Progression Test 2

Question 1

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

A. equal to the highest applied voltage.

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

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

Answer 1

C

Question 2

The term that describes the combined resistive forces in an AC circuit is

A. resistance.

B. reactance.

C. impedance.

Answer 2

C

Question 3

The basis for transformer operation in the use of alternating current is mutual

A. inductance.

B. capacitance.

C. reactance.

Answer 3

A

Question 4

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

A. impedance.

B. reluctance.

C. inductive reactance.

Answer 4

C

Question 5

An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?

A. Inductance and frequency.

B. Resistance and voltage.

C. Resistance and capacitive reactance.

Answer 5

A

Question 6

(Refer to Figure 1.) When different rated capacitors are connected in series in a circuit, the total capacitance is

A. less than the capacitance of the lowest rated capacitor.

B. greater than the capacitance of the highest rated capacitor.

C. equal to the sum of all the capacitances.

Answer 6

A

Question 7

Capacitors are sometimes used in DC circuits to

A. counteract inductive reactance at specific locations.

B. smooth out slight pulsations in current/voltage.

C. assist in stepping voltage and current up and/or down.

Answer 7

B

Question 8

In an AC circuit, the effective voltage is

A. equal to the maximum instantaneous voltage.

B. greater than the maximum instantaneous voltage.

C. less than the maximum instantaneous voltage.

Answer 8

C

Question 9

The amount of electricity a capacitor can store is directly proportional to the

A. distance between the plates and inversely proportional to the plate area.

B. plate area and is not affected by the distance between the plates.

C. plate area and inversely proportional to the distance between the plates.

Answer 9

C

Question 10

(Refer to Figure 2.) What is the total capacitance of a circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

A. .170 uF.

B. 0.125 pF.

C. .0125 uF.

Answer 10

C

Question 11

Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be

A. instantaneous values.

B. effective values.

C. maximum values.

Answer 11

B

Question 12

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

A. less than the capacitance of the lowest rated capacitor.

B. equal to the capacitance of the highest rated capacitor.

C. equal to the sum of all the capacitances.

Answer 12

C

Question 13

When inductors are connected in series in a circuit, the total inductance (where the magnetic fields of each inductor do not affect the others) is
(Note: L(T) = L(1) + L(2) + L(3) . . .)

A. less than the inductance of the lowest rated inductor.

B. equal to the inductance of the highest rated inductor.

C. equal to the sum of the individual inductances.

Answer 13

C

Question 14

(Refer to Figure 3.) When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is

A. less than the inductance of the lowest rated inductor.

B. equal to the inductance of the highest rated inductor.

C. equal to the sum of the individual inductances.

Answer 14

A

Question 15

What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively?
(Note: C(T) = C(1) + C(2) + C(3))

A. .4 uF.

B. .04 pF.

C. .04 uF.

Answer 15

A

Question 16

When calculating power in a reactive or inductive AC circuit, the true power is

A. more than the apparent power.

B. less than the apparent power in a reactive circuit and more than the apparent power in an inductive circuit.

C. less than the apparent power.

Answer 16

C

Question 17

(Refer to Figure 5.) What is the impedance of an ac-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms?

A. 22 ohms.

B. 5.29 ohms.

C. 10 ohms.

Answer 17

C

Question 18

Transfer of electric energy from one circuit to another without the aid of electrical connections

A. is called induction.

B. is called capacitance.

C. can cause excessive arcing and heat, and as a result is practical for use only with low voltages/amperages.

Answer 18

A

Question 19

What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?

A. The current is stepped down by a 1 to 4 ratio.

B. The current is stepped up by a 1 to 4 ratio.

C. The current does not change.

Answer 19

A

Question 20

What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

A. .170 uF.

B. 0.125 pF.

C. .0125 uF.

Answer 20

A

Question 21

Convert farads to microfarads by

A. multiplying farads by 10 to the power of 6

B. multiplying picofarads by 10 to the power of 6

C. multiplying microfarads by 10 to the power of 6

Answer 21

A

Question 22

Convert farads to picofarads by:

A. multiplying farads by 10 to the power of 12.

B. multiplying microfarads by 10 to the power of -12.

C. multiplying picofarads by 10 to the power of 12.

Question 23

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.

Answer 23

A

Question 24

Electrostatic fields are also known as

A. dielectric fields.

B. electrostatic fields.

C. static fields.

Answer 24

A