Related Questions

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
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
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
Domestic refrigerator usually works on the __________ refrigeration cycle.
A Carnot
B Air
C Absorption
D Vapour-ejection
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
A Kinematic viscosity
B Work
C Temperature
D None of these
Which of the following is the result of a reduction in operating pressure in the Air refrigeration cycle?
A decrease in C.O.P.
B always decreases
C increase in C.O.P.
D no change in C.O.P.
The following cycle is used for air craft refrigeration
A Brayton cycle
B Joule cycle
C Carnot cycle
D Reversed Brayton cycle
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.
A More
B Less
C Equally
D Unpredictable
Air refrigeration cycle is used in
A Domestic refrigerators
B Commercial refrigerators
C Air conditioning
D Gas liquefaction

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