Q.1
Filament lamps normally operate at a power factor of
  • Unity
  • 0.8 lagging
  • 0.5 lagging
  • 0.9 lagging
Q.2
The polar curves are used to find out the
  • MHCP
  • MSCP
  • Both (a) and (b)
  • None of these
Q.3
With increase in temperature of the body, the emission of light waves is
  • Increases
  • Decreases
  • Remains same
  • None of these
Q.4
Which gas is sometimes used in filament lamps ?
  • Nitrogen
  • Carbon dioxide
  • Aragon
  • Krypton
Q.5
Lux is the unit of
  • Luminous flux
  • Luminous intensity
  • Illumination
  • Luminance
Q.6
Halo System HTH_THT​ is a type of
  • Recessed fixture
  • Track lighting fixture
  • Bollard fixture
  • Under cabin
Q.7
Ina supernova was observed in a neighboring galaxy. Scientists believed the galaxy was 1.66×10211.66\times10^{21}1.66×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
Q.8
The illuminance of direct sunlight on Earth is about 1×1051\times10^51×lx. A light on a stage has an intensity in a certain direction of 5×1065\times10^65×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
Q.9
UGR is stands for
  • Unified Glare Rating
Q.10
Reflection, Refraction and Diffusion comes under ____ characteristics of luminaire
  • Electrical
  • Optical
  • Mechanical
  • Control
Q.11
KTU Course Code for illumination Technology is
  • EE369
  • EE361
  • EE366
  • EE365
Q.12
SHR is
  • Side to Horizontal ratio
  • Space to Horizontal ratio
  • Side to height ratio
  • Space to Height ratio
Q.13
Reduction factor is
  • MSCP/MHCP
  • MHCP/MSCP
  • MHSCP/MSCP
  • MSCP/MHSCP
Q.14
ISI Code for lamp safety requirement is
  • IS 10322
  • IS 10632
  • IS 749
  • IS 3043
Q.15
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​
Q.16
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
Q.17
Lamp lumen maintenance factor depends on
  • Cleanness of lamp
  • Hours of usage
  • Aging of lamp
  • All the above
Q.18
Diversity in interior lighting is the ratio of
  • Maximum to minimum illuminance
  • Minimum to maximum illuminance
  • Average to maximum illuminance
  • Average to minimum illuminance
Q.19
A light source having an intensity ofcandle in all direction is fitted with a reflector so that it directs% of its light flux along a beam having a divergence ofdegree. 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
Q.20
Rousseau's construction is for finding
  • MHSCP
  • MSCP
  • MHCP
  • MCP
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