Download Chapter 002 Resistors

Full file at
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True / False Questions
1. The main function of a resistor is to limit the amount of current or produce a desired drop
in voltage.
True False
2. The two main characteristics of a resistor are its resistance in ohms and its tolerance in
mhos.
True False
3. Metal-film resistors are made of finely divided carbon or graphite mixed with a powdered
insulating material.
True False
4. A thermistor is a thermally sensitive resistor whose resistance value changes with changes
in operating temperature.
True False
5. A resistor that is color-coded red, green, red has a value of 2500 ohms.
True False
6. The amount by which the actual resistance can differ from the color-coded value is the
positive temperature coefficient.
True False
02-1
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
7. Zero-ohm resistors are commonly found on printed circuit boards.
True False
8. Variable resistors can be wire-wound or carbon type.
True False
9. A decade resistance box is typically used as a potentiometer.
True False
10. A rheostat has two terminals and a potentiometer has three terminals.
True False
11. A potentiometer can never be wired as a rheostat.
True False
12. Wire-wound resistors are larger and have higher wattage ratings than carbon resistors.
True False
13. Resistors have a relatively short shelf life and only keep their characteristics for six to
eight months.
True False
14. The most common trouble in resistors is an open.
True False
02-2
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
15. When checking resistance in a circuit, it is important to be sure there are no parallel
resistance paths.
True False
Multiple Choice Questions
16. The power or wattage rating of a resistor is determined by
A. color-coded bands
B. its function in a circuit
C. its physical size
D. measuring its resistance
17. A resistor is used to
A. limit current or produce a voltage drop
B. step up current
C. increase voltage
D. amplify signals
18.
A.
B.
C.
D.
Two major characteristics of a resistor are
resistance in ohms and tolerance in percentage
resistance in ohms and power rating in watts
resistance in ohms and conductivity in mhos
resistance in ohms and power in joules
19. In electronic equipment, the resistor most commonly used is the
A. wire-wound
B. film-type
C. carbon-composition
D. carbon
02-3
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
20. What type of resistor is constructed by wrapping resistance wire around an insulating
core?
A. Carbon
B. Carbon-composition
C. Film-type
D. Wire-wound
21. What type of resistor is typically used as a precision resistor?
A. Carbon
B. Carbon-composition
C. Film-type
D. Wire-wound
22. What type resistor is formed by spraying a thin film of metal onto a ceramic substrate and
then cut in the form of a spiral?
A. Carbon
B. Wire-wound
C. Carbon composition
D. Metal-film
23. What is the resistor called that is designed to burn open easily when the power rating is
exceeded?
A. Thermistor
B. Varistor
C. Fusible
D. Chip
24. A resistor whose resistance value changes with changes in operating temperature is a
A. thermistor
B. varistor
C. fusible
D. chip
02-4
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
25. What type resistor is frequently used in electronic circuits in which it is desired to provide
temperature control?
A. Thermocouple
B. Thermodynamic
C. Thermistor
D. Varistor
26. If a resistor is color-coded red, blue, and orange, what is its resistance value?
A. 2500 ohms
B. 2600 ohms
C. 26,000 ohms
D. 260 ohms
27. The amount by which the actual resistance can differ from the color-coded value is the:
A. power rating
B. temperature coefficient
C. tolerance
D. differential resistance
28. A resistor with a single black band around the center of the resistor body has a resistance
of
A. one
B. zero
C. 1000
D. infinity
29. The resistance value of a chip resistor is determined from the
A. color-code
B. size of the resistor
C. three digit number printed on the film or body
D. three letters printed on the body
02-5
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
30. Variable resistors can be wire-wound or
A. carbon type
B. metal-film type
C. fusible
D. zero resistance type
31. The way resistance varies with shaft rotation in a variable resistor is called the
A. variable of the control
B. variance of the control
C. rheostat
D. taper of the control
32. A device that is used to provide any one resistance within a wide range of values is a
A. varistor
B. decade box
C. fusible resistor
D. decimal box
33. Rheostats and potentiometers are referred to as
A. amplifiers
B. fixed resistors
C. variable resistors
D. fusible resistors
34. A potentiometer has
A. one terminal
B. two terminals
C. three terminals
D. four terminals
02-6
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
35. A variable resistance with two terminals that is connected in series with the load is a
A. potentiometer
B. rheostat
C. tunable transformer
D. varistor
36. What resistive device is generally used to control relatively large values of current in
low-resistance circuits for ac power applications?
