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Sample Test

Electricity for the Trades, 3e (Petruzella)

Chapter 3   Sources and Characteristics of Electricity

 

1) One of the simplest ways to produce static electricity is by friction.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

2) An electrostatic field is represented graphically by magnetic lines of force.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

3) The attractive or repulsive force that is exerted between two charged particles is directly proportional to the square of the distance between them.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

4) The attractive or repulsive force that is exerted between two charged particles is directly proportional to the strength of their charges.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

5) Electrostatic discharge (ESD) is the rapid discharge of static electricity from one object to another of a different potential.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

 

 

6) Charging by conduction occurs when a neutral object is placed in contact with an already-charged object.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

7) An electronic air cleaner uses a low AC voltage to charge its plates.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

8) An electronic air cleaner works by giving a positive charge to dirt particles in the air, then attracting them with a negative charged grid.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

9) Static electricity occurs more often during the warmer seasons.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

10) Static electricity is:

1.   A) the same as alternating current.

2.   B) the same as direct current.

3.   C) an electrical charge in motion.

4.   D) an electric charge at rest.

 

Answer:  D

Difficulty: 1 Easy

Learning Objective:  Define static and current electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

11) When a balloon and a piece of wool are rubbed together, the wool gives up electrons to the balloon. As a result:

1.   A) the balloon and wool become positively charged.

2.   B) the balloon and wool become negatively charged.

3.   C) the balloon becomes positively charged.

4.   D) the balloon becomes negatively charged.

 

Answer:  D

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

12) The law of electric charges states:

1.   A) like charges can neither repel nor attract.

2.   B) like charges repel, unlike charges attract.

3.   C) unlike charges can neither repel nor attract, whereas like charges can both repel and attract.

4.   D) unlike charges repel, like charges attract.

 

Answer:  B

Difficulty: 1 Easy

Learning Objective:  Recall the law of electric charges.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

13) For the reaction shown, the charged objects must

 

1.   A) both be positively charged.

2.   B) both be negatively charged.

3.   C) have a positive charge on one and negative charge on the other.

4.   D) either both are positively charged or both are negatively charged.

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Recall the law of electric charges.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

14) A charged object is surrounded by a(n) ________ field.

1.   A) magnetic

2.   B) electrostatic

3.   C) insulated

4.   D) open

 

Answer:  B

Difficulty: 1 Easy

Learning Objective:  Explain how static positive and negative charges are produced.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

 

 

15) A single bolt of lightning delivers about ________ of electricity.

1.   A) 1 watt

2.   B) 100 watts

3.   C) 1000 watts

4.   D) 1 trillion watts

 

Answer:  D

Difficulty: 2 Medium

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

16) Special packaging is primarily designed to protect the semiconductors against

1.   A) ESD.

2.   B) moisture.

3.   C) corrosion.

4.   D) ICS.

 

Answer:  A

Difficulty: 2 Medium

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

17) When a charge is transferred without direct physical contact, this is known as charging by:

1.   A) induction.

2.   B) conduction.

3.   C) deduction.

4.   D) friction.

 

Answer:  A

Difficulty: 2 Medium

Learning Objective:  Explain the interaction of charged objects.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

18)  It is possible for current to flow in a circuit with no voltage.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Define static and current electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

19) A battery is a common AC source.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Recognize the difference between direct current (DC) and alternating current (AC) electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

20) Polarity is normally identified only on DC circuits.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Recognize the difference between direct current (DC) and alternating current (AC) electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

21) Solar cells produce an alternating current (AC) output.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

22) A grid-tied PV system will be shut down when the power from the utility company is down.

 

Answer:  TRUE

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

23) Most of the electricity used to supply our communities is produced by chemical reaction.

 

Answer:  FALSE

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

24) If a conductor is rotated through a magnetic field, a voltage is developed in the conductor.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

25) A generator may be designed to produce AC- or DC-current electricity.

 

Answer:  TRUE

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

26) Current electricity:

1.   A) is an electric charge in motion.

2.   B) can be classified as being AC.

3.   C) can be classified as being DC.

4.   D) All of the answers are correct.

 

Answer:  D

Difficulty: 1 Easy

Learning Objective:  Define static and current electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

27) When a conducting path for electrons is placed across the two terminals of a battery, electrons flow from:

1.   A) the negative terminal to the positive terminal.

2.   B) the positive terminal to the negative terminal.

3.   C) the north pole to the south pole.

4.   D) the south pole to the north pole.

 

Answer:  A

Difficulty: 2 Medium

Learning Objective:  Recognize the difference between direct current (DC) and alternating current (AC) electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

28) The voltage waveform shown is that for

 

1.   A) DC.

2.   B) pulsating DC.

3.   C) AC.

4.   D) pulsating AC.

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Recognize the difference between direct current (DC) and alternating current (AC) electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

29) When an alternating current power source is connected to a circuit, it produces a current that:

1.   A) changes in direction, but not in magnitude.

2.   B) changes in magnitude, but not in direction.

3.   C) does not change in magnitude or direction.

4.   D) changes in both direction and magnitude.

 

Answer:  D

Difficulty: 2 Medium

Learning Objective:  Recognize the difference between direct current (DC) and alternating current (AC) electricity.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

30) A single photovoltaic cell can produce a voltage up to

1.   A) 400 mV.

2.   B) 6 V.

3.   C) 12 V.

4.   D) 120 V.

 

Answer:  A

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

31) Solar panels are grouped together to form a(n) ________ capable of delivering large amounts of electric power.

