A. Expansion valve
B. Condenser
C. Refrigerator
D. Compressor
Related Mcqs:
- What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?
A. TR/(T2 – TR) × (T1 – T2)/T1
B. TR/(T2 – TR) × T1/(T1 – T2)
C. TR/(T1 – TR) × (T1 – T2)/T1
D. None of these - 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 - Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?
A. Freon
B. Liquid sulphur dioxide
C. Methyl chloride
D. Ammonia - In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be________________?
A. 5.2
B. 6.2
C. 0.168
D. Data insufficient, can’t be found out - In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?
A. Enhanced COP
B. Decreased COP
C. No change in the value of COP
D. Increased or decreased COP; depending upon the type of refrigerant - The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?
A. Less pronounced
B. More pronounced
C. Equal
D. Data insufficient, can’t be predicted - Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
A. Increased COP
B. Same COP
C. Decreased COP
D. Increased or decreased COP; depending upon the type of refrigerant - The work done in isothermal compression compared to that in adiabatic compression will be__________________?
A. Less
B. More
C. Same
D. More or less depending upon the extent of work done - 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
