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For the following questions answer them individually
LED lamp have a general life expectancy of
1000 hrs.
5000 hrs.
15000hrs.
50000 Hrs.
Cutting plier use for electrical work must have
High strength
Insulation
Not corrode
sharp
The unit of luminousfluxis
Steradian
Candela
Lumen
Lux
A zero watt lamp consumes
No power
About 5 to 7 W power
About 15 to 20 W power
About 25 to 30 W power
A DC generator used for AC welding should have ....../
Rising characteristics
Dropping characteristics
Straight characteristics
None of these
The welding electric circuit is ......
Always earthed
Never earthed
Through cables only
Direct resistance heating is used in
Electrode boiler
Salt-bath furnace
Resistance welding
ll option are correct
The main drawbackof resistance welding is
High initial as well as maintenance cost.
Difficult shapes and sections cannot be welded.
Only similar metals can be welded.
The process of adding, impurities to a semiconductor is known as ......
polling
intrusion
pugging
doping
In a p-n junction the potential barrier is due to the charges on either side of the junction. These charges are
majority carriers
minority carriers
Both majority as well as minority carriers
fixed donor and acceptor ions
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