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For the following questions answer them individually
In an electric heater, the metal case is connected to .............
Phase wire
earth wire
neutral wire
none of these
Which of the following is not an indoor lighting ?
Residence light
Office light
Industry light
flood light
Carbon arc lamps are commonly used in .......
Domestic lighting
Street lighting
Cinema projectors
Photography
Lumen/watt is the unit of ............
Light flux
Luminousintensity
Brightness
Luminous efficiency
Arc can be produced by ?
AC current only
DC current only
Either AC or DC current
all options are correct
A rectifier for welding has voltage/current characteristics as ...............
Drooping
Rising
Static
Variable
The insulating material suitable for low temperature applications is ..............
Cork
Diatomaceous earth
Asbestos paper
75 per cent magnesia
The method suitable for heating of conducting medium is .............
Induction heating
Indirect arc heating
Eddy current heating
Radiant heating
The numberof valence electron in boron is ...........
1
2
3
5
The potential barrier acts as a barrier against the flow of. ............
electrons only
holes only
electrons and holes
None of these
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