If ? is the angle between an incident beam of flux Ibn and the normal to a plane surface then the equivalent flux falling normal to the surface is
A.Ibn sin ?
B.Ibn cos ?
C.Ibn sec ?
D.Ibn
Category: Renewable Sources of Energy Mcqs
For a solar pond with a 1.5 m thick lower convective layer and 1.5 m nonconvective layer the amount of sodium chloride required is about
A.700 kg m-2
B.7000 kg m-2
C.70000 kg m-2
D.70 kg m-2
Biot number signifies
A.the ratio of heat conducted to heat convected
B.the ratio of heat convected to heat conducted
C.the ratio of external convective resistance to internal conductive resistance
D.none of the above
At equinoxes
A.the declination angle is zero
B.the time during which the sun is visible is 12 hours
C.the time during which the sun is not visible is 12 hours
D.all of the above
Winds are caused
A.because of the absorption of solar radiation on the earths surface and in the atmosphere
B.because of the rotation of the earth about its axis and its motion around the sun
C.both a and b
D.neither a nor b
Compared to air helium is preferred for solar Brayton cycles because
A.of higher cycle efficiency
B.it has high heat transfer capability
C.it is inert
D.all of the above
Which of the following is not a good way to provide freeze protection for a flat-plate collector system?
A.Use of movable insulation to cover the collector
B.Drain the collector when it is not operating during periods of low ambient temperatures
C.Circulate an antifreeze solution rather than water
D.Increase the rate of water flow through the collector by a factor of 2 leaving it on at all times
The wavelength of which of the following is the largest?
A.Radio waves
B.Light waves
C.X-ray waves
D.Gamma ray waves
As the temperature of a hot glowing object increases the wavelength at the maximum of the blackbody radiation curve
A.increases
B.decreases
C.remains the same
D.increases linearly
