Engineering :: Renewable Sources of Energy

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101.

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

102.

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

103.

Tides are generated primarily by

A.	gravitational attraction between the earth and moon	B.	interaction of winds with the surface of oceans
C.	absorption of solar radiation in the atmosphere	D.	ratation of the earth about its axis and its motion around the sun

104.

Tides arise

A.	once a day	B.	twice a day
C.	thrice a day	D.	four times a day

105.

wave energy

A.	arises because of the interaction of winds with the surface of oceans	B.	available varies with the size and frequency of waves
C.	of about 10 kW is available for every metre of wave front	D.	all of the above

106.

Solar cells convert the sunlight into

A.	electrical energy	B.	mechanical energy
C.	heat energy	D.	chemical energy

107.

Conversion efficiencies for silicon cells range between

A.	10 and 15%	B.	30 and 35%
C.	90 and 95 %	D.	95 to 99%

108.

For silicon the value of the band gap energy is

A.	0.012 eV	B.	0.12 eV
C.	1.2 eV	D.	12 eV

109.

The fill factor (the ratio of the maximum useful power to the ideal power) for a silicon cell may vary from

A.	0.1 to 0.15	B.	0.2 to 0.3
C.	0.35 to 0.5	D.	0.65 to 0.8

110.

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