A. Ratio of true temperature difference to the LMTD
B. Ratio of LMTD to the true temperature difference
C. Differenced of true temperature difference and the LMTD
D. Geometric mean of the true temperature difference and the LMTD
Related Mcqs:
- 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 - It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than _________________?
A. 0.99
B. 0.95
C. 0.80
D. 0.55 - With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________?
A. Decreases very rapidly
B. Increases very rapidly
C. Remains constant
D. Increases linearly - Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?
A. 5-10
B. 15-20
C. 30-35
D. 35-40 - The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?
A. S1/S2
B. S1.S2
C. S2/S1
D. 1/S1.S2 - Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the___________________?
A. Ultimate stress to breaking stress
B. Ultimate stress to working stress
C. Working stress to ultimate stress
D. None of these - The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?
A. Working
B. Damaging
C. Allowable
D. None of these - Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?
A. Increases capacity
B. Increases economy
C. Does not affect the capacity
D. Both B. & C. - In a shell and tube heat exchanger, the ‘tube pitch’ is defined as the _____________________?
A. O.D. of the tube for square pitch
B. Shortest distance between two adjacent tube holes
C. Shortest centre to centre distance between adjacent tubes
D. None of these - ____________ is the determining factor for the number of bubble caps to be used per tray?
A. Permissible slot velocity
B. Tray diameter
C. Liquid load
D. Vapor load
