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Electric Illumination - electric traction- Section-2
  1. Melting temperature of tungsten is
    2. A.
    2000°K
    B.
    2500°K
    C.
    2655°K
    D.
    3655°K

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  2. A zero watt lamp consumes
    3. A.
    no power
    B.
    about 5 to 7 W power
    C.
    about 15 to W power
    D.
    about 25 to 30 W power

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  3. The output of a tungsten filament lamp depends on
    4. A.
    size of lamp
    B.
    size of shell
    C.
    temperature of filament
    D.
    all of the above

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  4. Which bulb operates on lowest power ?
    5. A.
    Night bulb
    B.
    Neon bulb
    C.
    GLS bulb
    D.
    Torch bulb

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  5. Which gas is sometimes used in filament lamps ?
    6. A.
    Argon
    B.
    Krypton
    C.
    Nitrogen
    D.
    Carbon dioxide

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  6. Candela is-the unit for
    7. A.
    Light flux
    B.
    Luminous intensity
    C.
    Brightness
    D.
    Luminous efficiency

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  7. Lumen/watt is the unit of
    8. A.
    Light flux
    B.
    Luminous intensity
    C.
    Brightness
    D.
    Luminous efficiency

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  8. Light is produced in electric discharge lamps by
    9. A.
    heating effect of current
    B.
    magnetic effect of current
    C.
    ionization in a gas or vapor
    D.
    carbon electrodes

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  9. The color temperature of day light is around
    10. A.
    50 K
    B.
    160 K
    C.
    600 K
    D.
    6000 K

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  10. Which photometer depends for its operation on Inverse Square Law ?
    11. A.
    Guilds Flicker Photometer
    B.
    Lummer Brodhum Photometer
    C.
    Macbeth llluminometer
    D.
    Trotter Illumination Photometer

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