Related Questions

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
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
Air refrigeration cycle is used in the air crafts, because of
A Low temperature encountered at high altitude
B Its high heat transfer rate
C Its low unit weight per ton of refrigeration
D Its higher co-efficient of performance (COP)
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
A refrigeration cycle is the same as a __________ cycle,
A Turbine
B Heat engine
C Reversed heat engine
D None of these
Air refrigeration cycle is used in
A Domestic refrigerators
B Commercial refrigerators
C Air conditioning
D Gas liquefaction
In aircraft, air refrigeration Cycle is used because of
A Low weight per tonne of refrigeration
B High heat transfer rate
C Low temperature at high altitudes
D Higher coefficient of performance
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.
Air-refrigeration cycle
A Is the most efficient of all refrigeration cycles
B Has very low efficiency
C Requires relatively large quantities of air to achieve a significant amount of refrigeration
D Both B and C

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