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Mechanical Engineering :: Engineering Mechanics

  1. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

  2. A.

    area of the triangle

    B.

    twice the area of the triangle

    C.

    half the area of the triangle

    D.

    none of these

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  3. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

  4. A.

    g/2

    B.

    g/3

    C.

    g/4

    D.

    none of these

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  5. Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)

  6. A.

    \(\frac { tan(\alpha + \phi) } {tan\alpha }\)

    B.

    \(\frac {tan\alpha } { tan(\alpha + \phi) }\)

    C.

    \(\frac { tan(\alpha - \phi) } {tan\alpha } \)

    D.

    \(\frac {tan\alpha } { tan(\alpha - \phi) } \)

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  7. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

  8. A.

    Yes

    B.

    No

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  9. Frequency of vibrations means the number of cycles per second.

  10. A.

    Yes

    B.

    No

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