5357 103 Written

Electricity is generated at which voltage?

• 133kV
• 400kV
• 25kV
• 33kV

Which of these is a transmission voltage?

• 66kV
• 33kV
• 25kV
• 133kV

Which of these is not a method for cooling transformers?

• Air
• Oil
• Gas (Sf6)
• Refrigeration

Which of these does not contribute to transformer core losses?

• Hysteresis
• Eddy currents
• Type of core (Core/Shell)
• Copper losses

Back EMF in a winding is caused by?

• Fluctuations in resistance
• Fluctuations in voltage
• Fluctuations in current
• Fluctuations in magnetic fields

Inductive reactance is represented by?

• X
• XC
• XL
• X0

If XL=60Ω and R=80Ω calculate Z?

• 110Ω
• 105Ω
• 115Ω
• 100Ω

A 15kW motor has a power factor of 0.83. What is the value of the apparent power?

• 17kVA
• 18kVA
• 19kVA
• 20kVA

The consumers installation begins where?

• Outgoing terminals of the cutout
• Incoming terminals of the meter
• Incoming terminals of the consumer unit
• Outgoing terminals of the meter

What is the max size fuse now fitted in a domestic cutout?

• 80A
• 40A
• 100A
• 60A