40 TOP ELECTRICAL ENGINEERING Basic Online Test – Multiple Choice Questions and Answers 1. Which of the following power factors results in less energy loss in an RL circuit? 0.2 2 0.4 0.8 2. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by certain constant frequencies certain constant phase angles certain constant currents certain constant voltages 3. With an RL integrator, at the instant of the rising pulse edge, all the input voltage is across the inductor 63 percent of the input voltage is across the resistor all the input voltage is across the resistor 63 percent of the input voltage is across the inductor 4. In a balanced three-phase load, each phase has one-third of total power two-thirds of total power an equal amount of power none of these 5. To increase the current in a series RL circuit, the frequency should be decreased should be increased should be constant cannot be determined without values 6. Referring to Problem 3, the total copper cross section must handle 2.66 A 26.6 mA 1.33 A 266 mA 7. When the frequency is decreased, the impedance of a parallel RL circuit increases remains constant is not a factor decreases 8. If a load is purely inductive and the reactive power is 12 VAR, the apparent power is 0 VA 6 VA 8 VA 12 VA 9. The most common type of ac motor is the single-phase induction motor two-phase induction motor three-phase induction motor two-phase squirrel-cage motor 10. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is 42.4 A 6 A 424 A 4.24 A Loading … Question 1 of 10
