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From the following, which one is also known as low-frequency Transducer?


A) Stroboscope
B) Accelerometer
C) Vibrometer
D) None of the above

E) A) and D)
F) All of the above

Correct Answer

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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

E) A) and B)
F) B) and D)

Correct Answer

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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

E) A) and D)
F) A) and C)

Correct Answer

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In FFT Spectrum Analyzer, FFT stands for _______.


A) Frequency Fourier Transform
B) Fast Fourier Transmission
C) Frequency Fourier Transmission
D) Fast Fourier Transform

E) B) and C)
F) A) and C)

Correct Answer

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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

E) B) and D)
F) B) and C)

Correct Answer

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Which of the following vibrometers have frequency ratio (?/?n) << 1?


A) Accelerometers
B) Velometers
C) Both a. and b.
D) None of the above

E) B) and D)
F) B) and C)

Correct Answer

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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

E) A) and B)
F) A) and C)

Correct Answer

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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

E) B) and C)
F) A) and D)

Correct Answer

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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

E) A) and D)
F) A) and C)

Correct Answer

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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

E) C) and D)
F) All of the above

Correct Answer

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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

E) All of the above
F) B) and D)

Correct Answer

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From the following, which one is used in an accelerometer?


A) Dielectric crystals
B) Piezoelectric crystals
C) Optic crystals
D) Diamond

E) C) and D)
F) A) and D)

Correct Answer

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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

E) C) and D)
F) None of the above

Correct Answer

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C

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

E) A) and B)
F) A) and C)

Correct Answer

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From the following, which one is a type of vibration measuring instrument?


A) Mechanical
B) Electrical
C) Magnetic
D) All of the above

E) All of the above
F) B) and C)

Correct Answer

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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

E) All of the above
F) C) and D)

Correct Answer

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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

E) B) and C)
F) A) and D)

Correct Answer

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A

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

E) None of the above
F) A) and B)

Correct Answer

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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

E) All of the above
F) B) and C)

Correct Answer

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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

E) None of the above
F) A) and B)

Correct Answer

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B

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