About Illumination

Following are some of the multiple choice questions on the Illumination with answers that will help the students in developing their knowledge.

Illumination MCQ

1. Filament lamps normally operate at a power factor of

  • Unity
  • 0.8 lagging
  • 0.5 lagging
  • 0.9 lagging

2. The polar curves are used to find out the

  • MHCP
  • MSCP
  • Both (a) and (b)
  • None of these

3. With increase in temperature of the body, the emission of light waves is

  • Increases
  • Decreases
  • Remains same
  • None of these

4. Which gas is sometimes used in filament lamps ?

  • Nitrogen
  • Carbon dioxide
  • Aragon
  • Krypton

5. Lux is the unit of

  • Luminous flux
  • Luminous intensity
  • Illumination
  • Luminance

6. Halo System HTH_THT​ is a type of

  • Recessed fixture
  • Track lighting fixture
  • Bollard fixture
  • Under cabin

7. In 1987 a supernova was observed in a neighboring galaxy. Scientists believed the galaxy was 1.66×10211.66\times10^{21}1.66×1021 m away. How many years prior to the observation did the supernova explosion actually occur?

  • 5.53×103 y5.53\times10^3\ y5.53×103 y
  • 1.75×105 y1.75\times10^5\ y1.75×105 y
  • 5.53×1012 y5.53\times10^{12}\ y5.53×1012 y
  • 1.74×1020 y1.74\times10^{20}\ y1.74×1020 y

8. The illuminance of direct sunlight on Earth is about 1×1051\times10^51×105 lx. A light on a stage has an intensity in a certain direction of 5×1065\times10^65×106 cd. At what distance from the stage does a member of the audience experience an illuminance equal to that of sunlight?

  •  1.4×10−1 m1.4\times10^{-1}\ m1.4×10−1 m  
  •  7 m7\ m7 m  
  •  10 m10\ m10 m  
  •  5×101 m5\times10^1\ m5×101 m  

9. UGR is stands for

  • Unified Glare Rating

10. Define DLOR of lamp

11. Reflection, Refraction and Diffusion comes under ____ characteristics of luminaire

  • Electrical
  • Optical
  • Mechanical
  • Control

12. KTU Course Code for illumination Technology is

  • EE369
  • EE361
  • EE366
  • EE365

13. SHR is

  • Side to Horizontal ratio
  • Space to Horizontal ratio
  • Side to height ratio
  • Space to Height ratio

14. Reduction factor is

  • MSCP/MHCP
  • MHCP/MSCP
  • MHSCP/MSCP
  • MSCP/MHSCP

15. ISI Code for lamp safety requirement is

  • IS 10322
  • IS 10632
  • IS 749
  • IS 3043

16. Average illuminance over a working plane is given by ___(Assume normal notations)

  •  E = N(n.ϕ).MF.UFAE\ =\ \frac{N\left(n.\phi\right).MF.UF}{A}E = AN(n.ϕ).MF.UF​  
  •  E=N.(nϕ).MFA.UFE=\frac{N.\left(n\phi\right).MF}{A.UF}E=A.UFN.(nϕ).MF​  
  •  E=N(n.ϕ).UFA.MFE=\frac{N\left(n.\phi\right).UF}{A.MF}E=A.MFN(n.ϕ).UF​  
  •  E=n.ϕ.MF.UFNAE=\frac{n.\phi.MF.UF}{NA}E=NAn.ϕ.MF.UF​  

17. Room index is

18. Room maintenance factor is the ratio of

  • Illuminance at end of maintenance period to initial illuminance
  • initial illuminance to Illuminance at end of maintenance period
  • Illuminance after maintenance period to initial illuminance
  • Illuminance at end of few lamp failure to initial illuminance

19. Lamp lumen maintenance factor depends on

  • Cleanness of lamp
  • Hours of usage
  • Aging of lamp
  • All the above

20. Diversity in interior lighting is the ratio of

  • Maximum to minimum illuminance
  • Minimum to maximum illuminance
  • Average to maximum illuminance
  • Average to minimum illuminance

21. A light source having an intensity of 1000 candle in all direction is fitted with a reflector so that it directs 75 % of its light flux along a beam having a divergence of 20 degree. What is the total light flux emitted along the beam? What will be the average illumination produced on a surface normal to the beam direction at a distance of 11.5 m?

