Home / Mechanical Engineering / Engineering Mechanics :: Section 3

Mechanical Engineering :: Engineering Mechanics

  1. The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.

  2. A.

    Correct

    B.

    Incorrect

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. A smooth cylinder lying on a __________ is in neutral equilibrium.

  4. A.

    curved surface

    B.

    convex surface

    C.

    horizontal surface

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by(where r = Amplitude of motion, and y = Displacement of the particle from mean position.)

  6. A.

    \(\omega\sqrt { y^2 - r^2 }\)

    B.

    \(\omega\sqrt {r^2 - y^2 }\)

    C.

    \(\omega^2\sqrt { y^2 - r^2}\)

    D.

    \( \omega^2\sqrt {r^2 - y^2 }\)

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

  8. A.

    their algebraic sum is zero

    B.

    their lines of action are at equal distances

    C.

    the algebraic sum of their moments about any point in their plane is zero

    D.

    the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. A block ot mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.

  10. A.

    increase

    B.

    decrease

    C.

    not be effected

    View Answer

    Workspace

    Discuss Discuss in Forum