The percent transmission of incoming solar radiation through the top cover plate of flat-plate collectors is typically
A.99
B.85
C.95
D.30
Category: Renewable Sources of Energy Mcqs
In solar ponds the upper convective layer
A.has no useful role in energy collection
B.is caused by wind action and heat transfer
C.is considered a homogeneous low salinity layer
D.all of the above
When light wave passes from air into glass the ray describing the motion of the wave front changes direction according to Snells law of refraction and the light ray
A.is bent toward the normal to the glass surface
B.is bent away from the normal to the glass surface
C.does not bend at all
D.completely reflected at the air-glass interface
In solar ponds the transfer of heat and salt is convective in the where UCL NCL and LCL are upper convective layer nonconvective layer and lower convective layer respectively
A.UCL and LCL
B.UCL and NCL
C.NCL and LCL
D.UCL NCL and LCL
The declination angle is zero on the two equinox days of about
A.March 21 and September 22
B.March 21 and June 21
C.March 21 and July 21
D.June 21 and May 21
Wind energy transferred to the large sea surface is stored in waves as
A.chemical energy
B.thermal energy
C.electrical energy
D.mechanical energy
Which of the following is a vertical axis windmill?
A.Multiblade type
B.Sail type
C.Propeller type
D.Savonius type
The ideal stirling cycle combines
A.two constant pressure processes and two constant volume processes
B.two constant temperature processes and two constant volume processes
C.two constant pressure processes and two constant temperature processes
D.two constant pressure processes and two constant entropy processes
The adiabatic throttling process of a perfect gas is one of constant enthalpy in which
A.there is no drop in temperature
B.there is a reduction in temperature
C.there is an increase in temperature
D.none of the above
Evacuated flat-plate collectors are better than non-evacuated ones at high operating temperatures because
A.convective heat losses from the top cover plate are greatly reduced
B.convective heat losses from the absorber plate are greatly reduced
C.conductive heat losses from the absorber plate are greatly reduced
D.radiative heat losses from the absorber plate are greatly reduced
