A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

0.55

0.15

555

55.5

0.55

0.15

555

55.5

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Heat Transfer
Value of Prandtl number for water ranges from

L to 2

1000 to 2000

100 to 500

5 to 10

L to 2

1000 to 2000

100 to 500

5 to 10

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Heat Transfer
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

regenerator

heat exchanger

recuperator

boiler

regenerator

heat exchanger

recuperator

boiler

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Heat Transfer
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Parallel flow with process stream on tube side

Counter flow with process stream on shell side

Counter flow with process stream on tube side

Parallel flow with process stream on shell side

Parallel flow with process stream on tube side

Counter flow with process stream on shell side

Counter flow with process stream on tube side

Parallel flow with process stream on shell side

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Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

U-tube

Floating head

Fixed tube

Double pipe

U-tube

Floating head

Fixed tube

Double pipe

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Heat Transfer
Which of the following has maximum thermal conductivity?

Coal

Iron

Nitrogen

Tar

Coal

Iron

Nitrogen

Tar

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Heat Transfer

Heat Transfer Value of Prandtl number for water ranges from

Heat Transfer An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Heat Transfer A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Heat Transfer __________ heat exchanger is used for chilling oil to be dewaxed.

Heat Transfer Which of the following has maximum thermal conductivity?

Heat Transfer
Value of Prandtl number for water ranges from

Heat Transfer
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Heat Transfer
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

Heat Transfer
Which of the following has maximum thermal conductivity?