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Home ‣ Mechanical Engineering ‣ Theory of machines See What Others Are Saying!
  • Question

  • In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to


  • Options
  • A. 0.2
  • B. 0.4
  • C. 0.6
  • D. 0.8

  • Correct Answer
  • 0.6 

    • More questions

    • 1. According to Bernoulli's equation

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. When the piston is at T.D.C, the volume above the piston in the combustion chamber is the

    • Options
    • A. clearance volume
    • B. cylinder volume
    • C. exhaust volume
    • D. none of these
      • Discuss
    • 4. During dehumidification process, the relative humidity

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 5. A diamond locating pin is used in jigs and fixtures because

    • Options
    • A. diamond is very hard and wear resistant
    • B. it occupies very little space
    • C. it helps in assembly with tolerance on centre distance
    • D. it has a long life
      • Discuss
    • 6. The maximum temperature in a gas turbine is

    • Options
    • A. 200°C
    • B. 500°C
    • C. 700°C
    • D. 1000°C
      • Discuss
    • 7. The flow at critical depth in an open channel is called torrential flow.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 8. Glazing in grinding wheels takes place when the

    • Options
    • A. wheel is too hard or wheel revolves at a very high speed
    • B. wheel is too soft or wheel revolves at a very slow speed
    • C. wheel is too hard and wheel revolves at very slow speed
    • D. wheel is too soft and wheel revolves at a very high speed
      • Discuss
    • 9. The swing diameter over carriage is always less than the swing diameter over bed.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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