Question

21) An office \( 10 \mathrm{~m} \times 5 \mathrm{~m} \) requires an illumination level to 300 lux on thr working plane.It is proposed to use 40 watt fluorescent fittings having a rated output of 2440 each. Utilisation factor is 0.5 and maintanace factor is 0.8 . Find no. of lamps required a) 12 b) 14 c) 16 d) 18 22) A work shop measures \( 10 \mathrm{~m} \times 12 \mathrm{~m} \) and is lighted by 20 lamps of 100 W each. Taking maintanance factor of 0.75 , coificient of utilisation 0.6 and luminous efficiency of lamp given on \( 151 \mathrm{~m} / \mathrm{W} \), find the illumination on the working plane. a) \( 122.5 \mathrm{Im} / \mathrm{m}^{2} \) b) \( 112.5 \mathrm{Im} / \mathrm{m}^{2} \) c) \( 102.5 \mathrm{Im} / \mathrm{m}^{2} \) d) \( 132.5 \mathrm{Im} / \mathrm{m}^{2} \) 23) Blinking of fluorescent tube may be on account of a) Low circuit voltage b) Starter fault c) A) or B) d) None of the above 24) If for an IDMT relay with a plug setting of \( 50 \% \) and CT ratio is \( 400 / 5 \) and the fault current is 3000A, then the plug setting multiplier would be a) 7.5 b) 15 c) 18.75 d) 32.5

          21) An office \( 10 \mathrm{~m} \times 5 \mathrm{~m} \) requires an illumination level to 300 lux on thr working plane.It is proposed to use 40 watt fluorescent fittings having a rated output of 2440 each. Utilisation factor is 0.5 and maintanace factor is 0.8 . Find no. of lamps required
a) 12
b) 14
c) 16
d) 18
22) A work shop measures \( 10 \mathrm{~m} \times 12 \mathrm{~m} \) and is lighted by 20 lamps of 100 W each. Taking maintanance factor of 0.75 , coificient of utilisation 0.6 and luminous efficiency of lamp given on \( 151 \mathrm{~m} / \mathrm{W} \), find the illumination on the working plane.
a) \( 122.5 \mathrm{Im} / \mathrm{m}^{2} \)
b) \( 112.5 \mathrm{Im} / \mathrm{m}^{2} \)
c) \( 102.5 \mathrm{Im} / \mathrm{m}^{2} \)
d) \( 132.5 \mathrm{Im} / \mathrm{m}^{2} \)
23) Blinking of fluorescent tube may be on account of
a) Low circuit voltage
b) Starter fault
c) A) or B)
d) None of the above
24) If for an IDMT relay with a plug setting of \( 50 \% \) and CT ratio is \( 400 / 5 \) and the fault current is 3000A, then the plug setting multiplier would be
a) 7.5
b) 15
c) 18.75
d) 32.5

21) An office 10 m× 5 m requires an illumination level to 300 lux on thr working plane.It is proposed to use 40 watt fluorescent fittings having a rated output of 2440 each. Utilisation factor is 0.5 and maintanace factor is 0.8 . Find no. of lamps required
a) 12
b) 14
c) 16
d) 18
22) A work shop measures 10 m× 12 m and is lighted by 20 lamps of 100 W each. Taking maintanance factor of 0.75 , coificient of utilisation 0.6 and luminous efficiency of lamp given on 151 m / W, find the illumination on the working plane.
a) 122.5 Im / m^2
b) 112.5 Im / m^2
c) 102.5 Im / m^2
d) 132.5 Im / m^2
23) Blinking of fluorescent tube may be on account of
a) Low circuit voltage
b) Starter fault
c) A) or B)
d) None of the above
24) If for an IDMT relay with a plug setting of 50 % and CT ratio is 400 / 5 and the fault current is 3000A, then the plug setting multiplier would be
a) 7.5
b) 15
c) 18.75
d) 32.5

Added by Gary G.

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