A. Fusible resistor
B. Potentiometer
C. Rheostat
D. Zero-ohm resistor
37. Commercial rheostats are typically
A. wire-wound, high wattage resistors
B. wire-wound, low wattage resistors
C. carbon, high wattage resistors
D. metal-film, low wattage resistors
38. The power rating is a property of a resistor that depends on the resistor's
A. color-code
B. size
C. function in a circuit
D. composition
39. For ambient temperatures greater than 70C, the power rating of a resistor must be
A. increased
B. derated
C. doubled
D. held constant
02-7
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
40. When not used, resistors generally keep their characteristics
A. for about one week
B. for about one year
C. almost indefinitely
D. between one to two years
41. The most common trouble in resistors is
A. an open
B. a short
C. leakage
D. lower than listed tolerance
42. What is indicated when a volume or tone control makes a scratchy noise as the shaft is
rotated?
A. Shorted resistance element
B. Open resistance element
C. Worn or dirty resistance element
D. Wrong resistance value
43. Resistance is measured with a(n)
A. oscilloscope
B. ohmmeter
C. ammeter
D. voltmeter
44. As measured with an ohmmeter, infinite ohms means
A. an open circuit
B. a shorted circuit
C. low resistance
D. zero resistance
02-8
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
45. What may cause a much lower resistance value to be displayed on an ohmmeter when
checking resistance in a circuit?
A. Low batteries in the ohmmeter
B. The circuit power is on
C. Parallel resistance paths
D. Open resistors
46. Aging, which is normal resistor heating over a long period of time causes the resistor to
exceed its
A. power rating
B. derating factor
C. shelf life
D. tolerance
Fill in the Blank Questions
47. Resistors with higher resistance values usually have ______________ wattage ratings.
________________________________________
48. Since they are generally used for high-current applications, ______________ resistors are
available in wattage ratings from 1W up to 100W or more.
________________________________________
49. ______________-mount resistors are constructed by depositing a thick carbon film on a
ceramic base.
________________________________________
02-9
Full file at
http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz
50. A ______________ resistor is a wire-wound resistor made to burn open easily when the
power rating is exceeded.
________________________________________
02-10
Chapter 002 Resistors Key
True / False Questions
1. (p. 58) The main function of a resistor is to limit the amount of current or produce a desired
drop in voltage.
TRUE
Difficulty: Easy
2. (p. 60) The two main characteristics of a resistor are its resistance in ohms and its tolerance in
mhos.
FALSE
Difficulty: Easy
3. (p. 61) Metal-film resistors are made of finely divided carbon or graphite mixed with a
powdered insulating material.
FALSE
Difficulty: Medium
4. (p. 62) A thermistor is a thermally sensitive resistor whose resistance value changes with
changes in operating temperature.
TRUE
Difficulty: Easy
5. (p. 60) A resistor that is color-coded red, green, red has a value of 2500 ohms.
TRUE
Difficulty: Easy
02-11
Chapter 002 Resistors Key
6. (p. 64) The amount by which the actual resistance can differ from the color-coded value is the
positive temperature coefficient.
FALSE
Difficulty: Medium
7. (p. 66) Zero-ohm resistors are commonly found on printed circuit boards.
TRUE
Difficulty: Hard
8. (p. 67) Variable resistors can be wire-wound or carbon type.
TRUE
Difficulty: Medium
9. (p. 68) A decade resistance box is typically used as a potentiometer.
FALSE
Difficulty: Easy
10. (p. 69) A rheostat has two terminals and a potentiometer has three terminals.
TRUE
Difficulty: Medium
11. (p. 70) A potentiometer can never be wired as a rheostat.
FALSE
Difficulty: Easy
02-12
Chapter 002 Resistors Key
12. (p. 71) Wire-wound resistors are larger and have higher wattage ratings than carbon
resistors.
TRUE
Difficulty: Medium
13. (p. 72) Resistors have a relatively short shelf life and only keep their characteristics for six to
eight months.
FALSE
Difficulty: Easy
14. (p. 72) The most common trouble in resistors is an open.
TRUE
Difficulty: Medium
15. (p. 73) When checking resistance in a circuit, it is important to be sure there are no parallel
resistance paths.
TRUE
Difficulty: Medium
02-13
Chapter 002 Resistors Key
Multiple Choice Questions
16. (p. 58) The power or wattage rating of a resistor is determined by
A. color-coded bands
B. its function in a circuit
C. its physical size
D. measuring its resistance
Difficulty: Easy
17. (p. 58) A resistor is used to
A. limit current or produce a voltage drop
B. step up current
C. increase voltage
D. amplify signals
Difficulty: Easy
18. (p. 60) Two major characteristics of a resistor are
A. resistance in ohms and tolerance in percentage
B. resistance in ohms and power rating in watts
C. resistance in ohms and conductivity in mhos
D. resistance in ohms and power in joules
Difficulty: Medium
19. (p. 60) In electronic equipment, the resistor most commonly used is the
A. wire-wound
B. film-type
C. carbon-composition
D. carbon
Difficulty: Medium
02-14
Chapter 002 Resistors Key
20. (p. 60) What type of resistor is constructed by wrapping resistance wire around an insulating
core?
