Related Questions

The formation of frost on cooling coils in a refrigerator
A Increases heat transfer
B Improves C.O.P. of the system
C Increases power consumption
D Reduces power consumption
Frost formation on the evaporator tubes in the domestic refrigerators
A Can be prevented by proper design
B Decreased compressor power
C Causes heat loss due to poor heat transfer
D Is immaterial
One fourth the price of a TV is equal to 1/6th the price of a refrigerator. If the total cost of the TV and the refrigerator is Tk 60000, what is the price of the TV?
A Tk 22000
B Tk 24000
C Tk 27500
D None of these
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
A Small
B High
C Equal
D Anything
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to
A Collect liquid refrigerant and prevent it from going to compressor
B Detect liquid in vapour
C Superheat the vapour
D Collect vapours
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
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
A Same
B More
C Less
D More or less depending on ambient conditions
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 multieffect system
D Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
A Increases
B Decreases
C Remains constant
D May increase or decrease, depends on the vacuum

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