Related Questions

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
A Is as light as possible
B Has very high C.O.P
C Employs minimum quantity of refrigerant
D Consumer minimum horse power
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
A Vapor compression cycle using expansion valve
B Air refrigeration cycle
C Vapor compression cycle using expansion engine
D Carnot refrigeration cycle
15- year-old Anurudh Ganesan has invented a _portable_ refrigeration system that enables doctors to transport vaccines safely and effectively. A synonym of the underlined word is :
A mobile
B molecular
C potential
D mortal
Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
A Positive
B Negative
C Zero
D Infinity
One Ton of Refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice---
A In 1 hour
B In 24 hour
C In 10 minutes
D In 12 hour
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
A Quantity & temperature of waste gas
B Dust concentration & nature of dust in waste gas
C Corrosive nature of the waste gas
D All of the above
In a refrigeration system, heat absorbed in comparison to heat rejected is
A More
B Less
C Same
D More for small capacity and less for high capacity
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor

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