1. The multi-meter dc voltage function is selected by the
a. range switch
b. automatic voltage selection circuit
c. VOLTMETER circuit block on the DC FUNDAMENTALS circuit board
d. person using the multi-meter
2. The symbol of the right represent
a. zener diode
b. Light emitting diode
c. semiconductor diode
d. solar cell
3. The F.A.C.E.T. base unit provides protection against
a. Over voltage and power connection
b. Over voltage, over current, and reverse current connection
c. over current and reverse current connection
d. over current and power connection
4. the term milli-ampere is abbreviated
a. mA
b. ma
c. Ma
d. mil
5. The arrow through a battery symbol indicates
a. the direction of current flow
b. the positive terminal
c. the negative terminal
d. A variable source output
6. When measuring circuits current, the ammeter is connected
a. across the component
b. to read a portion of the current
c. So order circuit, and flow through the ammeter
d. parallel to the circuit to read all the circuit current
7. The viable power source in the OHM’S LAW circuit block on the DC FUNDAMENTALS circuit board is adjusted by the
a. positive supply control on the base unit
b. negative supply control on the base unit
c. -15 Vdc control on the power supply
d. +15 Vdc control on the power supply
8. The parameters of circuit block can the altered by
a. inserting a fault via the base unit.
b. adjusting the variable power source.
c. Inserting a circuit modifications via the base.
d. Inserting loose components into circuit at designated test points.
9. On the DC FUNDAMENTALS circuit board, test point separated by dashes lines are
a. used to measure voltage
b. for inserting loose component
c. Used to energize associated circuit
d. for measuring the resistance of the circuit
DC Fundamentals
SAFETY
MCQS
1. After shutting off a machine, you should
a. start to clean up the area
b. stay with the machine until it has completely stopped
c. returns all the tools to the tool room
d. have your instructor check your work area
2. it is not good idea to talk to someone operating electrical equipment because you
a. might damage the equipment
b. could ruin an electronics device
c. both may be injured
d. may not get your work done
3. You should never touch live wires with your bare hands because you
a. may break the wires
b. may damage the circuits
c. can get an electric shock
d. can lower circuit resistance
4. The proper way to lift heavy object is to
a. bend your knees, grasp the object, raise yourself and the object by straightening your legs
b. bend your knees, grasp the object, raise yourself and the object by straightening your waist
c. let your back and arms do all the work
d. let your back do all the work
5. Removing a line cord by the plug ensure
a. a longer life for the line cord
b. that the plug will not break
c. that the line cord will break
d. your receiving an electrical shock
6. clowning around in the laboratory can cause which of the following
a. electrical shock
b. burn
c. cuts and bruises
d. all of the above
7. When two parts of your body touch an energize electrical circuit, the effect you may feel is called
a. an electrical short
b. an electrical shock
c. a burning sensation
d. a bad short circuit
8. Someone should be nearby when you work an electrical circuits to
a. keep your company
b. shut off power and give first aid incase of accident
c. show you how to repair faulty equipment if you have a problem
d. help the instructor in the rest of the class
9. Safety rules should be obey in order to
a. finish the project as quickly as possible
b. keep other student busy
c. prevent injury to yourself and others
d. all of the above
10. Why it is important to have permission to use power tools for the first time
a. Power tools cost a lot
b. There may be other people in the shop working
c. The instructor can give you safety precautions
d. Someone else may want to use it
DC Fundamentals
ELECTRONICS QUANTITIES
MCQS
1. the unit of measurement of electron flow is (an)
a. volt.
b. ohm.
c. siemen.
d. ampere.
2. A term used to describe opposition to current flow is
a. current.
b. power.
c. resistance.
d. voltage.
3. The ability of a ¼ watt resistor to give off heat is related to its
a. resistance
b. tolerance
c. type of conductance
d. physical size
4. Another term for electromotive force is
a. voltage.
b. conductance.
c. resistance.
d. current.
