A. Boiling point elevations
B. Temperature of the feed
C. Rate of heat transfer
D. Ratio of the weight of the thin liquor to thick liquor
Related Mcqs:
- A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?
A. Lower heat transfer area
B. Lower steam economy
C. Higher steam economy
D. Higher solute concentration in the product - 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 multieffect
system - Economy of a multiple effect evaporator depends upon the _____________________?
A. Heat balance consideration
B. Rate of heat transfer
C. Both A. and B.
D. Neither A. nor B. - 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 - In a multiple effect evaporator, the effect of boiling point elevation is to______________________?
A. Reduce the capacity
B. Reduce the economy
C. Increase the economy
D. None of these - In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease, depends on the vacuum - Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?
A. C/E
B. E/C
C. CE
D. 1/CE - Economy of an evaporator is influenced by the_____________________?
A. Steam pressure
B. Feed temperature
C. Number of effect
D. Both B. & C. - In a backward feed multiple effect evaporator ___________________ ?
A. Feed is introduced in the first effect
B. Feed flows from low pressure to high pressure
C. No pumps are required between successive effects
D. None of these - A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?
A. Higher economy
B. Lower capacity
C. Both A. & B.
D. Lower economy
