Name: ________________________ Class: ___________________ Date: __________
ID: A
MECH 1100 Final Review
True/False
Indicate whether the statement is true or false.
____
1. Electrical current is defined as the energy required to move electrons.
____
2. The unit of charge is ampere.
____
3. The unit of resistance is ohms.
____
4. The unit of energy is a joule.
____
5. Voltage and current are inversely related when resistance remains constant
____
6. The resistance is said to be infinite for an open circuit.
____
7. If you remove a resister in a series circuit, the circuit will still function properly.
____
8. Current remains constant in a series circuit.
____
9. Voltage drops are constant in a series circuit.
____ 10. The larger a resister is, the larger the current.
____ 11. A potentiometer can be used as a voltage divider.
____ 12. Resistors in parallel are connected between two nodes in a circuit.
____ 13. A parallel circuit provides more than one path for current.
____ 14. Current remains constant in a parallel circuit.
____ 15. Voltage across a parallel circuit remains constant.
____ 16. If one of the branches of a parallel circuit opens, the total resistance increases, and therefore the total current
decrease.
____ 17. Opens and shorts in circuits are typical faults.
____ 18. A permanent magnet will retain its magnetism for a long period of time.
____ 19. Unlike magnetic poles repulse on another.
____ 20. Magnetic flux in another name for magnetic field.
1
Name: ________________________
ID: A
____ 21. A conductor with no current through it will still have a magnetic field around it.
____ 22. Aluminum, brass, and iron make good magnets.
____ 23. Two north magnetic poles attract one another.
____ 24. A magnetic field around a conductor is a good indication that current is flowing.
____ 25. The period of a 60Hz sine wave is 16.7ms.
____ 26. An advantage of a of a three-phase induction motor is that it does not require starter windings.
____ 27. The difference in the synchronous speed of the stator field and the rotor speed of a motor is called the
differential speed.
____ 28. A sychronous motor can be used when constant speed is required.
____ 29. A sine wave’s frequency equals the reciprical of its period
____ 30. The higher a sine waves frequency, the shorter it’s period.
____ 31. An AC current is inversely proportional to an AC voltage.
____ 32. RMS is another name for peak.
____ 33. 7.07V PP is approximately equal to 2.5V RMS
____ 34. Current flows both ways simultaneously in an AC circuit.
____ 35. Capacitance is the ability to store voltage.
____ 36. A capacitor blocks dc and passes ac.
____ 37. When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the larger
voltage.
____ 38. If the distance between the plates of a capacitor increases, the capacitance decreases.
____ 39. A capacitor can fully charge in one time constant.
____ 40. Capacitance is a capacitor’s ability to store resistance.
____ 41. When two capacitors are connected in series across a dc source, the smallest capacitor drops the largest
voltage.
____ 42. Efficient filtering is directly related to RC time constant.
2
Name: ________________________
ID: A
____ 43. Only the number of turns in the primary and secondary of a transformer determines the actual secondary
voltage.
____ 44. A transformer can be used as an impedance matching device.
____ 45. A step-down transformer could have a primary-secondary turns ratio of 4:1
____ 46. The efficiency of all transformers is very low.
____ 47. A transformer with a turns ratio of 1:1 is often used to isolate a load from a source.
____ 48. An ideal transformer has no power loss.
____ 49. A typical transformer fault would be an open winding.
____ 50. Autotransformers cannot be used for isolation purposes since there is only one winding.
____ 51. The impedance matching characteristic for a transformer is needed for a situation where maximum power
transfer to the load is desired.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 52. Seven thousand volts can be expressed as
a. 7 MV
b. 7 kV
c.
d.
7000 V
b and c
____ 53. Express 7.32 × 10 7 in engineering notation
a. 732 × 10 7
b. 73.2 × 10 6
c.
d.
.732 × 10 6
732 × 10 6
____ 54. Express 8.57 × 10 8 in engineering notation
a. 85.7 × 10 9
b. 85.7 × 10 7
c.
d.
857 × 10 6
857 × 10 9
Ê
ˆ Ê
ˆ
____ 55. ÁÁ 5 × 10 3 ˜˜ + ÁÁ 8.5 × 10 −1 ˜˜
Ë
¯ Ë
¯
3
a. 5.085 × 10
b. 5.000085 × 10 3
c.
d.
