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dichroic

1.) How is a earth connected in a transformer, to get 55V to earth in fault conditions
a.) To the star point of the primary winding
b.) To the star point of the secondary winding
c.) To the centre between the winding
d) To the star point of the primary & secondary winding


2.) A mandatory sign has a white picture on a blue background. What is the shape or it
a.) Triangle
b.) Rectangle
c.) Circle
d) Oval

3.) What is the purpose of a choke in a fluorescent fitting
a.) To improve power factor and efficiency
b.) To start at high voltage and improve efficiency
c.) To start at high voltage and limit current
d) To start at high current and limit the voltage

4) A 1kW load is connected to a 230V supply at a power factor of 0.6 the supply current will be
a) 4.34A
b)7.24A
c) 230A
d) 1000A

5) The correct formula associated with power factor is
a) P = VI Cos Ø
b) P = VI S
c) P = V Cos Ø
d) P = I Sin Ø
 
I have the answers i just thought it would be a little light relief.

Dichroic
 

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