Unit-8 Maintaining Lighting System

What does ELV stand for in relation to FELV, PELV or SELV equipment.

   

• Extra lighting voltages

• Electro Lighting Voltage

• Extra Low Voltage

• Enhanced Low Voltage

Which metals is commonly used as a filament in an Incandescent Lamp.       

• Mercury

• Copper

•   Sodium

• Tungsten

Recognize the name of parts 1 and 2  

• Stem and electrode

• Stem and Cap

• Cap and Resistor

• None of the above

Identify the part of the Sodium Lamp, labelled C.

• Electrode

• Arc tube

• Glass Envelope

• Mercury and Argon gas filing

Which lamp has electrons migrating through gas while energy change mercury from liquid to gas  

• High Pressure Sodium

• Fluorescent

• LED

• Incandescent

Find the part name 3 and 4?

     

• Cap and electrode

• Stem and resistor

• Resistor and starting electrode.

• None of the above

When installing wiring to the latest standards recommended by the IET/ICEL (supporting BS7671), what color should be used for the neutral line. 

• Yellow

•   Grey

• Red

• Blue

Name the parts 5 and 6 from the picture

•    Top support and stem

•   Fluorescent coating and top support

• Cap and end support

• None of the above

Which of these is genuine factor that effects light levels in installation over period of time.     

•   The supply current

•   Number of luminaires in the system

• Dirt on the light reflecting surfaces.

• The supply voltage

What is the ratio of low energy lamps recommended by regulations for internal fittings.  

• All the fittings

•   One of every four

• Three of every four

• Two of every five