Recent questions tagged heat transfer rates

+1 vote

1 answer

What is the value of emissivity of a perfect ***** body?

asked Mar 8, 2019 in Class 12 by kratos

+1 vote

1 answer

A radiant heat lamp is a rod, 0.5 m long and 0.5 cm in diameter, through which 400 W of electric energy is deposited.

asked Mar 4, 2019 in Mathematics by kratos

+3 votes

1 answer

A *** of water is boiling on a stove supplying 325 W to the water. What is the rate of mass (kg/*) vaporizing assuming

asked Feb 7, 2019 in Class 12 by kratos

+2 votes

1 answer

Define emissivity of a surface.

asked Jan 24, 2019 in Class 12 by kratos

+2 votes

1 answer

The sun shines on a 150 m2 road surface so it is at 45°C. Below the 5 cm thick asphalt, average conductivity of 0.06 W/m K,

asked Jan 14, 2019 in Mathematics by kratos

+1 vote

1 answer

The sun shines on a 1500 ft^2 road surface so it is at 115 F. Below the 2 inch thick asphalt, average conductivity of 0.035 Btu/h ft F,

asked Jan 2, 2019 in Mathematics by kratos

+2 votes

1 answer

Due to a faulty door contact the small light bulb (25 W) inside a refrigerator is kept on and limited insulation lets 50 W

asked Jan 2, 2019 in Mathematics by kratos

+3 votes

1 answer

The ***** grille on the back of a refrigerator has a surface temperature of 95 F with a total surface area of 10 ft^2.

asked Jan 1, 2019 by kratos

+2 votes

1 answer

The brake shoe and steel drum on a car continuously absorbs 25 W as the car slows down. Assume a total outside surface area

asked Dec 15, 2018 in Mathematics by kratos

+3 votes

1 answer

In the modern era, due to excess stress and faulty life styles, mental problems are on increasing trend.

asked Dec 14, 2018 in Class 12 by kratos

+2 votes

1 answer

A "leaky" capacitor'* faulty insulation allows charge to pass slowly from one plate to the other. Suppose that a charged leaky 2.0 microF

asked Nov 17, 2018 in JEE by kratos

+1 vote

1 answer

A water-heater is covered up with insulation boards over a total surface area of 3 m^2. The inside board surface is at 75°C

asked Oct 22, 2018 in Mathematics by kratos

+2 votes

1 answer

A water-heater is covered up with insulation boards over a total surface area of 30 ft^2. The inside board surface is at 175 F

asked Sep 28, 2018 in Mathematics by kratos

+3 votes

1 answer

A small wire present inside the bulb is called as:

asked Sep 7, 2018 in JEE by kratos

+2 votes

1 answer

A radiant heating lamp has a surface temperature of 1000 K with ε = 0.8. How large a surface area is needed to provide 250 W of radiation

asked Aug 27, 2018 in Physics by kratos

+2 votes

1 answer

For the same steam power plant as, determine the rate of heat transfer in the economizer, which is a low temperature

asked Aug 23, 2018 in Mathematics by kratos

+2 votes

1 answer

A *** of steel, conductivity 50 W/m K, with a 5 mm thick bottom is filled with 15°C liquid water. The *** has a diameter of 20 cm

asked Aug 2, 2018 in Mathematics by kratos

+2 votes

1 answer

A wall surface on a house is at 30°C with an emissivity of ε = 0.7. The surrounding ambient to the house is at 15°C,

asked Jul 26, 2018 in Mathematics by kratos

+1 vote

1 answer

The ***** grille on the back of a refrigerator has a surface temperature of 35°C with a total surface area of 1 m^2.

asked May 20, 2018 in Mathematics by kratos

+3 votes

1 answer

A large condenser (heat exchanger) in a power plant must transfer a total of 100 MW from steam running in a pipe to sea water

asked May 18, 2018 in Mathematics by kratos

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