A pyrheliometer is an instrument which measures
A.beam radiation
B.diffuse radiation
C.global radiation
D.duration of bright sunshine
Category: Renewable Sources of Energy Mcqs
p-type silicon is formed by adding a minute amounts of elements with
A.three valence electrons
B.four valence electrons
C.five valence electrons
D.six valence electrons
Solar cells convert the sunlight into
A.electrical energy
B.mechanical energy
C.heat energy
D.chemical energy
For zenith angles from 0? to 70? at sea level air mass m is given by where ?z is zenith angle
A.m = cos ?z
B.m = 1/cos ?z
C.m = sin ?z
D.m = 1/sin ?z
Slelective surfaces
A.maximize the absorption of solar energy and emission of radiative loss
B.manimize the absorption of solar energy and emission of radiative loss
C.Maximize the absorption of solar energy and minimize emission of radiative loss
D.minimize the absorption of solar energy and maximize emission of radiative loss
Which of the following passes through a maximum with increase in the number of covers (glazings) used in a flat-plate solar collector?
A.Transmissivity – absorptivity product
B.Top loss coefficient
C.Collector efficiency
D.Heat loss from the top cover
Which of the following angles is aero at solar noon?
A.Solar altitude angle
B.Solar zenith angle
C.Hour angle
D.Latitude angle
Which of the following decreases during adiabatic throttling of a perfect gas?
A.Temperature
B.Enthalpy
C.Entropy
D.pressure
Compared to the combined melting-vaporization process sublimation occurs at
A.higher pressures
B.lower pressures
C.same pressure
D.none of the above
Sun radiates energy to the earth
A.in the form of electromagnetic radiation
B.at a relatively constant rate of 3.83 x 1026 W
C.24 hours per day 365 day of the year
D.all of the above