1.   A) display

2.   B) bond

3.   C) array

4.   D) battery

 

Answer:  C

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

32) The ________ in a photovoltaic power system changes DC to AC.

1.   A) rectifier

2.   B) inverter

3.   C) batteries

4.   D) disconnect switch

 

Answer:  B

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

33) Off-grid solar power systems use solar panels to produce DC electricity, which is then stored in a(n) ________ bank.

1.   A) capacitor

2.   B) battery

3.   C) inductor

4.   D) resistor

 

Answer:  B

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

34) Voltage is produced in a battery by means of:

1.   A) heat.

2.   B) light.

3.   C) a chemical reaction.

4.   D) a solar cell.

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

35) In the battery, or voltaic cell, electrons are transferred from one electrode to the other. The electrode that gains electrons is:

1.   A) the negative terminal.

2.   B) the positive terminal.

3.   C) the electrolyte.

4.   D) both the negative terminal and the electrolyte.

 

Answer:  A

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

36) A device that produces a voltage by the application of heat is:

1.   A) a crystal.

2.   B) a generator.

3.   C) a thermocouple.

4.   D) a solar cell.

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

37) A device that produces a voltage when put under mechanical pressure is:

1.   A) a battery.

2.   B) a generator.

3.   C) a solar cell.

4.   D) a crystal.

 

Answer:  D

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

38) Voltage is produced in a generator by means of:

1.   A) mechanical-magnetic energy.

2.   B) heat.

3.   C) pressure.

4.   D) friction.

 

Answer:  A

Difficulty: 1 Easy

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

39) Large amounts of electricity are usually produced using:

1.   A) a battery.

2.   B) a solar cell.

3.   C) a thermocouple.

4.   D) a generator.

 

Answer:  D

Difficulty: 2 Medium

Learning Objective:  Know the basic sources of electricity and their characteristics.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

Electricity for the Trades, 3e (Petruzella)

Chapter 5   Simple, Series, and Parallel Circuits

 

1) Use of symbols tends to make circuit diagrams more complicated.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain why symbols are used to represent electrical components.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

2) Electrical symbols always look like the part they represent.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain why symbols are used to represent electrical components.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

3) All batteries supply DC power.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the operation of basic electrical devices.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

4)  The output voltage connections of an AC power supply are identified as being positive or negative.

 

Answer:  FALSE

Difficulty: 1 Easy

Learning Objective:  Explain the symbols used to represent electrical components.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

5) The function of a circuit breaker is similar to that of a fuse.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the symbols used to represent electrical components.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

 

 

6) For a normally closed pushbutton, the contacts are closed (ON position) whenever the button is not pressed.

 

Answer:  TRUE

Difficulty: 2 Medium

Learning Objective:  Explain the symbols used to represent electrical components.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

7) All electrical load devices convert the energy of the source to another form of energy.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the operation of basic electrical devices.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

8) Resistors are used to limit and control the flow of current in a circuit.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Explain the operation of basic electrical devices.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

9) Power distribution systems are often shown using single-line diagrams.

 

Answer:  TRUE

Difficulty: 2 Medium

Learning Objective:  Describe pictorial, schematic, wiring, block, and single-line diagrams.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

10) Unlike schematic diagrams, wiring diagrams show the actual connection and placement of all components.

 

Answer:  TRUE

Difficulty: 1 Easy

Learning Objective:  Describe pictorial, schematic, wiring, block, and single-line diagrams.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

 

 

11) The symbol shown is used to represent a(n)

 

 

1.   A) AC power source.

2.   B) DC power source.

3.   C) open power source.

4.   D) closed power source.

 

Answer:  B

Difficulty: 1 Easy

Learning Objective:  Identify the symbol used to represent an electrical device.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

12) The symbol shown is used to represent a(n)

 

 

1.   A) AC power source.

2.   B) DC power source.

3.   C) open power source.

4.   D) closed power source.

 

Answer:  A

Difficulty: 1 Easy

Learning Objective:  Identify the symbol used to represent an electrical device.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

13) The symbol shown is used to represent

1.   A) wires crossed.

2.   B) a lamp holder.

3.   C) a circuit breaker.

4.   D) a fuse.

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Identify the symbol used to represent an electrical device.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

14) Which symbol would be used to represent the device shown?

 

 

A)

B)

C)

D)

 

Answer:  A

Difficulty: 1 Easy

Learning Objective:  Identify the symbol used to represent an electrical device.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

 

 

15) Which symbol would be used to represent the device shown?

 

A)

B)

C)

D)

 

Answer:  C

Difficulty: 1 Easy

Learning Objective:  Identify the symbol used to represent an electrical device.

Bloom’s:  Remember

Accessibility:  Keyboard Navigation

 

16) A fuse is used to:

1.   A) protect circuit wiring and equipment.

2.   B) allow only currents within safe limits to flow.

3.   C) automatically open the circuit when a higher current flows.

4.   D) All of the answers are correct.

 

Answer:  D

Difficulty: 2 Medium

Learning Objective:  Explain the operation of basic electrical devices.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation

 

 

 

17) Which of the following electrical diagrams is easiest to read?

1.   A) pictorial

2.   B) wiring

3.   C) perspective

4.   D) schematic

 

Answer:  D

Difficulty: 2 Medium

Learning Objective:  Describe pictorial, schematic, wiring, block, and single-line diagrams.

Bloom’s:  Understand

Accessibility:  Keyboard Navigation