The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?

Byadmin March 2, 2019August 24, 2021

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?

A. 2
B. 1/2
C. 4
D. 1/4

Chemical Heat Transfer

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?

A. 40
B. 95
C. 70
D. 50

Read More Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?
Chemical Heat Transfer

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?

A. 1000
B. 727
C. 800
D. 1200

Read More The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?
Chemical Heat Transfer

A perfect black body is a perfect _____________ of radiation?

A perfect black body is a perfect _____________ of radiation?

A. Absorber
B. Emitter
C. Both A. & B.
D. Neither A. nor B.

Read More A perfect black body is a perfect _____________ of radiation?
Chemical Heat Transfer

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?

A. C/E
B. E/C
C. CE
D. 1/CE

Read More Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?
Chemical Heat Transfer

Viscous & heat sensitive liquids are concentrated in _____________ evaporators?

Viscous & heat sensitive liquids are concentrated in _____________ evaporators?

A. Open pan
B. Long tube
C. Agitated film
D. None of these

Read More Viscous & heat sensitive liquids are concentrated in _____________ evaporators?
Chemical Heat Transfer

The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?

The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?

A. Low Reynold’s number
B. Very low Grashoff number
C. Molten metals
D. All A., B. and C.

Read More The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?

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