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1) Which type of instruments do not require separate power source for measuring vibratory response of a vibratory system? a. Active instruments b. Passive instruments c. Both a. and b. d. None of the above
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2) 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
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3) 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
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4) 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
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5) 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
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6) Transmissibility is the ratio of ______ a. force transmitted to the supporting structure and force impressed upon the system b. displacement amplitude of mass and displacement amplitude of supporting structure c. both a. and b. d. none of the above
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7) Which of the following statements is/are false for pneumatic isolators ? 1. Pneumatic isolators are used when driving frequencies below 10 Hz are present 2. Nausea is caused due to noise at low frequencies 3. At high natural frequencies, isolators can obtain efficiency of 90% 4. Pneumatic isolators have limited load carrying capacity a. Only statement 1 b. Only statement 3 c. Only statement 2, 4 d. All the above statements are false
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8) Which of the following statements is/are true for elastomers? a. Elastomers can be used for static deflections up to 12 mm b. Elastomers can provide natural frequencies below 5 Hz c. Elastomers have good performance at high frequencies d. All the above statements are true
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9) Which of the following methods can be used to control the noise level at source? a. Changing design process b. Using sound enclosures c. Controlling vibration d. All of the above
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10) 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
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