Dynamics of Machinary MCQs with answers Page - 13

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Q. 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

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Q. 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

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Q. 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

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Q. 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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Q. 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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Q. 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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Q. 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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Q. 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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Q. 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

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Q. 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

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