The declination angle has a value of -23.45? on
A.21-Mar
B.22-Sep
C.21-Jun
D.21-Dec
Category: Renewable Sources of Energy Mcqs
The sun exists in a state of equilibrium between the force of gravitation and
A.the outward radiation pressure from fusion reactions
B.the outward force due to nuclear fission
C.the centrifugal force due to its rotation
D.none of the above
At equinoxes the declination angle is
A.0?
B.90?
C.45?
D.30?
The two major consitituents of the sun are
A.helium and hydrogen
B.oxygen and nitrogen
C.helium and carbon dioxide
D.oxygen and hydrogen
The coefficient of performance is defined as
A.the ratio of useful refrigeration to the net work
B.the ratio of net work to the useful refrigeration
C.the drop in temperature achieved
D.the drop in pressure achieved
Suppose that hot water is stored at a temperature that is 25?C higher than room temperature. Water required to store 1 million cal of heat is about
A.40 litre
B.40 kilolitre
C.25 litre
D.2500 litre
The hour angle is an angular measure of time and is equivalent to
A.5? per hour
B.10? per hour
C.15? per hour
D.30? per hour
The adiabatic throttling process
A.is one example of a steady-flow expansion
B.can be performed in a pipe with a restriction
C.of a perfect gas is one of constant enthalpy
D.all of the above
n-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
The diffuse radiation may be assumed to be equivalent to beam radiation coming at an angle of incidence of
A.30?C
B.45?C
C.60?C
D.90?C
