GATE 2023 AR — Architecture – Question 61

Building Services · Principles of electrification and illumination and special lighting for buildings · 2 marks · Multiple choice

Match P goniophotometer, Q pyrheliometer, R spectrophotometer, S forward-looking infrared instrument with 1 spectral response at specific wavelengths, 2 luminous-flux distribution, 3 direct solar radiation, 4 temperature distribution, 5 global solar radiation.

P–5; Q–2; R–1; S–3
P–2; Q–3; R–1; S–4
P–2; Q–3; R–1; S–5
P–5; Q–1; R–2; S–4

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Correct answer: (B) P–2; Q–3; R–1; S–4

Explanation

A goniophotometer measures angular light distribution (2); a pyrheliometer measures direct-beam solar radiation (3); a spectrophotometer measures wavelength-dependent response (1); infrared imaging maps apparent surface temperatures (4). Thus B. Global radiation is normally measured with a pyranometer, not a pyrheliometer.

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