5. The three important ratings all resistors have are
a. resistance, tolerance, and wattage
b. size, shape, and wattage
c. length, diameter, and ability to give off heat
d. wattage, length, and voltage
6. A color-coded resistor with bands of blue, gray, and black has a value of
a. 680Ω at ± 1%
b. 68Ω at ± 20%
c. 6.8Ω at ±5%
d. 0.68Ω at ±10%
7. The opposite of resistance is
a. voltage.
b. current.
c. conductance.
d. coulomb.
DC Fundamentals
DC POWER SOURCE
MCQS
1. Which of the following cell is a dry secondary cell?
a. carbon-zinc
b. silver-oxide
c. lead-acid
d. nickel-cadmium
2. The output of a lead-acid cell is approximately
a. 1.25V.
b. 1.45V.
c. 2.1V.
d. 4V.
3. A series-opposing circuit is made up of two batteries connected
a. positive to negative
b. negative to positive
c. negative to negative and positive to positive
d. negative to negative or positive to positive
4. Cell are connected in parallel to
a. increase the voltage output
b. decrease the voltage output
c. increase the current capacity
d. decrease the current capacity
5. In a series-opposing circuit, the total voltage equals the
a. sum of each cell.
b. difference between each cell
c. way the cells are connected.
d. types of cells used in the circuit.
6. The total voltage in the circuit shown is
a. 1.5V.
b. 3V.
c. 4.5V.
d. 7.5V.
7. The potential difference in the circuit shown is
a. 2.5V.
b. 3V.
c. 5.5V.
d. 8.5V.
8. The total current capability of the circuit shown is
a. 2.5A
b. 1.5A
c. 0.5A
d. 1A
9. Cell are connected in series aiding to
a. increase the output voltage
b. decrease the output voltage
c. increase the current capacity
d. decrease the output capacity
10. The total current and voltage capabilities of the shown below are
a. 1.5V and 0.5A
b. 4.5V and 0.5A
c. 4.5V and 1.5A
d. 1.5V and 1.5A
DC Fundamentals
SWITCHES AND SWITCHING CONCEPT
MCQS
1. A DPDT switch must be used to connect
a. one conductor to one circuit.
b. two conductors to two circuits.
c. one conductor to two circuits.
d. two conductors to one circuit.
2. Which statement best describes the pole of a switch?
a. A pole is the movable part of a switch.
b. A pole is used the fixed contact of a switch.
c. A pole is used in very few switches.
d. A pole cannot carry current.
3. When a switch is closed, its contact have a
a. maximum voltage drop and minimum resistance.
b. minimum voltage drop and maximum resistance.
c. minimum voltage drop and minimum resistance.
d. maximum voltage drop only.
4. pushbutton switch can be identify as a(n)
a. PBNC switch
b. PBNO switch
c. SPST switch
d. all of the above
5. What single switch can be used to duplicate the action of two SPDT switches?
a. DPDT
b. DPST
c. PBNC
d. SPST
6. Maximum current flow in a circuit when a(n)
a. SWITCH IS OPEN.
b. SPST switch is used.
c. DPST switch is used.
d. switch is closed.
7. If all circuit shown are energized, the GREEN LED will be on when
a. S1 is not pressed
b. S2 is not pressed
c. S3 is in the DOWN position
d. S3 is in the UP position.
8. Which type of switch can control only one circuit?
a. SPST
b. SPDT
c. DPST
d. DPDT
9. If all circuit shown are energized, the RED LED will be ON when
a. S4 is in the DOWN position.
b. S2 is not pressed.
c. S3 is in the DOWN position.
d. S1 is not pressed.
10. In this circuit, which is classified as PBNO?
a. S1
b. S2
c. S3
d. S4
DC Fundamentals
OHM’S LAW
MCQS
1. In an electric circuit, if the current is 2.5 mA and the resistance is 3 KΩ, the source voltage is (E=IxR)
a. 2.5V.
b. 4.5V.
c. 5.5V.
d. 7.5V.