  • 961.4 lux
  • 323.1 lux
  • 242.0 lux
  • 572.2

22. Rousseau's construction is for finding

  • MHSCP
  • MSCP
  • MHCP
  • MCP

23. Round each number to the nearest 100.956

  • 900
  • 1,000

24. Which UGR is most comfortable

  • 40
  • 25
  • 16
  • 13

25. Round each number to the nearest 100. 129

  • 100
  • 200

26. Round each number to the nearest 100. 67

  • 0
  • 100

27. MHCP is

  • Mean Hemispherical candle power
  • Mean Horizontal candle power
  • Mean horizontal candle point
  • None of the above

28. Dolores saw 22 boa constrictors and 25 rattlesnakes at the San Diego Zoo. How many snakes did she see in all?

  • 47
  • 45

29. A fan hanged below the LED light at a Juice store causes irritation to occupants there, technically it is known as

  • Glare
  • Stroboscopic effect
  • Hard shadow
  • Disability glare

30. Round each number to the nearest 100. 443

  • 400
  • 500

31. Textiles shops uses slightly different colored lamps in there show rooms

  • To please customer
  • To increase glare
  • To avoid glare
  • To improve color rendering

32. One candela is 1/___________ of luminous intensity per centimeter square of black body radiating at _______________ Kelvin temperature

  • 60, 2049

33. Math is...

  • fun :-)
  • the greatest!!

34. Write the number in expanded form. 579

  • 500+70+9
  • 500 + 79

35. Lambert's cosine law is

  • Eθ2 α EmCosθE_{\theta}^2\ \alpha\ \ E_mCos\thetaEθ2​ α Em​Cosθ
  • Eθ α EmCosθE_{\theta}\ \ \alpha\ \ E_mCos\thetaEθ​ α Em​Cosθ
  • Em α EθCosθE_m\ \ \alpha\ \ \ E_{\theta}Cos\thetaEm​ α Eθ​Cosθ
  • Eθ α Cosθ EmE_{\theta}\ \ \alpha\ \frac{\ \ Cos\theta}{\ E_m}Eθ​ α Em​ Cosθ​

36. Write the number in expanded form. 403

  • 400+3
  • 400 + 30

37. If a bright flash light has a light intensity of 25.0 Candela at a distance of 2.00 m from the lens. What is the intensity of the flash light at 75 m away from the lens.

  • 0.0177
  • 35156.25
  • 0.666
  • 937.5

38. Write the number in expanded form. 690

  • 600 + 9
  • 600+90

39. Inverse square law is ____ (Assume normal notations)

  • E2 α 1d2E^2\ \alpha\ \frac{1}{d^2}E2 α d21​
  • I α 1d2I\ \alpha\ \frac{1}{d^2}I α d21​
  • I2 α 1d2I^2\ \alpha\ \frac{1}{d^2}I2 α d21​
  • I2 α d2I^2\ \alpha\ d^2I2 α d2

40. Round each number to the nearest 100. 609

  • 600
  • 700

41. Round each number to the nearest 100. 349

  • 300
  • 400

42. Write with steps and find fixture efficiency of a 120 W incandescent lamps emitting a luminous flux of your roll no. x 500 lumen and then your roll no. x 300 lumens escape out of the fixture. Also write fixture efficacy.

43. Frequency mentioned in definition of 1 Candela is

  • 240 x 10^12 Hz
  • 600 x 10^2 Hz
  • 540 x 10^12 Hz
  • 540 x 10^2 Hz

44. Write the number in expanded form. 742

  • 700+40+2
  • 740 + 2

45. Round each number to the nearest 100. 258

  • 200
  • 300

46. Define one Lux

47. Human eye is most sensitive to ___ with same intensiy

  • Violet region
  • Green region
  • Reg region
  • Equal sensitivity in all light region

48. Round each number to the nearest 10. 7

  • 0
  • 10

49. Direct lighting provide maximum light flux

  • Equal to upward and downwards
  • No such restriction
  • downwards
  • Upwards

50. Round each number to the nearest 10. 236

  • 230
  • 240

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