5.0085 × 10 3
5.00085 × 10 3
____ 56. Express the number 0.0004 in Scientific notation
a. 400 × 10 −6
c.
−3
b. 0.4 × 10
d.
3
4 × 10 −4
0.4 × 10 −4
Name: ________________________
ID: A
____ 57. Express the number 0.00054 in Scientific notation
c. 540 × 10 −6
a. .54 × 10 −3
b. 5.4 × 10 −4
d. 5.4 × 10 −5
Ê
ˆ Ê
ˆ
____ 58. ÁÁ 7 × 10 4 ˜˜ + ÁÁ 25 × 10 2 ˜˜
Ë
¯ Ë
¯
3
a. 72.5 × 10
b. 725000
c.
d.
70025
32 × 10 6
Ê
ˆÊ
ˆ
____ 59. ÁÁ 7 × 10 4 ˜˜ ÁÁ 25 × 10 2 ˜˜
Ë
¯Ë
¯
8
a. 32 × 10
b. 175 × 10 6
c.
d.
175 × 10 8
32 × 10 8
____ 60. Which of the following is not a type of energy source?
a. battery
c. generator
b. solar cell
d. potentiometer
____ 61. Potentiometers and rheostats are types of
a. voltage sources
b. variable resisters
c.
d.
fixed resisters
circuit breakers
____ 62. Which one of the following is not a type of energy source?
a. generator
c. solar cell
b. potentiometer
d. battery
____ 63. If the current in a given circuit is not to exceed 23A. Which value of fuse is the best?
a. 15A
c. 25A
b. 20A
d. 30A
____ 64. Which one item below is not necessary for a complete circuit? _________________
a.
b.
Load
Voltage
c.
d.
Switch
Current path
c.
d.
SPST
SPDT
____ 65. This is a _________ switch.
a.
b.
NCPB
NOPB
____ 66. Apply ohms law: If resistance is held constant and voltage is increase, what happens to the current?
a. nothing
c. it goes up
b. it goes down
d. it depends on the voltage
4
Name: ________________________
ID: A
____ 67. Apply ohms law: If resistance is increased and voltage remains constant, what happens to the current?
a. nothing
c. it goes up
b. it goes down
d. it always doubles
____ 68. What is the current through a 1.2kΩ resister with a constant voltage of 24V
c. 20mA
a. 2mA
b. .02mA
d. 20µA
____ 69. Calculate the voltage across a 500Ω resister when the current is 450mA
a. 110V
c. 0.9V
b. 0.225V
d. 225V
____ 70. A 25Ω half-watt resister and a 225Ω half-watt resister are connected across a 12V source. Which one(s) will
overheat?
a. 25Ω
c. both
b. 225Ω
d. neither
____ 71. Four equal-value resistors are connected in series and there is a current of 5mA into the first resister. The
amount of current in the fourth resister is
a. 20mA
c. 1.25 mA
b. 5mA
d. 10mA
____ 72. A series circuit consists of four resisters with values of 100Ω,300Ω,600Ω and 1.5kΩ. The total resistance
will be
a. 1001.5Ω
c. 2.5MΩ
b. 63.83Ω
d. 2.5kΩ
____ 73. What is the total voltage of the circuit?
a.
b.
12V
-12V
c.
d.
36V
-36V
____ 74. In a parallel circuit, each resister has _____________.
a. the same current
c. the same voltage
b. the same power
d. none of the above
____ 75. A 400Ω resister, 250Ω resister, and a 100Ω resister are all in parallel. The total resistance will be
approximately _____________.
a. 750Ω
c. 60Ω
b. 0.0165Ω
d. 10MΩ
5
Name: ________________________
ID: A
____ 76. If you remove one light bulb from a strand of Christmas lights that are wired in parallel, then
______________.
a. all of the lights will go out.
c. the rest of the lights are uneffected.
b. half the lights will go out.
d. None of the above
____ 77. A sudden decrease in the total current into a parallel circuit may indicate __________.
a. a short
c. an open resister
b. a drop in source voltage
d. B or C
____ 78. Two 800Ω are in series and this series combination is in parallel with a 1.4kΩ resister. The voltage across
one of the 800Ω resisters is 15V. The voltage across the 1.4kΩ is
a. 7.5V
c. 15V
b. 45V
d. 30V
____ 79. The output current of a circuit supplied to a load.
a. Bleeder current
c.
b. Load current
d.
