In a refrigerating machine, if the lower temperature is fixed, then th – McqOptions

MCQOPTIONS

1.	In a refrigerating machine, if the lower temperature is fixed, then the C.O.P of the machine can be increased by
A.	Increasing the higher temperature
B.	Decreasing the higher temperature
C.	Operating the machine at a lower speed
D.	Operating the machine at a higher speed
Answer» C. Operating the machine at a lower speed

Discussion

No Comment Found

Related MCQs

A thermoelectric refrigeration system requires
COP of vapor compression refrigeration system increases with
A refrigerator operates on a reverse Carnot Cycle between 900 K and 300 K. If heat at the rate of 3 kJ/s is extracted from the low-temperature space, then the power required to drive the refrigerator
Heat is absorbed by a refrigerant during a refrigeration cycle in a-
A house-hold refrigerator works on
It is proposed to use a heat pump to heat a home in a cold winter, when the surrounding temperature is -23°C to maintain the room at +22°C. If the power rating of the heat pump is 5 kW, the maximum heat transfer rate that can be provided to the home is
In vapour compression cycle, the refrigerant exists in a superheated vapour state _____.
An inventor claims to have developed a refrigeration unit which maintains – 10°C in the refrigerator which is kept in a room where the surrounding temperature is 25°C and which has COP 8.5. His claim is
A refrigerator is operating on ideal vapour compression cycle with R134a as working fluid atflow rate of 0.1 kg/s Data given are:Enthalpy at the inlet of the compressor = 240 kJ/kgEnthalpy at the outlet of the compressor = 280 kJ/kgEnthalpy at the outlet of the condenser = 100 kJ/kgWhat will be the refrigeration capacity and COP of the refrigerator, respectively?
Determine the COP (coefficient of performance) of a heat pump if the rate of heat rejected is 360 kJ/min and power supplied is 2 kW.