# In a heat exchanger, one transfer unit means___________________?

A. A section of the exchanger in which change in temperature of one stream equals the average
driving force in the section

B. The size of the exchanger in which heat transfer rate is 1 kcal/hr
C. Both A. and B.
D. None of these

# A 2-4 heat exchanger involves__________________?

A. Only counter-flow of fluids
B. Only parallel-flow of fluids
C. Both counter and parallel-flow of the fluids
D. Smaller pressure drop compared to 1-2 exchanger

A. 0.25 D
B. 0.50 D
C. 0.75 D
D. None of these

A. 180
B. 970
C. 3.97
D. None of these

# Baffle spacing ____________________?

A. Is not the same as baffle pitch
B. Should be less than one fifth the diameter of the shell
C. Should be less than the inside diameter of the shell
D. None of these

# The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?

A. ∝ t
B. ∝ 1/t
C. ∝ √t
D. Independent of ‘t’

# 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_________________?

A. Alcohol
B. Distilled water
C. Salt
D. Fruits jam

# 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_________________?

A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equationav
D. None of these

# The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

A. Forced convection
B. Natural convection
C. Transient conduction

# Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?

A. Cube
B. Cylinder
C. Sphere
D. Equal for all the three

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