Loading
Balanced bridge
____ 80. When a load resister is connected across a voltage-divider output, the output voltage ____________.
a. increases
c. stays the same
b. decreases
d. divides in half
____ 81. A solenoid consists of ___________.
a. Two plates separated by an insulator
b. a burgular alarm relay
c.
d.
a coil of wire wound around a core
a permanent magnet
____ 82. A coil of wire with current flowing through it is called a(n) ____________.
a. capacitor
c. south pole
b. north pole
d. electromagnet
____ 83. If two north magnetic poles are brought close to each other, _____________.
a. a force of attraction pulls them together c. a force of repulsion pushes them apart
b. an electromagnet is created
d. a current is induced
____ 84. How does the magnetic field change around a conduction wire if the current increases?
a. The field grows stronger
c. There is no magnetic field around a
conducting wire.
b. The field grows weaker
d. It is impossible to predict.
____ 85. Permeability is _________________.
a. the shielding effect of a material
b. the ease of a material to be magnetized
c.
d.
the opposition to being magnetized
the ability of a magnetic material to
conduct a current
____ 86. Which of the statements below does NOT apply to the voltage induced into a wire when it is moved through
a magnetic field?
a. It depends on the strength of the
c. It depends on the speed of the wire
magnetic field.
motion.
b. It depends on the current flowing in the
d. It depends on the length of moving wire
wire.
in the field.
6
Name: ________________________
ID: A
____ 87. Unlike magnetic poles _________ and like poles ____________.
a. repel, repel
c. attract, attract
b. repel, attract
d. attract, repel
____ 88. According to the left-hand rule for the magnetic field around a conductor, what points in the direction of
current flow.
a. fingers
c. thumb
b. meter
d. index finger
____ 89. A _____________ is a type of electromagnet devicethat has a movable iron core called a plunger.
a. realy
c. solenoid
b. speaker
d. analog meter
____ 90. The polarity of an induced voltage depends on the _____________.
a. time that the conductor remains
c. direction of motion of a conductor in a
stationary in a magnetic field
magnetic field
b. length of a conductor in a magnetic field d. amount of curent flowing
____ 91. A relay is a device that ____________.
a. uses and electromagnet to open and close c.
contacts
b. isolates the actuating signal from the
d.
control signal
has a coil to actuate some contacts that
control other circuits
all of these
____ 92. Electromagnetic induction is best defined as the process by which a voltage is produced in a conductor when
there is:
a. motion between the magnetic poles.
c. motion around the magnetic fields.
b. motion between the conductor and the
d. energy produced by the rotating coils.
magnetic field.
____ 93. The difference between alternating current and direct current is
a. ac changes value and dc does not
c. both a and b
b. ac changes direction and dc does not
d. neither a nor b
____ 94. A sine wave with a frequency of 13kHz is changing at a faster rate than a sine wave with a frequency of
a. 18kHz
c. 12,000 Hz
b. 16,000 Hz
d. 1.5 MHz
____ 95. The period of a 50Hz sine wave is
a. .02ms
b. 20ms
c.
d.
500s
50s
____ 96. When a sine wave has a frequency of 60Hz, in 12s it goes through
a. 120 cycles
c. 7200 cycles
b. 5 cycles
d. 720 cycles
____ 97. If the peak value of a sin wave is 5V, the peak-to-peak value is
a. 5V
c. 0V
b. 10V
d. 2.5V
7
Name: ________________________
ID: A
____ 98. Which one of the following represents the value at point G?
a.
b.
the period
the RMS voltage
c.
d.
the peak voltage
the frequency
____ 99. If the time from point A to H is 60µs the frequency is
a.
b.
25kHz
16.7kHz
c.
d.
