EE 7

Which of the following is not included in the evaluation of the Technical Performance of a Distribution System according to Philippine Distribution Code (PDC)?

• Power Quality

• System Efficiency

• Reliability

• Collecting Efficiency

The deviation for voice FM signals is usually:

• Plus-or-minus 3 kHz

• Plus-or-minus 10 kHz

• Plus-or-minus 6 kHz

• Plus-or-minus 5 kHz

Charge Q is distributed uniformly throughout a spherical insulating shell. The net electric flux in N·m²/C through the outer surface of the shell is:

• Q/ε₀

• Q/4ε₀

• 0

• 2Q/ε₀

The power generated by a machine increases ________ percent from single phase to two-phase.

• 40.4

• 42.4

• 43.4

• 41.4

What is the least prevalent shunt fault among transmission and distribution lines?

• LG

• LL

• LLL

• LLG

What determines the synchronous speed of an AC machine?

• Supply voltage

• Load on the machine

• Number of poles and supply frequency

• Rotor resistance

It is defined as the total number of sustained Customer power interruption 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 Duration Index

• Customer Average Interruption Frequency Index

Transmission efficiency increases as:

• Voltage and power factor both increase

• Voltage increases but power factor decreases

• Voltage decreases but power factor increases

• Voltage and power factor both decrease

The p.f. of an R-C circuit is ________.

• between zero and -1

• often zero

• between zero and 1

• always unity

For proper parallel operation, ac polyphase alternators must have the same ________.

• speed

• voltage rating

• kVA rating

• excitation