Basic Electricity

Question 1

If electrolyte from a lead acid battery is spilled in the battery compartment, which procedure should be followed?

A. Apply boric acid solution to the affected area followed by a water rinse
B. Rinse the affected area thoroughly with clean water
C. Apply sodium bicarbonate solution to the affected area followed by a water rinse

Answer 1

C. Apply sodium bicarbonate solution to the affected area followed by a water rinse

Question 2

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

A. Base is negative with respect to the emitter
B. Base is positive with respect to the emitter
C. Emitter is negative with respect to the base

Answer 2

A. Base is negative with respect to the emitter

Question 3

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

A. Emitter is positive with respect to the base
B. Base is negative with respect to the emitter
C. Base is positive with respect to the emitter

Answer 3

C. Base is positive with respect to the emitter

Question 4

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

A. The circuit breaker
B. The ground reference
C. The switch

Answer 4

B. The ground reference

Question 5

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

A. Conduct via zener breakdown
B. Conduct
C. Turn off

Answer 5

B. Conduct

Question 6

Typical application for zener diodes is as:

A. Full-wave rectifiers
B. Half-wave rectifiers
C. Voltage regulators

Answer 6

C. Voltage regulators

Question 7

A lead acid battery with 12 cells connected in series (no load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2 ohms resistance. The internal resistance of the battery is:

A. 0.52 ohm
B. 2.52 ohms
C. 5.0 ohms

Answer 7

A. 0.52 ohms

Question 8

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 8

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

Question 9

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 9

B. Effective values

Question 10

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 10

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

Question 11

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 11

C. Less than the maximum instantaneous voltage

Question 12

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 12

A. Inductance and frequency

Question 13

A thermal switch or thermal protector, as used in an electric motor, is designed to:

A. Close the integral fan circuit to allow cooling of the motor
B. Open the circuit in order to allow cooling of the motor
C. Reroute the circuit to ground

Answer 13

B. Open the circuit in order to allow cooling of the motor

Question 14

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

A. Resistance
B. Reactance
C. Impedance

Answer 14

C. Impedance

Question 15

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

A. The voltage of the circuit
B. Only the resistance of the conductor, and does not change with a change in either voltage or amperage
C. The amperage of the circuit

Answer 15

C. The amperage of the circuit

Question 16

A fully charged lead acid battery will not freeze until extremely low temperatures are reached because:

A. The acid is in the plates, thereby increasing the specific gravity of the solution
B. Most of the acid is in the solution
C. Increased internal resistance generates sufficient heat to prevent freezing

Answer 16

B. Most of the acid is in the solution

Question 17

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

A. Inductance
B. Capacitance
C. Reactance

Answer 17

A. Inductance

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/amperage

Answer 18

A. Is called induction

Question 19

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

A. Four 30-watt lamps arranged in a 12-volt parallel circuit
B. A 1/5 horsepower, 24-volt motor which is 75% efficient
C. A 24-volt anti collision light circuit consisting of two light assemblies which require 3 amperes each during operation

Answer 19

B. A 1/5 horsepower, 24-volt motor which is 75% efficient

Question 20

The correct way to connect a test voltmeter in a circuit is:

A. In series with a unit
B. Between the source voltage and the load
C. In parallel with a unit

Answer 20

C. In parallel with a unit

Question 21

Which of the following are commonly used as rectifiers in electrical circuits?

A. Anodes
B. Cathodes
C. Diodes

Answer 21

C. Diodes

Question 22

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?

A. 9.3 amperes
B. 1.05 amperes
C. 0.93 ampere

Answer 22

C. 0.93 ampere

Question 23

What unit is used to express electrical power?

A. Volt
B. Watt
C. Ampere

Answer 23

B. Watt

Question 24

What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?

A. 1.07 ohms
B. 26 ohms
C. 0.93 ohm

Answer 24

B. 26 ohms

Question 25

Which statement regarding the hydrometer reading of a lead acid storage battery electrolyte is true?

A. The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 degrees F
B. A specific gravity correction should be added to the hydrometer reading if the electrolyte temperature is below 59 degrees F
C. The hydrometer reading will give a true indication of the capacity of the battery regardless of the electrolyte temperature

Answer 25

A. The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 degrees F

Question 26

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?

A. 10 volts
B. 20 volts
C. 30 volts

Answer 26

C. 30 volts

Question 27

0.002KV equals:

A. 20 volts
B. 2.0 volts
C. 0.2 volt

Answer 27

B. 2.0 volts

Question 28

Which is correct in reference to electrical resistance?

A. Two electrical devices will have the same combined resistance if they are connected in series as they will have if connected in parallel
B. If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater
C. An electrical device that has a high resistance will use more power than one with a low resistance with the same applied voltage

Answer 28

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