7. |
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 | |
| 8. |
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 | |
| 9. |
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. | |
| 10. |
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 | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
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 | |
| 14. |
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 | |
| 15. |
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 | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
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 | |
| 19. |
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 | |
| 20. |
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 | |
| 21. |
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 | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
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 | |
| 25. |
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 | |
| 26. |
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 | |
| 27. |
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 | |
| 28. |
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) | |
| 29. |
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 | |
| 30. |
What does the accelerometer measure? |
| A. | Mass |
| B. | Acceleration |
| C. | Velocity |
| D. | Distance |
| Answer» B. Acceleration | |
| 31. |
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 | |
| 32. |
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 | |
| 33. |
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 | |
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