Which of the following are true about Solar Thermal Energy Collectors (STEC)? Choose the most appropriate answer from the options given below.

1.The basic unit of a STEC is a solar cell

2.STECs may be flat-plate or concentrating type

3.Temperature in STECs may rise over a thousand degrees centigrade

4.STECs can produce electricity

5.The paraboloid dish collector is an example of a STEC where temperature can go up to 2000 degrees C

A1 and 4 only

B2, 3, 4 and 5 only ✓ Correct

C1, 2, 3 and 5 only

D1, 2, 3, 4 and 5

Correct answer: (B) 2, 3, 4 and 5 only

Explanation

Solar thermal collectors gather the sun's heat, coming as flat-plate or concentrating types that can reach great temperatures.

Statement 1 is wrong: the basic unit is a collector, since a solar cell belongs to photovoltaic systems.

Statement 2 is right: collectors are built either as flat-plate or as concentrating designs.

Statement 3 is right: concentrating collectors can push temperatures above a thousand degrees.

Statement 4 is right: the high heat can raise steam and generate electricity.

Statement 5 is right: a paraboloid dish collector can reach around two thousand degrees.

Flat-plate collectors suit low-temperature uses like water and space heating.

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