AS112 Practice Quiz #1

Question 1

The potential difference between two conductors which are insulated from each other is measured in

Answer 1

volts.

Question 2

Which is correct in reference to electrical resistance?

Answer 2

If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.

Question 3

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

Answer 3

less than the apparent power.

Question 4

A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be

Answer 4

equal to the voltage across the 20-watt light.

Question 5

How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?

Answer 5

25.23 amperes.

Question 6

How much power must a 24-volt generator furnish to a system which contains the following loads? UNIT RATING One motor (75 percent efficient) 1/5 hp Three position lights 20 watts each One heating element 5 amp One anticollision light 3 amp (Note: 1 horsepower = 746 watts)

Answer 6

450 watts.

Question 7

Which of the following logic gates will provide an active high out only when all inputs are different?

Answer 7

XOR.

Question 8

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

Answer 8

base is negative with respect to the emitter.

Question 9

A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?

Answer 9

10 volts.

Question 10

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

Answer 10

impedance.

Question 11

When referencing resistance in a parallel DC circuit, which of the following statements is true?

Answer 11

The total current is equal to the sum of the currents through the individual branches of the circuit.

Question 12

What is the basic unit of electrical quantity?

Answer 12

Coulomb.

Question 13

Electrostatic fields are also known as

Answer 13

Electrostatic fields.

Question 14

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

Answer 14

inductance.

Question 15

If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit, how much current will flow through the 3-ohm resistor?

Answer 15

0.93 ampere.

Question 16

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

Answer 16

.170 uF.

Question 17

A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?

Answer 17

24 volts.

Question 18

In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?

Answer 18

24 volts.

Question 20

Convert farads to picofarads by:

Answer 20

multiplying farads by 10 to the power of 12.

Question 21

What may result if water is added to a nickel-cadmium battery when it is not fully charged?

Answer 21

Excessive spewing is likely to occur during the charging cycle.

Question 22

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

Answer 22

base is positive with respect to the emitter.

Question 23

Which of these will cause the resistance of a conductor to decrease?

Answer 23

Decrease the length or increase the cross-sectional area.

Question 24

Which is correct in reference to electrical resistance?

Answer 24

If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.

Question 25

In nickel-cadmium batteries, a rise in cell temperature

Answer 25

causes a decrease in internal resistance.

Question 26

A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? (Note: 1 horsepower = 746 watts)

Answer 26

1,000 watts.

Question 27

Diodes are used in electrical power supply circuits primarily as

Answer 27

rectifiers.

Question 28

The voltage drop in a circuit of known resistance is dependent on

Answer 28

the amperage of the circuit

Question 29

Forward biasing of a solid state device will cause the device to

Answer 29

conduct.

Question 30

The purpose of providing a space underneath the plates in a lead acid battery’s cell container is to

Answer 30

prevent sediment buildup from contacting the plates and causing a short circuit.

Question 31

When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

Answer 31

The ground reference.