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
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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