Electrical Engineering Quiz part 2 sa dulo

A straight conductor 100 cm long and carrying a current of 40 A lies perpendicular to a magnetic field of 1.5 Wb/m². What is the mechanical power in watts required to move the conductor at a uniform speed of 6 m/s?

• 300 W

• 330 W

• 360 W

• 390 W

A washing machine is, in effect, an RL circuit. If the machine takes 311 W and 4.5 A from a 115-V source when operating normally, find its power factor.

• 0.70 lagging

• 0.80 lagging

• 0.75 lagging

• 0.60 lagging

An induction motor draws 50 kW at a 0.60 lagging power factor from a 480 V, 60 Hz source. What parallel capacitor will increase the overall power factor to 0.90 lagging?

• 532 μF

• 489 μF

• 704 μF

• 582 μF

When the voltage remains the same, the current will ______ as the impedance decreases.
1. Decrease
2. increase

• Decrease

• 2 only

• Either I or II

• Both

When electrons build up pressure at one point, it is called ________.

• Ganging

• Current flow

• Impedance

• Pressure filing

Which of the following type of fault used only the equivalent positive and negative sequence impedance of the circuit in short-circuit calculation?

• Double line to ground

• Line to line

• Three-phase

• Line to ground

A 69 kV three-phase transposed line is 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 GMR of 0.0243 ft. Find the inductance per phase per kilometer of the line.

• 1.0963 mH/km

• 1.1116 mH/km

• 1.1505 mH/km

• 1.1233 mH/km

Based on the Philippine Distribution Code, all users of the distribution system must maintain a certain power factor at the connection point in order to maintain power quality in the system. What power factor should be maintained at the connection point?

• Not less than 65%

• Not less than 70%

• Not less than 85%

• Not less than 75%

Which of the following is NOT considered in the selection of surge arrester?

• Voltage rating

• Current rating

• Class of Arrester

• Insulation level

A transformer has a primary winding of 2000 turns and voltage of 2400 V and current of 8.66 - j5 with an impedance Z₂ connected across the secondary winding. The secondary winding has 500 turns. What is the value of the secondary impedance?

• 8.66 + j5 ohm

• 26 + j15 ohm

• 15.32 + j10 ohm

• 13 + j7.5 ohm