AC fast track quiz

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called

• impedance

• reluctance

• inductive reactance

(Refer to Figure 22.) Which illustration is correct concerning bias application and current (positive charge) flow?

• 1

• 2

• 3

(Refer to Figure 24.) Which statement concerning the depicted logic gate is true?

• Any input being 1 will produce a 0 output.

• Any input being 1 will produce a 1 output.

• All inputs must be 1 to produce a 1 output.

The working voltage of a capacitor in an AC circuit should be

• equal to the highest applied voltage.

• at least 20 percent greater than the highest applied voltage.

• at least 50 percent greater than the highest applied voltage.

In an N-P-N transistor application, the solid-state device is turned on when the

• emitter is positive with respect to the base.

• base is negative with respect to the emitter.

• base is positive with respect to the emitter.

(Refer to Figure 26.) Which of the logic gate output conditions is correct with respect to the given inputs?

• 1

• 2

• 3

(Refer to Figure 25.) In a functional and operating circuit, the depicted logic gate's output will be 0

• only when all inputs are 0.

• when all inputs are 1.

• when one or more inputs are 0.

When different rated capacitors are connected in parallel in a circuit, the total capacitance is (Note: C(T) = C(1) + C(2) + C(3) . . .)

• less than the capacitance of the lowest rated capacitor.

• equal to the capacitance of the highest rated capacitor.

• equal to the sum of all the capacitances.

Which requires the most electrical power? (Note: 1 horsepower = 746 watts)

• A. A 1/5-horsepower, 24-volt motor which is 75 percent efficient.

• B. Four 30-watt lamps arranged in a 12-volt parallel circuit.

• C. A 24-volt anticollision light circuit consisting of two light assemblies which require 3 amperes each during operation.

What is the opposition to the flow of AC produced by an electromagnetic field (EMF) with generated back voltage called?

• A. Inductive reactance.

• B. Capacitive reactance.

• C. Mutual inductance.