CHAPTER-1.5 ( Illumination )

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CH1.5--------------------TEST-5

Q1. In a house, for which job, the illumination level shall be higher?

1 point

(a) for reading

(b) for sewing

(d) for dressing

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Q2. In the power house, the illumination level is of the order of?

1 point

(a) 30-40 lumens/m2

(b) 100-150 lumens/m2

(d) 300-350 lumens/m2

Option 5

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Q3. High pressure mercury vapour lamp has three pin bayonet cap lamp holder. This is done?

1 point

(a) to make three phase connections

(b) to prevent wrong connections

(d) none of the above

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Q4. In the fluorescent tube circuit one function of the choke is to?

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(a) improve p.f. of the circuit

(b) prevent lamp flicker

(d) prevent unnecessary heating

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Q5. The sodium vapour lamp operates at best efficiency at?

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(a) 200oC

(b) 300 oC

(d) 500 oC

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Q6. The melting point of Tungsten is........oC?

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(a) 2000

(b) 2800

(d) 4400

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Q7. What will be the total flux emitted by a source of 60 candle power?

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(a) 753.6 lumens

(b) 0.001326 lumens

(d) none of these

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Q8. In illumination technology total lumens emitted by source/total lumens available after waste of light is equal to?

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(a) waste light factor

(b) utilization factor

(d) absorption factor

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Q9. The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is?

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(a) 30π

(b) 140

(d) 200

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Q10. Total flux or lumens required in any lighting scheme depends inversely on?

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(a) utilization factor

(b) reduction factor

(d) none of the above

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