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Mechanical Engineering :: Basic Mechanical Engineering

  1. A feather key is on one the following types
  2. A.
    sunk
    B.
    tapered
    C.
    parallel
    D.
    tangent

  3. Air refrigeration cycle works on the
  4. A.
    Brayton cycle
    B.
    Bell Coleman cycle
    C.
    Carnot cycle
    D.
    Sterling cycle

  5. The moisture in air will condense at
  6. A.
    wet bulb temperature
    B.
    low point temperature
    C.
    saturaion temperature
    D.
    dry bulb temperature

  7. A low wet bulb temperature indicates
  8. A.
    cool air
    B.
    cool air with high specific humidity
    C.
    cool air with high enthalpy
    D.
    cool air with low specific humidity

  9. 1.25 kg of hydrogen are burnt with stiochiometric air, the mass of air in kg required is (choose the nearest value)
  10. A.
    10.0
    B.
    21.6
    C.
    43.5
    D.
    48.6

  11. For a spring controlled governer the relation F = ar+b (F is the controlling force, r is the radius of rotation a and b are constants), indicates that the governer is
  12. A.
    unstable
    B.
    stable
    C.
    insochronous
    D.
    satisfactory

  13. a governer in an Ic engine controls the
  14. A.
    mean speed variation
    B.
    cyclic speed variation
    C.
    load fluctuations
    D.
    exhaust gas temperature

  15. In a simple spur gear train, gears with 24, 48, 32, 72 and 96 teeth are in sequence. The gear with 24 teeth runs at 900 rpm. The speed in rpm of gear with 72 teeth is
  16. A.
    450
    B.
    225
    C.
    2700
    D.
    300

  17. In a carnot engine with an efficiency of 40%, the heat rejected to the sink at 27 C is 60 kJ, then the heat supplied in kJ to the engine by the sources is
  18. A.
    24
    B.
    56
    C.
    100
    D.
    50

  19. In vapour absorption refrigeration machine fluids used are
  20. A.
    freon and lithium bromide
    B.
    water and ammonia
    C.
    brine and sulphur dioxide
    D.
    air and water