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

Heat Transfer
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

26.8

34.4

25

40.5

26.8

34.4

25

40.5

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Heat Transfer
Water always boils when its

Vapour pressure equals 76 cm of Hg

Saturated vapour pressure is less than the atmospheric pressure

Temperature reaches 100° C

Saturated vapour pressure equals the external pressure on its surface

Vapour pressure equals 76 cm of Hg

Saturated vapour pressure is less than the atmospheric pressure

Temperature reaches 100° C

Saturated vapour pressure equals the external pressure on its surface

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Heat Transfer
A graph between __________ is called Wilson plot.

1/U Vs . 1/v0.8

1/v0.8 Vs . U

1/U Vs . 1/V

V0.8 Vs . U

1/U Vs . 1/v0.8

1/v0.8 Vs . U

1/U Vs . 1/V

V0.8 Vs . U

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Heat Transfer
Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

Convective heat transfer co-efficient

Tube side pressure drop and the heat transfer rate

All of these

Effective tube surface area for convective heat transfer

Convective heat transfer co-efficient

Tube side pressure drop and the heat transfer rate

All of these

Effective tube surface area for convective heat transfer

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Heat Transfer
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

four times

twice

square root of

none of the listed here

four times

twice

square root of

none of the listed here

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Heat Transfer
For a perfectly transparent surface (like gases), the

All of these

Reflectivity = 0

Absorptivity = 0

Transmissivity = 1

All of these

Reflectivity = 0

Absorptivity = 0

Transmissivity = 1

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Heat Transfer

Heat Transfer Water always boils when its

Heat Transfer A graph between __________ is called Wilson plot.

Heat Transfer Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

Heat Transfer In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

Heat Transfer For a perfectly transparent surface (like gases), the

Heat Transfer
Water always boils when its

Heat Transfer
A graph between __________ is called Wilson plot.

Heat Transfer
Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

Heat Transfer
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

Heat Transfer
For a perfectly transparent surface (like gases), the