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MECH1310Chapter2Homework

True/False
Indicate whether the statement is true or false.
 

 1. 
The movement of free electrons through a conductor is called current.
 

 2. 
Electrons attract each other.
 

 3. 
A resistor color coded with yellow, violet and orange bands has a value of 4.7 kÙ.
 

 4. 
A SPST switch is used to control one circuit.
 

 5. 
To measure the current through a resistor, place the ammeter so the current must pass through the meter.
 

 6. 
The ohm is the basic unit of resistance.
 

 7. 
A resistor color-coded with brown, black and orange bands has a value of 10,000 Ù.
 

 8. 
A Normally Open Push Button switch can carry current when not pushed.
 

 9. 
Electrons have a positive charge.
 

 10. 
Resistance is the opposition to the flow of current.
 

 11. 
An element with a relatively large amount of electrons in the valence ring is considered to be a good conductor.
 

 12. 
Electromotive force is measured in volts.
 

 13. 
The Nickel-Metal Hydride battery is an example of a secondary battery.
 

 14. 
A generator converts electrical energy into mechanical energy.
 

 15. 
For electrical current to flow in a circuit voltage must be applied to that circuit.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 16. 
A(n) ________ is a material that has many free electrons.
a.
insulator
c.
conductor
b.
semiconductor
d.
poor conductor
 

 17. 
An insulator is a material with ________.
a.
very many free electrons
c.
all free electrons
b.
some free electrons
d.
very few free electrons
 

 18. 
A resistor with orange, orange, red and gold bands has a value and tolerance of ________.
a.
33 kÙ ±5%
c.
3.3 kÙ ±5%
b.
33 kÙ ±10%
d.
3.3 kÙ ±10%
 

 19. 
If a resistor is color coded with red, red, orange and silver bands, the resistance equals ________, the lower tolerance limit equals ________, and the upper tolerance limit equals ________.
a.
22 kÙ, 20.9 kÙ, 23.1 kÙ
c.
22 kÙ, 21.5 kÙ, 22.4 kÙ
b.
22 kÙ, 19.8 kÙ, 24.2 kÙ
d.
22 kÙ, 17.6 kÙ, 26.4 kÙ
 

 20. 
The opposition to the flow of current is called ________.
a.
capacitance
c.
resistance
b.
voltage
d.
current
 

 21. 
If the current in a circuit equals 0 A, it is likely that the ________.
a.
resistance is too low
c.
circuit has a short
b.
circuit is open
d.
voltage is too high
 

 22. 
If the measured circuit current is zero, it is likely that the ________.
a.
voltage is turned off
c.
circuit has a short
b.
circuit voltage is very high
d.
resistance is very low
 

 23. 
Identify the Normally Open Push Button switch in Figure 2-1.
mc023-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 24. 
Identify the DPST switch in Figure 2-1.
mc024-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 25. 
Identify the Rotary switch in Figure 2-1.
mc025-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 26. 
Which switch in Figure 2-1 could be used to simultaneously open or simultaneously close two circuits?
mc026-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 27. 
Identify the Normally Closed Push Button switch in Figure 2-1.
mc027-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 28. 
Which switch in Figure 2-1 is usually used to control a doorbell?
mc028-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 29. 
The Rotary switch in Figure 2-1 is most likely to be used as ________.
mc029-1.jpg
Figure 2-1
a.
a range selector switch in an analog voltmeter.
b.
a selector for different voltages in a power supply.
c.
an old manual TV channel selector.
d.
all of the above
 

 30. 
Identify the DPDT switch in Figure 2-1.
mc030-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 31. 
Which switch in Figure 2-1 would probably be used to control a light and a fan at the same time?
mc031-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 32. 
Which switch in Figure 2-1 could be used to switch two inputs to different output positions?
mc032-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 33. 
Which switch in Figure 2-1 could be used to open a circuit momentarily?
mc033-1.jpg
Figure 2-1
a.
graph (a)
b.
graph (b)
c.
graph (c)
d.
graph (d)
e.
graph (e)
 

 34. 
What do you call a diagram that shows the electrical connections of a circuit's components?
a.
an electrical diagram
c.
a pictorial diagram
b.
a block diagram
d.
a schematic diagram
 

 35. 
To measure a circuit's source voltage, the voltmeter must ________.
a.
be placed across the source
b.
have the red lead towards the negative side of the source
c.
have the black lead towards the positive side of the source
d.
be placed in series in the circuit
 

 36. 
A source, a path, and a load ________.
a.
will allow current to flow if the switch is open
b.
make up a basic circuit
c.
can only be an open circuit
d.
do not make up a complete circuit
 

 37. 
Voltage is ________.
a.
the force that exists between charged particles
b.
the opposition to the flow of current
c.
the force that causes water to flow
d.
the movement of free electrons
 

 38. 
Which unit of charge contains 6.25 × 1018 electrons?
a.
a coulomb
c.
an ampere
b.
a volt
d.
a joule
 

 39. 
A conductor is a material that has ________.
a.
few free electrons
c.
a structure similar to semiconductors
b.
many free electrons
d.
a positive charge
 

 40. 
If a resistor equals 1.2 Ù ±5%, its color code is ________.
a.
brown, black, red, gold
c.
brown, red, gold, gold
b.
brown, black, gold, silver
d.
brown, red, silver, gold
 

 41. 
Every electrical circuit must contain ________.
a.
a source, a load and a resistor
c.
a battery, a resistor and a capacitor
b.
a source, a load and a path
d.
a battery, a path and a switch
 

 42. 
In order to measure the current in a circuit, an ammeter must ________.
a.
be placed across the source
b.
be placed across the load
c.
be placed so the current must pass through the meter
d.
all of these
 

