PRE-BOARDS EE

Front

Find the inductance per phase per kilometer of a 69 kV three-phase transposed line composed of one ACSR 336,400 cmil, 26/7 Linnet conductor per phase with a horizontal configuration of D12 = 5 ft, D23 = 5 ft, and D13 = 10 ft. The conductors have a diameter of 0.721 inch and a GMR of 0.0243 ft.

Back

1.1116 mH/km

Front

A series circuit consists of three resistors R1, R2, and R3, which are connected to a 240 V source. If the voltage drop across R1 is 60 V when the current is 4 A and R2 = 1.5 R3, what is the ohmic resistance R2?

Back

27 Ω

Front

Which of the following generating plants has the least operating cost? Hydro power plant, Diesel power plant, Steam power plant, Nuclear power plant

Back

Hydro power plant

Front

A 345-kV transmission line has a series impedance of (4 + j60) Ω and a shunt admittance of j2 x 10⁻³ S. Using 100 MVA and the line voltage as base values, calculate the per-unit admittance of the line.

Back

j2.38

Front

Two loads connected in parallel are supplied from a single-phase 240-V rms source. The two loads draw a total real power of 400 kW at a power factor of 0.8 lagging. One of the loads draws 120 kW at a power factor of 0.96 leading. Find the complex power of the other load.

Back

280 + j335 kVA

Front

Which is NOT included in a basic communication circuit? Antenna, Transmitter, Communication channel, Receiver

Back

Antenna

Front

Why is the core loss negligible during a short circuit test conducted on a transformer?

Back

The mutual flux is small

Front

Three resistors of 9 kΩ each are connected in parallel across a 24-V battery with an internal resistance of 1 kΩ. What is the total current of the circuit?

Back

6 mA

Front

Current has units of:______

Back

Coulomb/second

Front

A uniform magnetic field makes an angle of 30° with the z-axis. If the magnetic flux through a 1-m² portion of the xy plane is 5 Wb, then the magnetic flux through a 2-m² of the same plane is ___ Wb.

Back

10