17.

The circuit component that has the property of opposing a change of

applied voltage is the

a.

rheostat.

c.

capacitor.

b.

inductor.

d.

potentiometer.

18.

The amount of ac flowing in a capacitive circuit can be measured with

an ac ammeter. Yet, the dielectric in a capacitor insulates against current flow.

The apparent current flow read by the ammeter is due to

a.

development of a counter EMF.

b.

current leaking through the dielectric.

c.

changing polarity across the capacitor.

d.

ability of the capacitor to oppose any change in current.

19.

In a circuit containing resistor, inductors, and capacitors the total

opposition to ac is termed

a.

c.

resistance.

b.

inductive reactance.

d.

impedance.

20.

The impedance of a circuit can be represented by the hypotenuse of a

right triangle where the other two sides represent reactance and resistance. The

significance of this representation is to show that in any circuit the impedance is

greater than

a.

reactance hut smaller than resistance.

b.

resistance but smaller than reactance.

c.

the sum of resistance and reactance.

d.

either resistance or reactance.

21.

Resonance may be achieved in an LC circuit by changing any one of three

factors. The factor that will NOT affect resonance is

a.

c.

b.

resistance.

d.

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