Principle of Heat Transfer Chemical Engineering Questions - Set 34 - ObjectiveBooks

Principle of Heat Transfer Chemical Engineering Questions - Set 34

Practice Test: Question Set - 34

1. The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.
    (A) Viscosity
    (B) Density
    (C) Thermal conductivity
    (D) Corrosive nature

2. Nusselt number (for forced convection heat transfer) is a function of the __________ number.
    (A) Prandtl
    (B) Reynolds
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

3. In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
    (A) Nucleate
    (B) Pool
    (C) Low pressure
    (D) None of these

4. The separation of liquid droplets from the vapor is done by a/an __________, in the evaporators.
    (A) Steam ejector
    (B) Entrainment separator
    (C) Compressor
    (D) Vacuum pump

5. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
    (A) 3
    (B) 0.33
    (C) 1
    (D) 1.33

6. A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because
    (A) Total heat transfer area of all the effects is -less than that in a single effect evaporator system
    (B) Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect
    (C) Boiling point elevation in a single effect system is much higher than that in any effect in a multi-effect system
    (D) Heat transfer co-efficient in a single effect is much lower than that in any effect in a multi-effect system

7. In a boiling curve, the peak heat flux is called the __________ point.
    (A) Nusselt
    (B) Leidenfrost
    (C) Boiling
    (D) Burnout

8. Film condensation is promoted on a/an __________ surface.
    (A) Oily
    (B) Coated
    (C) Clean & smooth
    (D) Dirty

9. The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins.
    (A) More
    (B) Less
    (C) Same
    (D) Unpredictable

10. The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body).
    (A) αT
    (B) α × 1/T
    (C) α T4
    (D) Independent of T

11. In a 1-1 concurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is
    (B) 0
    (C) Equal to the difference between hot and cold fluids inlet temperature
    (D) Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature

12. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
    (A) 2f
    (B) f
    (C) f/2
    (D) f/4

13. Grashoff number, which is defined as g . β (Ts - T) ρ2. L32, is proportional to the ratio of buoyancy force to __________ force.
    (A) Viscous
    (B) Elastic
    (C) Inertial
    (D) None of these

14. In forced circulation, the heating element is injected
    (A) Internally
    (B) Externally
    (C) Both (a) and (a)
    (D) Neither (a) nor (b)

15. 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) Hyperbolic
    (B) Parabolic
    (C) Linear
    (D) Logarithmic

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