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NDA - Work Energy & Power Test 1249
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NDA - Work Energy & Power Test 1249

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  • Question 1/5
    1 / -0.33
    Which of the following is not a unit of power?
    Solutions

    Wh is a unit of energy. 1Wh is the amount of energy consumed in 1 hour when work in done at the rate of 1W.

    kW is a unit of power. 1kW = 103 W.

    1 hp (horsepower) is a unit of power. 1 hp = 746 W

    J/s is a unit of power. 1 J/s = 1 W.

  • Question 2/5
    1 / -0.33
    Fill in the blank-

    If only _________ forces are acting on a body, then its mechanical energy is conserved.

    Solutions

    A conservative force is a force for which the total work done in displacing a particle is independent of the path taken.

    When a body is under the action of a conservative force, the change is its total energy i.e. the sum of kinetic and potential energies is 0.

    Let K be the kinetic energy and U be the potential energy.

    Under the action of conservative force

    ∴ K + U = constant or the mechanical energy remains conserved.

  • Question 3/5
    1 / -0.33
    A stone is released from a tower, its total energy during its fall:
    Solutions

    Sum of the potential and kinetic energy is the total energy which remains constant during its fall.

  • Question 4/5
    1 / -0.33
    If the power of a signal is a finite value and its energy is zero, then it is a _________.
    Solutions

    Power signal: it has infinite length with infinite time.

    Energy signal: it has finite energy with limited time.

    Example: A signal having only one square pulse is energy signal and a signal with infinite length and infinite time like sin signal is called power signal.

  • Question 5/5
    1 / -0.33
    How much mass is converted into energy per day in Tarapur nuclear power plant operated at  KW?
    Solutions

    Here,

    Mass (m) =?

    As

     

    We know that

    Now,

    Then,

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