50kHz
More information needed to calculate the
frequency
____ 100. What is the capacitance of a capacitor that drops 50V and stores 0.500µC of charge?
a. 0.1µF
c. 0.001µF
b. 1µF
d. 0.01µF
____ 101. If the dc working voltage of a capacitor is 100V, the dielectric must withstand ___________.
a. 100V DC
c. 220V PP
b. 75V RMS
d. 85V RMS
____ 102. If a 0.022µF , 0.022µF and 0.05µF capacitor are connected in series across a 25V source, the voltage drop
across the largest capacitor equals ___________.
a. 10.2 V
c. 4.51 V
b. 11.8 V
d. 17.5 V
8
Name: ________________________
ID: A
____ 103. If a 4.7µF capacitor and a 10kΩ resister connected in series across 25V DC , approximately how much voltage
will the resister drop after charging for just one time constant?
a. 9.20V
c. 21.6V
b. 23.8V
d. 15.8V
____ 104. If a 1µF , 2.2µF and 0.05µF capacitor are connected in series, C T is less than ___________.
a. 1µF
c. 0.05µF
b. 2.2µF
d. 0.001µF
____ 105. What is one time constant of a 47µF in series with a 120kΩ resistor?
a. 0.564ms
c. 5.64s
b. 564ms
d. 54.6s
____ 106. When capacitors are connected in series, their total capacitance act like:
a. resistance connected in series
c. resistance connected in series-parallel
b. resistance connected in parallel
d. all of these
____ 107. The hysteresis loss in a transformer is ___________.
a. caused by current flowing in the core
c. caused by the resistance of the wire
d. another name for flux leakage loss
b. cause by rapid reversal of the magnetic
field
____ 108. Eddy current loss in a transformer is _____________.
a. due to current flowing in the core
c. caused by the resistance of the wire
b. caused by rapid reversal of the magnetic d. another name for flux leakage loss
field
____ 109. The phrase “Maximum power is delivered to the load when the load resistance equals the source resistance”
is a definition of ____________.
a. Lenz’s Law
c. the maximum power transfer theorem
b. Ohm’s Law
d. Kirchhoff’s Law
____ 110. What is the secondary voltage if the turns ratio is 7:1?
a.
b.
17.1V RMS
840V RMS
c.
d.
9
8.59V RMS
420V RMS
Name: ________________________
ID: A
____ 111. What is the secondary current with a 100Ω load resistor and 3:1 turns ratio?
a.
b.
33mA RMS
40mA RMS
c.
d.
330mA RMS
400mA RMS
____ 112. What is the secondary voltage if the turns ratio is 4.5:1?
a.
b.
540V
26.7V
c.
d.
5.92V
4.72V
____ 113. What is the secondary current with a 50Ω load resistor and 4:1 turns ratio?
a.
b.
1.66A
600mA
c.
d.
9.6A
4.8A
____ 114. What is the primary current if the turns ratio equals 4:1 and I S = 40mA ?
a.
b.
160mA
40mA
c.
d.
10
10mA
4mA
Name: ________________________
ID: A
____ 115. If 10W of power are applied to the primary of an ideal transformer with a turns ratio of 1:5, the power
delivered to the secondary load is _________.
a. 50W
c. 0W
b. 0.5W
d. 10W
____ 116. Matching a transformer’s primary needs ________ more turns than its secondary to match 600Ω audio signal
distribution line to an 8Ω speaker.
a. 8.66
c. 0.013
b. 75
d. 0.115
____ 117. Transformers ___________.
a. convert a lower current into a higher
current
b. convert a higher voltage into a lower
voltage
c.
d.
match the impedance of a source to the
impedance of a load
All of these
____ 118. A step-up transformer will increase _________ and decrease ________.
a. voltage, impedance
c. voltage, power
b. current, impedance
d. power, current
____ 119. When the turns ratio of a transformer is 1:10 and the primary AC voltage is 6V, then the secondary voltage is
___________.
a. 60V
c. 6V
b. 0.6V
d. 36V
____ 120. An autotransformer differes from most transformers in that:
a. primary and secondary windings are the c. it does not isolate the primary voltage
same.
from the secondary voltage.
b. source current flows through both the
d. all of these
windings.
____ 121. What type transformer most likely has a 1:1 turns ratio?
a. impedance matching
c. power
b. isolation
d. center tapped
____ 122. An air core transformer would most likely be used for:
a. radio frequencies.
c. audio frequencies.
b. isolation.
d. impedance matching.
Completion
Complete each statement.