2. If an electric circuit has a current of 15.4 mA and a source volatge of 20 Vdc, the total resistance is (R=E / I)
a. 1300Ω
b. 1500Ω
c. 1800Ω
d. 2000Ω
3. A milliampere is
a. one thousand times larger than an ampere.
b. equal to 10 x 103
c. one thousand times smaller than ampere
d. equal to 10 x 10-3
4. In an electric circuit where the voltage and resistance are known, which form of Ohm’s law is used to find the circuit current?
a. I = I x R
b. I = R/E
c. I = E/R
d. I = E x R
5. Resistance and current are
a. measured in the same units.
b. inversely proportional.
c. directly proportional.
d. always smaller than voltage.
6. Ohm’s law is used to solve for circuit
a. current.
b. resistance.
c. voltage.
d. All of the above.
7. When you use any form of Ohm’s law, how many values must be known?
a. one
b. two
c. three
d. none
8. In an electric circuit where the voltage is 100V and the resistance is 25kΩ (25,000Ω), the current is (I = E / R)
a. 4 mA.
b. 25 mA.
c. 25 A.
d. 40A.
9. In any dc electrical circuit, voltage and current are
a. always larger than the resistance.
b. measured in the same units.
c. inversely proportional.
d. directly proportional
10. If the voltage applied to a circuit is halved while the resistance remains the same, the current (IT = VT / RT)
a. remains the same
b. is halved.
c. is doubled.
d. increases.
Fundamentals
SERIES RESISTIVE CIRCUITS
MCQS
1. In series circuit, the source voltage ( VA = VR1 + VR2)
a. is equal to the sum of the voltages across the components.
b. is applied directly across each component.
c. forces a different amount of current through each component.
d. is always divided equally among each component.
2. The sum of series voltage drops
a. is less than the smallest voltage drop.
b. equals the average value of all the voltage drops.
c. equals the applied voltage.
d. is usually more than the applied voltage.
Help VA = VR1 + VR2
3. When you connect a voltmeter to read a dc voltage,
a. polarity is not important.
b. the voltmeter is connected in series with the circuit.
c. the voltmeter is connected across the component.
d. the common meter lead is connected to the most positive point in the circuit.
4. When the resistance of a series string decreases, the
a. individual resistor voltage drops increases.
b. total current increases. (IT = ET / RT)
c. applied voltage increases.
d. circuit current remains the same.
5. In a series circuit, the current is
a. greatest in the highest value resistance.
b. the same in all parts of the circuit.
c. the sum of the current in all components.
d. greatest in the lowest value resistance.
6. A decrease of the current in a series circuit can be caused by a
a. voltage source increase.
b. resistance decrease.
c. resistance increase.
d. resistance voltage drop decrease.
7.In this circuit, if R3 increase from 1.5 kΩ to 3 kΩ, the
IT = VA / RT
a. voltage across R3 increases to 6V.
b. circuit current decreases to 1.7mA
c. current through R2 increases to 2mA.
d. voltage source increases to 15Vdc.
8. In a series circuit, the total resistance
a. is less than the resistance of any component.
b. is inversely proportional to the source voltage.
c. equal the sum of the individual resistances.
d. increases when the circuit current increases.
9 If the voltage source in the figure below is increased from 10V to 20V,then
a. the total resistance reduces to half of its original value.
b. the voltage across R1, R2, and R3 double.
c. the current through R1 and R2 doubles, and the current through R3 is cut in half.
d. there is no change in the circuit current.
10. When a voltage is indicated at some point in the circuit, the voltage is actually
a. between that point and a reference point.
b. without reference to any other point.
c. between that point and the positive terminal of the source.
d. between that point and any other point.
Fundamentals
PARALLEL RESISTIVE CIRCUITS
MCQS
1. If a 700Ω resistor wes added in parallel with the resistors below, the equivalent resistance would be.
RT=1/(1/R1+1/R2+1/R3+1/R4)
a. 350Ω
b. 503Ω
c. 702Ω
d. 1.5 kΩ
2. With three 4.5 kΩ and one 1.5 kΩ resistors in parallel, the equivalent resistance is
a. 750Ω
b. 75Ω
c. 7.5Ω
d. 0.75Ω (RT =1/(1/R1 + 1/R2 + 1/R3 + 1/R4)
3. When resistance is added in parallel, total current
a. has no relationship to the increase in resistance.
b. decreases.
c. increases. IT = ET/RT d. remains the same.
