Chapter 2 Practice Test

Question 1

Capacitance increases with:

Answer 1

Larger plate area and less distance between the plates.

Question 2

The current at resonance in a series LC circuit is?

Answer 2

Maximum.

Question 3

A transformer used to step up its input voltage must have.

Answer 3

More turns of wire on its secondary than on its primary.

Question 4

The measure of the opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance.

Answer 4

Reactance.

Question 5

A laminated iron-core transformer has reduced eddy-current losses because.

Answer 5

The laminations are insulated from each other.

Question 6

Inductive reactance.

Answer 6

Applies only to sine waves.

Question 7

One of the main applications of a capacitor is to:

Answer 7

Block DC and pass AC.

Question 8

If the secondary current in a step-down transformer increases, the primary current will.

Answer 8

Increase.

Question 9

In a series RC circuit.

Answer 9

Ic and Ir are in phase.

Question 10

The inductive reactance of an inductor is?

Answer 10

Directly proportional to frequency.

Question 11

A circuit that is used to determine the value of an unknown resistance. This type of circuit is generally drawn in a diamond-like arrangement.

Answer 11

Wheatstone bridge.

Question 12

The output frequency is determined by the resonant frequency of the piezoelectric crystal in the oscillator:

Answer 12

Crystal-controlled oscillator.

Question 13

The only type of coupling the can amplify DC voltages as well as AC signals.

Answer 13

Direct coupling.

Question 14

What does the power factor equal in an R-L circuit having a 45 degree phase angle between the voltage and the current?

Answer 14

.707

Question 15

The unit of capacitive reactance is:

Answer 15

Ohm.

Question 16

A ______ is two inductors separated by a core.

Answer 16

Transformer.

Question 17

What is the description of a square wave?

Answer 17

A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time.

Question 18

AC generators used on heavy aircraft provide three-phase power at a frequency of ________Hz.

Answer 18

400.

Question 19

For a sine wave, one-half cycle is often called:

Answer 19

Alternation.

Question 20

In a series circuit, the individual resistor voltage drops are:

Answer 20

Proportional to the series resistance values.

Question 21

Windings arranged in the shape of a triangle:

Answer 21

Delta Wound.

Question 22

The impedance of a series LC circuit at resonance is?

Answer 22

Minimum.

Question 23

A function expressing a relationship between variable input(s) to a system device and the resultant output.

Answer 23

Logic function.

Question 24

What is the term for the out of phase power associated with inductors and capacitors?

Answer 24

Reactive power.