123. Hertz is the unit of ___________
124. The unit of resistance is ____________
125. The unit of voltage is _________
126. The unit of power is ____________
11
Name: ________________________
ID: A
127. The unit of energy is _______________
128. Express 75000 in scientific notation
129. Express 0.002 in scientific notation
130. Express 0.0000002 in scientific notation
131. How many coulombs of charge do 90.5 × 10 14 electrons represent?
132. How many coulombs of charge do 80.3 × 10 12 electrons represent?
133. If 40J of energy are required to move 10 C of charge, what is the voltage?
134. If 19200J of energy are required to move 40 C of charge, what is the voltage?
135. Ten coulombs of charge flow past a given point in a wire in 4s. What is the curent in amperes?
136. A certain Thevenin equivalent circuit has a V th = 6V and an R th = 75Ω . To what value of load resister will
maximum power be transferred?
Matching
a.
b.
c.
Parallel
Branch
Node
d.
e.
Current divider
Kirchhoff’s current law
____ 137. One current path in a parallel circuit.
____ 138. A parallel circuit in which the currents divide inversely proporational to the parallel branch resistances.
____ 139. A law stating that the total current into a node equals the total current out of the node.
____ 140. The relationship between two circuit components that exists when they are connected between the same pair
of nodes.
____ 141. A point or a junction in a circuit at which two or more components are connected.
a.
b.
Superposition
Wheatstone bridge
c.
d.
Load current
Thevenin Equivalent
____ 142. The output current of a circuit supplied to a load.
____ 143. A method for analyzing circuits with two or more sources by examining the effects of each source by itself
and then combining the effects.
12
Name: ________________________
ID: A
____ 144. A four-legged type of bridge circuit with which an unknown resistance can be accurately measured using the
balanced state of the bridge. Deviations in resistance can be measured using the unbalanced state.
____ 145. A circuit theorem that provides for reducing any two-terminal resistive circuit to a single equivalent voltage
source in series with an equivalent resistance.
a.
b.
c.
d.
Electrical isolation
Secondary winding
Center tap
Impedance matching
e.
f.
g.
h.
Turns ratio
Apparent power rating
Primary winding
Transformer
____ 146. The method of rating transformers in which the power capability is expressed in volt-amperes.
____ 147. A connection at the midpoint of a winding in a transformer.
____ 148. The condition in which two circuits have no common conductive path between them.
____ 149. A technique used to match a load resistance to a source resistance in order to achieve maximum.
____ 150. The input winding of a transformer.
____ 151. The output winding of a transformer.
____ 152. The ratio of turns in the secondary windings to turns in the primary winding.
____ 153. An electrical device constructed of two or more coils of wire (windings) that are electromagnetically coupled
to each other so that there is mutual inductance from one winding to another.
Problem
154. Calculate the voltage across a 350Ω resister when the current is 314.28mA.
155. If you run your refrigerator for 12 hours a day, assuming that it uses 500W, how much does it cost you to run
your refrigerator for a month (30 days). The current average price is 12 cents per kilowatt-hour.
156. Calculate the resistance and the power for the following circuit.
13
Name: ________________________
ID: A
157. Calculate R T and I T . Then calculate the total power.
158. Calculate the voltage drop across the potentiometer.
159. Find I T and the voltage drop across R 1 ,R 2, and R 3 . Verify (show) your results by using Kirchhoff’s Voltage
Law.
14
Name: ________________________
ID: A
160. Calculate the value of R T .
161. Calculate the value of R T ,I T ,I R1 ,I R2 ,I R3 ,V R1 ,V R2 ,V R3 .
162. In a certain magnetic field the cross-sectional area is 0.4m2 and the flux is 1400µWb. What is the flux
density?
163. In a certain magnetic field the cross-sectional area is 0.5m2 and the flux is 1600µWb. What is the flux
density?
164. There is 0.2A of current through a coil with 300 turns.
a) What is the mmf?
b) What is the the reluctance of the circuit if the flux is 350µWb?