4. Branch voltage in a parallel circuit is
a. equal to the source voltage.
b. equal to the sum of the branch voltages.
c. equally divided among each branch resistance.
d. inversely proportional to the branches resistance.
5. When you connect a multi-meter in a parallel circuit to measure the total circuit current,
a. polarity is not important.
b. the meter is connected in series between the source voltage and the first branch.
c. the meter is connected in series with the first branch.
d. the meter is connected in series between the first and second branches.
6. Current in a parallel circuit is
a. greatest in the branch with the highest resistance.
b. the same in all parts of the circuit.
c. inversely proportional to the source voltage.
d. equal to the sum of all branch currents.
7. When two resistance are connected in parallel,
a. the current through each is the same.
b. the voltage across each is the same.
c. their combined resistance equal the sum of the individual values.
d. each must have the same resistance values.
8. If the voltage source of the circuit shown were increased to 30V,
a. IR1 would be 20 mA.
b. IR2 would be 13.6 mA.
c. IR3 would be 9.1 mA.
d. all of the above.
9. The total current for the circuit is
a. 6.1 mA.
b. 9.1 mA.
c. 13.3 mA.
d. 28.5 mA.
10. In parallel circuit, equivalent resistance is
a. equal to the product of the branch resistances.
b. equal to the sum of the branch resistances.
c. less than the resistance of any branch.
d. greater than the resistance of any branch.
Fundamentals
SERIES / PARALLEL RESISTIVE CIRCUITS
MCQS
1. In the parallel branch of a series/parallel resistive circuit, total current equals the sum of the currents flowing through each leg, found by
a. adding the current through each series resistor.
b. dividing the voltage across the branch by the resistance in each leg.
c. multiplying the voltage across the branch by the resistance in each leg.
d. dividing total resistance by the applied voltage.
2. If R1 shorted, the
a. circuit current would increase.
b. current through R2 would decrease.
c. current through R3 would decrease.
d. circuit current would remain the same.
3. A series/parallel equivalent resistive circuit appear as what kind of load configuration to a power source?
a. series/parallel resistors
b. single resistor
c. two series resistors
d. two parallel resistor
4. The reciprocal method for finding an equivalent resistance is usually used in a
a. parallel branch with more than two resistors.
b. parallel branch with two resistors.
c. series/parallel branch with more than two resistors.
d. series branch with more than two resistors.
5. During a circuit check of this circuit, you find that VRE is 13.18V. The probable cause of the reading is that
a. R2 is open
b. R3 is open
c. R1 is shorted
d. VA = 13.18V
6. Source voltage in series/parallel resistive circuit is increases.
a. increase as total resistance
b. distributed across each circuit component.
c. determine by the product-over-sum method.
d. equal to the voltage drop of the parallel branch
.
7. In this circuit, IT = 9.8mA, VRE = 11.76V, and VR1 = 3.23V. What is wrong with the circuit?
a. R3 is open.
b. R2 is open
c. R1 is shorted
d. nothing
8. The first step in calculating the total resistance of a series/parallel resistive circuit is to
a. find a single equivalent resistance.
b. combine all the series voltages.
c. find the equivalent resistance of the parallel branch.
d. combine all the parallel voltages.
9. To determine the voltage drop of R1, using minimum steps, You need to know
a. total circuit current.
b. parallel branch equiva-
lent resistance.
c. total circuit resistance.
d. None of the above.
10 If R3 opened, total circuit resistance would be
a. 1530Ω
b. 330Ω
c. 808Ω
d. 1130Ω
Fundamentals
POWER IN DC CIRCUITS
MCQS
1. A 5Ω resistor connected to a 20Vdc source will dissipate
a. 4W.
b. 5W.
c. 80W.
d. 100W.
2. The basic unit of measure of electric power is the
a. ampere.
b. watt.
c. volt.
d. ohm.
