Chemical Heat Transfer

If heat transfer rate varies with the time, it is termed as__________________?

Byadmin March 2, 2019August 24, 2021

If heat transfer rate varies with the time, it is termed as__________________?

A. Forced convection
B. Steady state conduction
C. Monochromatic radiation
D. None of these

Chemical Heat Transfer

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?

A. Lower tube side pressure drop
B. Lower shell side pressure drop
C. Higher tube side heat transfer co-efficient
D. Higher shell side heat transfer co-efficient

Read More The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?
Chemical Heat Transfer

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

A. Parabolic
B. Hyperbolic
C. Linear
D. Logarithmic

Read More If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?
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________________?
Chemical Heat Transfer

Agitated film evaporator is suitable for concentrating _____________ liquids?

Agitated film evaporator is suitable for concentrating _____________ liquids?

A. Foaming
B. Viscous
C. Very thin
D. Corrosive

Read More Agitated film evaporator is suitable for concentrating _____________ liquids?
Chemical Heat Transfer

What is the thermal conductivity of a perfect heat insulator ?

What is the thermal conductivity of a perfect heat insulator ?

A. Zero
B. One
C. ∞
D. Between 0 and ∞

Read More What is the thermal conductivity of a perfect heat insulator ?
Chemical Heat Transfer

‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?

‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?

A. Non-dimensional factor
B. Factor of safety
C. Conversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient
D. None of these

Read More ‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?

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