 43. 
A resistor with yellow, violet, orange and silver bands equals ________.
a.
4.7 kÙ ± 10%
c.
47 MÙ ± 10%
b.
47 kÙ ± 5%
d.
47 kÙ ± 10%
 

 44. 
A resistor with yellow, violet, orange, and gold bands equals ________.
a.
47 kÙ ± 5%
c.
47 kÙ ± 10%
b.
4.7 kÙ ± 10%
d.
47 MÙ ± 10%
 

 45. 
If a resistor is color coded with orange, orange, orange and silver bands, the resistance equals ________, the lower tolerance limit equals ________ and the upper tolerance limit equals ________.
a.
33 kÙ, 29,700 Ù, 36,300 Ù
c.
33 kÙ, 31,350 Ù, 34,650 Ù
b.
33 kÙ, 32,670 Ù, 33,330 Ù
d.
33 kÙ, 26,400 Ù, 39,600 Ù
 

 46. 
A 100 kÙ ±10% resistor is color coded ________.
a.
black, brown, yellow, silver
c.
brown, black, yellow, silver
b.
brown, green, black, gold
d.
brown, black, yellow, gold
 

 47. 
In Figure 2-2, if you place a voltmeter's red lead on point E and its black lead on point H, you will be measuring ________.
mc047-1.jpg
Figure 2-2
a.
VR6
c.
VR5
b.
VR4
d.
VR7
 

 48. 
To measure the current that flows through R6 in Figure 2-2, the circuit must be opened and the ammeter placed at point ________.
mc048-1.jpg
Figure 2-2
a.
G
c.
E
b.
H
d.
F
 

 49. 
In Figure 2-2, the voltage VGH is the same as ________.
mc049-1.jpg
Figure 2-2
a.
VR8
c.
VR7
b.
VR5
d.
VR6
 

 50. 
In Figure 2-2, the voltage VFG is the same as ________.
mc050-1.jpg
Figure 2-2
a.
VR6
c.
VR7
b.
VR8
d.
VR9
 

 51. 
In Figure 2-2, a voltmeter placed across points C and D will measure ________.
mc051-1.jpg
Figure 2-2
a.
VR4
c.
VR3
b.
VR1
d.
VR2
 

 52. 
In Figure 2-2, the voltage VCE is the same as ________.
mc052-1.jpg
Figure 2-2
a.
VR6
c.
VR5
b.
VR4 + VR5
d.
VR3 + VR4
 

 53. 
An analog meter has ________.
a.
a digital readout
c.
a needle and a scale to indicate the value
b.
a high degree of accuracy
d.
no moving parts
 

 54. 
An ohmmeter should ________.
a.
be placed across the resistor after the resistor has been disconnected from the circuit
b.
be inserted into the circuit so the current flows through it
c.
be connected across a circuit with the power on
d.
have the polarity carefully checked before its use
 

 55. 
Most DMMs will measure ________ ________ and ________.
a.
voltage, current, capacitance
c.
voltage, frequency, resistance
b.
voltage, current, resistance
d.
frequency, voltage, current
 

 56. 
On a resistor with five bands of color code, the fifth band may represent that:
a.
the tolerance in percentage of value.
c.
the reliability in percentage of failure.
b.
the resistor is a precision resistor.
d.
all of these.
 

 57. 
On a resistor with four bands of color code, the fourth band represents:
a.
the voltage rating.
c.
the wattage rating.
b.
the tolerance percentage.
d.
the multiplier value.
 

 58. 
On a resistor with numbers and letters, the position of the letter in the sequence represents:
a.
the resistance value.
c.
the numerical total.
b.
the decimal point.
d.
the tolerance.
 

 59. 
Interpret the following mixed numbers and letters 4R7 on a resistor to the correct resistance of:
a.
4.7 Kilohms.
c.
47 ohms.
b.
4.7 Megohms.
d.
4.7 ohms.
 

 60. 
Interpret the following mixed numbers and letters 3M3 on a resistor to the correct resistance of:
a.
33 Kilohms.
c.
330 Kilohms.
b.
3300 Kilohms.
d.
3.3 Kilohms.
 

 61. 
Potentiometers and rheostats differ in that:
a.
potentiometers utilize linear and nonlinear tapers, while rheostats usually utilize only linear tapers.
b.
potentiometers utilize three terminals, while rheostats usually use only two terminals.
c.
potentiometers are used to vary voltages, while rheostats vary currents.
d.
all of these.
 

 62. 
A common type of resistors are:
a.
metal film.
c.
carbon-composition.
b.
carbon film.
d.
wirewound.
 

 63. 
In the American Wire Gauge sizes, as the numerical value of AWG goes higher, the cross sectional area of the wire:
a.
increases.
c.
decreases.
b.
doubles.
d.
halves.
 

 64. 
The basic difference between a fuse and a circuit breaker is that:
a.
a circuit breaker is more reliable.
c.
a fuse is faster.
b.
a circuit breaker is reusable.
d.
a fuse is reusable.
 

 65. 
Which type of resistor is used for high power applications?
a.
carbon composition
c.
surface mount
b.
film
d.
wire wound
 

 66. 
What does the schematic symbol (b) represent in Figure 2-3?
mc066-1.jpg
Figure 2-3
a.
potentiometer
c.
thermistor
b.
rheostat
d.
photoconductive cell
 

 67. 
Which of the following is not a type of variable resistor?
a.
potentiometer
c.
photoconductive cell
b.
thermistor
d.
All are types of variable resistors.
 

 68. 
The voltage measured directly across an open switch in a circuit will be:
a.
0 V.
c.
full applied voltage.
b.
half of applied voltage.
d.
unpredictable.
 



 
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