3. In this circuit, the power dissipated by R1 is
a. 270mW.
b. 333mW.
c. 423mW.
d. 600mW (PR1=ET2/R1)
4. The total circuit power is
(PT=ET2/RT )
a. 50mW.
b. 100mW.
c. 150mW.
d. 300mW
5. In an electric circuit where the source voltage is 120V and the total circuit current is 5A, how much power is being used?
a. 600W.
b. 288W.
c. 24W.
d. 20W.
6. The power used in series branch (R1 and R2) is
a. 50mW.
b. 100mW.
c. 150mW.
d. 300mW.
7. Electric power is the
a. same as electric pressure.
b. total number of electrons flowing in a circuit.
c. number of electrons passing a given point one second.
d. rate of using or producing electric energy.
8. Total power in series circuit is equal to the
a. total resistance multiplied by the total current.
b. sum of the power dissipated by each resistor.
c. circuit voltage divided by the circuit current.
d. difference of the power dissipated by each resistor.
9. The total power in this circuit is
(PT = VA2 / RT )
a. 50mW.
b. 75mW.
c. 300mW.
d. 600mW.
10. R3 dissipated how many watts?
(PR3 =VR32 / R3)
a. 0.0681 (RT=R1+R2+RE )/ ( IT=VA/RT )
b. 0.0833
c. 68.1
d. 83.3
DC Fundamentals
RESISTANCE QUIZ
MCQS
1. The longer wire has – – – – – – – – – – then short one
a. More resistance.
b. Less resistance
c. Faster resistance
2. The bigger diameter wire has ———- – – – – – – – – –
a. More resistance.
b. Less resistance
c. High resistance
3. The iron and steel are also conductors, but it has a – – – -to electron flow than copper
a. Same resistance.
b. Less resistance
c. High resistance
4. Silver and Gold are very good conductors but they are – – – – – – – –
. a. Cheap
b. Expensive
c. Heavy
5. What happened to the current if the resistance in the circuit increased ?
a. Increase
b. Decrease
c. Remain the same
6. Why is resistance added to a circuit
a. To control or limit the amount of current in a circuit
b. To improve current performance
c. To increase the current in circuit
7.What is the amount of resistance in carbon resistor depends on – – – ?
a. The dissipation heat produced
b. The relative amount of Carbon and Binder
c. The relative amount of voltage and current
8. The ability to dissipate heat for carbon resistor depends on – – – –
a. The physical size
b. Color code
c. Ohm meter
9. The resistance of carbon resistor decreases as the heat – – – – – – –
a. Increase
b. Decrease
c. Remain the same
10.The amount of resistance in a wire wound resistor- – – – as the temperature increases
