Related Questions

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always
A [

A.

B. > 1

B 1
C ∞
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is
A 0
B 1
C >1
LMTD can't be used as such without a correction factor for the
A Multipass heat exchanger
B Baffled heat exchanger
C Condensation of mixed vapour in a condenser
D All of the above
For a multipass shell and tube heat exchanger, the LMTD correction factor is always
A 1
B > 1
C Between 1 & 2
LMTD correction factor is used in heat exchanger design for
A Double pipe heat exchanger
B Multipass shell and tube heat exchanger
C Fouling fluids
D Counter flow of hot and cold fluids
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
A Higher
B Lower
C Same
D Depends on the area of heat exchanger
LMTD for counterflow and prallel flow heat exchanger will be the same, when the
A Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
B Outlent temperature of both the hot and cold fluid are same
C Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
D None of these
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
A Minimum
B Maximum
C Zero
D Infinity
Log mean temperature difference (LMTD) cannot be used, if
A Heat transfer co-efficient over the entire heat exchanger is not constant
B There exists an unsteady state
C The heat capacity is not constant and there is a phase change
D None of these
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.
A [

A.

B. > 4

B > 12.5

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