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

40.5

25

34.4

26.8

40.5

25

34.4

26.8

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Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Initially decreases and remains constant thereafter

More than 45°C

Less than 45°C

Equal to 45°C

Initially decreases and remains constant thereafter

More than 45°C

Less than 45°C

Equal to 45°C

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Pool

Local

Saturated

Nucleate

Pool

Local

Saturated

Nucleate

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Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

> 1

∞

1

< 1

> 1

∞

1

< 1

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Heat Transfer
The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid

Decrease in heat exchanger efficiency

Its evaporation loss

Excessive corrosion

Uneconomic LMTD

Decrease in heat exchanger efficiency

Its evaporation loss

Excessive corrosion

Uneconomic LMTD

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Heat Transfer
In the equation Q = UAΔt; Δt is

Logarithmic mean temperature difference

The difference of average bulk temperatures of hot and cold fluids

Geometric mean temperature difference

Arithmetic mean temperature difference

Logarithmic mean temperature difference

The difference of average bulk temperatures of hot and cold fluids

Geometric mean temperature difference

Arithmetic mean temperature difference

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Heat Transfer

Heat Transfer In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Heat Transfer In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Heat Transfer In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

Heat Transfer The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid

Heat Transfer In the equation Q = UAΔt; Δt is

Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

Heat Transfer
The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid

Heat Transfer
In the equation Q = UAΔt; Δt is