a. Increase
b. Decrease
c. Remain the same
11. A physical property that opposes the electron flow called – — – –
a. Resistor
b Resistance
c. Current
12. Which kind of resistors can take higher current and not burn up ?’
a. Carbon resistor
b Wire wound resistors
c Tapped resistors
13. In which type of the resistors the amount of resistance can not be changed ?
a. Tapped resistor
b. Fixed resistor
c. Variable resistor
14. In which type of the resistors the amount of resistance can be adjusted by hand to different resistance values – – ?
a. Tapped resistor
b. Fixed resistor
c. Variable resistor
15. The advantages of carbon resistors are – – – – – –
a. Big size and expensive
b. Small size and low cast
c. High rating is 2 watt
16. Name the device that opposes the flow of current————?
a. Voltage
b. Power
c. Resistor
17. What is the unit of measurement for resistance —-?
a. Watt
b. Amps
c. Ohm
18. The disadvantage of carbon resistors is – – – – – –
a. Normally big size
b. Has very exact value
c. Over heats with high current
19. What are the two basic kinds of resistors by its construction – – ?
a. Variable and fixed resistors
b. Carbon and wire wound resistors
c. Carbon and fixed resistors
20. What is the advantage of using a wire wound resistor – – -?
a. Normally big size
b. Has very exact values
c. Expensive
21. In which type of resistors different values can be obtained by one or more terminals somewhere between two ends
a. Tapped resistor
b. Fixed resistor
c. Variable resistor
22. The variable resistor can be called – – – – – – –?
a. Taped
b. Potentiometer
c. Wire wound
23. To measure resistance how you connect the Ohmmeter in the circuit ?
a. Parallel
b. Series
c. Front
24. What the purpose of fuse – – – ?
a. To protect the circuit from excessive voltage
b. To protect the circuit from excessive current
c. To protect the circuit from excessive resistance
25. A fuse is placed always in – – – -with the resistor or load it has to protect.
a. Parallel
b. Series
c. Front
26. What is an Ohmmeter ?
a. An electrical circuit
b. A device that measures voltage
c. A device used to electrical resistance
27. What must you do to zero out the meter – – – – -?
a. Touch the leads together
b. Turn on the power to the circuit being tested
c. Separate the leads
DC Fundamentals
REVIEW QUESTIONS MCQs
Part I
1. When two power sources are connected in series-aiding configuration the output voltage equals the – – – -?
a. Supply with highest voltage
b. Supply with lowest voltage
c. Difference of the two supplies
d. Sum of the two supplies
2. Removing a line cord by the plug ensure
a. a longer life for the line cord
b. that the plug will not break
c. that the line cord will break
d. your receiving an electrical shock
3. A term used to describe opposition to current flow is
a. current.
b. power.
C. Resistance
d. Voltage
4. A decrease in the current of a series circuit can be caused by a – – – – – -?
a. Source voltage increases
b. Resistance decreases
c. Resistance voltage drop decrease
d. Resistance increases
5. The unit of measurement for electron flow is a(n)- – – – –
a. Volt
b Ohm
c Siemens
d ampere
6. When resistance is added to a parallel circuit, total current _ _ _ _
a. Has no relationship to the increase in the resistance
b. Decrease
c Increase
d Remains the same
7. In any electric al circuit ,voltage and current are
a. directly proportional
b. always large than the resistance
c. inversely proportional
d. measured in the same units
8. you should not talk to some one who is operating electrical equipment because you———
a. could damage the equipment
b. both can be injured
c. could ruin an electrical device
d. may not get your work done
9. in a parallel circuit total resistance ——
a. is the sum of the branch resistances
b. is greater than the resistance any branch resistor
c. is less than the resistance any branch resistor
d. increases when the circuit current increases
10. The total current in series parallel circuit is equal the —-?
a. any parallel branch circuit current
b applied voltage multiplied by the total resistance
c sum of the branch circuit current
d applied voltage divided by the total circuit resistance
11. a graphic symbol on a schematic diagram ——–
a always look like the component it represents
b shows the electrical construction of the component it represents
c can be a simple drawing of the component it represents
d is a three dimensional drawing of the component it represents
12. Cells are connected in parallel to
a. increase the voltage output
b. decrease the voltage output
c . increase the current capacity
d. decrease the current capacity
13.The output of a lead-acid cell is approximately
a 1.25V.
b 1.45V.
c 2.1V.
d 4V.
14. Why a student should take permission to use a power tool for the first time –?
a. power tool cost a lot
b the instructor can give him safety instructions
c there may be other people in the shop working
d Someone else may want to use it
15. with three 4.5 k ohm resistos and one 1.5 k ohm resistor in parallel , the total resistance is –
a 0.75 ohm
b 75 ohm
c 7.5 ohm
d 750 ohm
16. in an electrical circuit when voltage and resistance are known , which form of Ohm”s law is used to find the circuit current —-
a I = ER
b I = E/R
c I = R/E
d I=IR
17. The total voltage in series parallel circuit is —-?
a. Equal to the sum of the voltage drop across each resistor in the circuit
b distributed across each branch in the circuit
c determined by the product over sum method
d equal to the voltage drop of the parallel branch
18. A series parallel resistive circuit will appear as what kind of load to a power source ?
a multiple
b branch
c single
d double
19. The basic unit of electric power is
a watt
b volt
c ampere
d ohm
20. when you troubleshoot an electrical circuit , the first and least troublesome step to perform is —–?
a diagnostic performance check
b thorough visual inspection /check
c complete &detailed cct calibration
d performance check
