In Joule’s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is________________?

Related Mcqs:

Pick out the correct statement ?

A. 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F B. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity C. In unsteady state heat conduction, heat flows in the direction of temperature rise D. In heat transfer by forced convection, Grashoff number is very … Pick out the correct statement ?Read More...

Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?

A. t B. 1/ρ C. 1/A D. All A., B. & C....

Solid angle subtended by the finite surface at the radiating element is_________________?

A. Called the view factor B. Called the angle of vision C. Proportional to the square of the distance between surfaces D. Expressed in terms of radians...

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?

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LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?

A. Parallel B. Mixed C. Counter flow D. Same in either A , B. or C....