A company has power factor of 0.6. Determine the power capacitor rating for improving the power factor to 0.95.
See Answer →Define real power, apparent power and power factor.
See Answer →Classify the energy conservation measures applicable in steel industry.
See Answer →A co-generation plant installation is expected to reduce a company’s annual energy bill by Rs.24 lakhs. If the capital cost of the new cogeneration installation is Rs.90 lakhs and the annual maintenance and operating costs are Rs. 6 lakhs, what will be the expected payback period for the project?
See Answer →Explain the working principle of thermocouples.
See Answer →Explain the utility and features of the energy audit equipment used for the measurement of electrical parameters.
See Answer →How do an Industry, nation and globe would benefit from energy efficiency programmes?
See Answer →Energy conservation and energy efficiency are separate but related concepts. Discuss the statement.
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Describe the energy conservation opportunities for residential and commercial application.
See Answer →The equation of transverse wave on a rope is
where y and x are measured in cm and t is expressed in second. Calculate the maximum speed of a particle on the rope.
See Answer →For a damped harmonic oscillation, the equation of motion is
Calculate (i) the period of motion, (ii) number of oscillations in which its amplitude will become half of its initial value, and (iii) the number of oscillations in which its mechanical energy will drop to half of its initial value.
A simple harmonic oscillator has amplitude 15 cm and it completes 100 oscillations in 50 s. (i) Calculate its time period and angular frequency. (ii) If the initial phase is
π/2, write expressions for its displacement and velocity. (iii) Calculate the values of maximum velocity and acceleration.
See Answer →The planet Jupiter has an elliptical orbit e =.05 and a semi major axis of 7.8×10¹¹m. Find the energy of the planet and the perihelion and aphelion distances.
See Answer →A proton undergoes a head on elastic collision with a particle of unknown mass Initially at rest and rebounds with 16/25 of its initial kinetic energy. Calculate the ratio of the mass of the unknown particle with respect to the mass of the proton.
See Answer →A solid cylinder of mass 3.0 kg and radius 1.0 m is rotating about its axis with a speed of 40 rad s¹. Calculate the torque which must be applied to bring it to rest in 10s. What would be the power required?
See Answer →A small satellite is in a circular orbit around a planet at a distance of 4.0 x 108 m from the centre of the planet. The orbital speed of the satellite is 200 ms. What is the mass of the planet?
See Answer →A block of mass 5.0 kg starts from rest and slides down a surface which corresponds to a quarter of a circle of 3.0 m radius. (i) If the curved surface is smooth, find the speed at the bottom. (ii) If the speed at the bottom is 2.0 ms", calculate the energy dissipated due to friction in the descent. (iii) After the block reaches the horizontal with a speed of 2.0 msit slides to a stop in a distance of 1.5 m. calculate the frictional force acting on the horizontal surface. Take g-10ms-2.
See Answer →ballA ball having a mass of 0.5 kg is moving towards the east with a speed of velocity 6.0 ms". After being hit by a bat it changes its direction and starts moving towards the north with a speed of 5.0 ms". If the time of impact is 0.1 s, calculate the impulse and average force acting on the .
See Answer →A box of mass 10 kg is being pulled on the floor by a mass-less rope with a force of 100 N at an angle of 60o to the horizontal. What is the acceleration of the box if the coefficient of kinetic friction between the floor and the box is µε -0.257 Take g-10 ms.-2
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