15
Name: ________________________
ID: A
165. Calculate V RMS , I RMS and P RMS
V RMS =___________ I RMS =_____________ P RMS = _____________
166. Calculate the total capacitance, the reactants for each capacitor and the voltage drop across C 2 in RMS.
Total Capacitance = ______________ X C1 =___________
V C2 =__________
16
X C2 =_____________
Name: ________________________
ID: A
167. Calculate the total capacitance, the reactants for each capacitor and the voltage drop across C 3 in RMS.
Total Capacitance = ______________ X C3 =___________
X C4 =_____________
V C2 =__________
168. Calculate the time constant τ and the instantaneous charging voltage at 1 time constant using RMS voltage.
τ = ________ V ins tan tan eous = ________
17
ID: A
MECH 1100 Final Review
Answer Section
TRUE/FALSE
1. ANS: F
False, Current is defined as the rate of flow of free electrons.
PTS: 1
2. ANS: F
Coulomb
3.
4.
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Slip
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ID: A
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MULTIPLE CHOICE
52.
53.
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ANS:
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ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
D
B
C
D
C
B
A
B
D
B
B
B
C
B
C
B
C
D
C
B
D
2
ID: A
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
104.
105.
106.
107.
108.
109.
110.
111.
112.
113.
114.
115.
116.
117.
ANS:
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ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
C
C
C
C
D
D
B
B
C
D
C
A
B
B
D
C
C
C
D
B
B
C
B
D
B
B
A
D
A
C
A
C
C
B
B
A
C
A
D
B
B
C
D
A
D
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
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PTS:
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PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
ID: A
118.
119.
120.
121.
122.
ANS:
ANS:
ANS:
ANS:
ANS:
A
A
D
B
A
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
COMPLETION
123. ANS: Frequency
PTS: 1
124. ANS: Ohm
PTS: 1
125. ANS: Volt
PTS: 1
126. ANS: Watt
PTS: 1
127. ANS: Joule
PTS: 1
128. ANS: 7.5 × 10 4
PTS: 1
129. ANS: 2 × 10 −3
PTS: 1
130. ANS: 2 × 10 −7
PTS: 1
131. ANS: .001448C or 14.48 × 10 −4 C
PTS: 1
132. ANS: .00001284C or 12.84 × 10 −6 C
PTS: 1
133. ANS: 40J/10C = 4V
PTS: 1
134. ANS: 19200J/40C = 480V
PTS: 1
4
ID: A
135. ANS: 10C/4s = 2.5A
PTS: 1
136. ANS:
Maximum power occurs when the R th = R L
R L = 75Ω
PTS: 1
MATCHING
137.
138.
139.
140.
141.
ANS:
ANS:
ANS:
ANS:
ANS:
B
D
E
A
C
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
142.
143.
144.
145.
ANS:
ANS:
ANS:
ANS:
C
A
B
D
PTS:
PTS:
PTS:
PTS:
1
1
1
1
146.
147.
148.
149.
150.
151.
152.
153.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
F
C
A
D
G
B
E
H
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
1
1
1
PROBLEM
154. ANS:
110V
PTS: 1
155. ANS:
$21.6
500*12=6000W
6000W*30= 180000W = 180kW
180kW* .12 = 21.6
PTS: 1
5
ID: A
156. ANS:
R = 12Ω
P = 48W
PTS: 1
157. ANS:
R T = 5kΩ
I T = 2.4mA
P = 28.8mWatts
PTS: 1
158. ANS:
V potentiometer = 4V
PTS: 1
159. ANS:
I T = 4.73mA
R 1 = 1.18V
R 2 = 4.26V
R 3 = 3.55V
PTS: 1
160. ANS:
R T = 286Ω
PTS: 1
161. ANS:
R T = 127.659Ω
I T = 188mA
I R1 = 96mA
I R2 = 60mA
I R3 = 32mA
V R1 = 24V
V R2 = 24V
V R3 = 24V
PTS: 1
162. ANS:
.0035 T or 3500µT
PTS: 1
6
ID: A
163. ANS:
.0032 T or 3200µT
PTS: 1
164. ANS:
a) 60 At
b) 1.7 × 10 5 At
PTS: 1
165. ANS:
V RMS = 42.42V
Wb
I RMS = 13mA P RMS = 553.6mW
PTS: 1
166. ANS:
Total Capacitance = 30µF X C1 =35.36Ω X C2 =53.05Ω
V C2 =50.9V
PTS: 1
167. ANS:
Total Capacitance = 77µF X C3 =56.4Ω X C4 =88.41Ω
V C3 =120V
PTS: 1
168. ANS:
τ = 4.23 V ins tan tan eous = 31.2
PTS: 1
7