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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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