In any practical refrigeration system the maintenance of low temperature and the discharge of this heat at
A.higher temperature
B.lower temperature
C.same temperature
D.none of the above
Category: Renewable Sources of Energy Mcqs
The index of performance of a refrigerating system is called
A.efficiency
B.effectiveness
C.coefficient of performance
D.drop in temperature
Conversion efficiencies for silicon cells range between
A.10 and 15%
B.30 and 35%
C.90 and 95 %
D.95 to 99%
The angle subtended by a vertical line to the zenith (i.e. the point direct5ly overhead) and the line of sight to the sun is called
A.zenth angle
B.declination angle
C.hour angle
D.iatitude angle
The Carnot heat engine
A.receives energy at a high level of temperature
B.converts a portion of the energy received into work
C.discharges portion of the energy received to a heat sink at a low level of temperature
D.all of the above
In solar ponds operating in a sunny climate salt (sodium chloride) is transported from noncenvective layer into upper convective layer at a rate of the order of
A.40 kg m-2 year-1
B.40 kg m-2 month-1
C.40 kg m-2 day-1
D.40 kg m-2 hour-1
At solar noon on the equinoxes the solar zenith angle is equal to
A.the latitude angle
B.the hour angle
C.the solar altitude angle
D.none of the above
