Professional Electrical Engineering Quiz 4 part 2

Which is not a characteristic of an ideal transformer?

• finite permeability

• Infinite permeability

• No losses

• No leakage flux

Two capacitors in series are charged across a 24 V source. If C₁ is 12 picofarads, and the voltage across it is 6 V, find C₂.

• 6 pF

• 8 pF

• 2 pF

• 4 pF

Two million cubic meters of water is stored in a reservoir feeding a water turbine. If the center of mass of that volume of water is 50 m above the turbine and losses are negligible, how much power in MWHR per second will that volume of water produce? The density of water is 993 kg/m³.

• 135

• 253

• 271

• 293

A three-phase, wye connected, 20 MW load of power factor 0.866 lagging is to be supplied by a transmission line at 138 kV. It is desired that the line losses not exceed 5 percent of the load. If the per phase resistance of the line is 0.7 Ω/km, what is the maximum length of the line?

• 51 km

• 42 km

• 63 km

• 56 km

Based on the Philippine Distribution Code (PDC), the Distributor may establish penalties for Users whose power factors are less than

• 90%

• 85%

• 80%

• 75%

It is defined as the total number of sustained Customer power Interruptions within a given period divided by the total number of Customers served within the same period.

• System Average Interruption Frequency Index

• System Average Interruption Duration Index

• Customer Average Interruption Frequency Index

• Customer Average Interruption Duration Index

How many 240 V, 20 A branch circuits are required to supply 63,000 VA load?

• 13

• 14

• 15

• 12

What effect on current flow does reversing the direction of movement of a conductor in the magnetic field of a generator have?

• It neutralizes the current flow

• Has no effect on current

• It reverses the direction of current flow

• None of these

Receptacle outlet in a dwelling unit must be installed no more than ______ mm above the floor.

• 1,700

• 1,800

• 3,700

• 1,600

The depletion region of a junction diode forms the ______ of the capacitor.

• Plates

• Dielectric

• Package

• None of these