A. Carbon
B. Carbon-composition
C. Film-type
D. Wire-wound
Difficulty: Easy
21. (p. 61) What type of resistor is typically used as a precision resistor?
A. Carbon
B. Carbon-composition
C. Film-type
D. Wire-wound
Difficulty: Hard
22. (p. 61) What type resistor is formed by spraying a thin film of metal onto a ceramic substrate
and then cut in the form of a spiral?
A. Carbon
B. Wire-wound
C. Carbon composition
D. Metal-film
Difficulty: Easy
23. (p. 62) What is the resistor called that is designed to burn open easily when the power rating
is exceeded?
A. Thermistor
B. Varistor
C. Fusible
D. Chip
Difficulty: Easy
02-15
Chapter 002 Resistors Key
24. (p. 62) A resistor whose resistance value changes with changes in operating temperature is a
A. thermistor
B. varistor
C. fusible
D. chip
Difficulty: Medium
25. (p. 63) What type resistor is frequently used in electronic circuits in which it is desired to
provide temperature control?
A. Thermocouple
B. Thermodynamic
C. Thermistor
D. Varistor
Difficulty: Medium
26. (p. 64) If a resistor is color-coded red, blue, and orange, what is its resistance value?
A. 2500 ohms
B. 2600 ohms
C. 26,000 ohms
D. 260 ohms
Difficulty: Medium
27. (p. 64) The amount by which the actual resistance can differ from the color-coded value is
the:
A. power rating
B. temperature coefficient
C. tolerance
D. differential resistance
Difficulty: Medium
02-16
Chapter 002 Resistors Key
28. (p. 66) A resistor with a single black band around the center of the resistor body has a
resistance of
A. one
B. zero
C. 1000
D. infinity
Difficulty: Hard
29. (p. 66) The resistance value of a chip resistor is determined from the
A. color-code
B. size of the resistor
C. three digit number printed on the film or body
D. three letters printed on the body
Difficulty: Hard
30. (p. 67) Variable resistors can be wire-wound or
A. carbon type
B. metal-film type
C. fusible
D. zero resistance type
Difficulty: Medium
31. (p. 68) The way resistance varies with shaft rotation in a variable resistor is called the
A. variable of the control
B. variance of the control
C. rheostat
D. taper of the control
Difficulty: Medium
02-17
Chapter 002 Resistors Key
32. (p. 68) A device that is used to provide any one resistance within a wide range of values is a
A. varistor
B. decade box
C. fusible resistor
D. decimal box
Difficulty: Easy
33. (p. 68) Rheostats and potentiometers are referred to as
A. amplifiers
B. fixed resistors
C. variable resistors
D. fusible resistors
Difficulty: Easy
34. (p. 69) A potentiometer has
A. one terminal
B. two terminals
C. three terminals
D. four terminals
Difficulty: Easy
35. (p. 69) A variable resistance with two terminals that is connected in series with the load is a
A. potentiometer
B. rheostat
C. tunable transformer
D. varistor
Difficulty: Easy
02-18
Chapter 002 Resistors Key
36. (p. 69) What resistive device is generally used to control relatively large values of current in
low-resistance circuits for ac power applications?
A. Fusible resistor
B. Potentiometer
C. Rheostat
D. Zero-ohm resistor
Difficulty: Medium
37. (p. 70) Commercial rheostats are typically
A. wire-wound, high wattage resistors
B. wire-wound, low wattage resistors
C. carbon, high wattage resistors
D. metal-film, low wattage resistors
Difficulty: Medium
38. (p. 71) The power rating is a property of a resistor that depends on the resistor's
A. color-code
B. size
C. function in a circuit
D. composition
Difficulty: Medium
39. (p. 71) For ambient temperatures greater than 70C, the power rating of a resistor must be
A. increased
B. derated
C. doubled
D. held constant
Difficulty: Hard
02-19
Chapter 002 Resistors Key
40. (p. 72) When not used, resistors generally keep their characteristics
A. for about one week
B. for about one year
C. almost indefinitely
D. between one to two years
Difficulty: Medium
41. (p. 72) The most common trouble in resistors is
A. an open
B. a short
C. leakage
D. lower than listed tolerance
Difficulty: Medium
42. (p. 72) What is indicated when a volume or tone control makes a scratchy noise as the shaft
is rotated?
A. Shorted resistance element
B. Open resistance element
C. Worn or dirty resistance element
D. Wrong resistance value
Difficulty: Easy
43. (p. 72) Resistance is measured with a(n)
A. oscilloscope
B. ohmmeter
C. ammeter
D. voltmeter
Difficulty: Easy
02-20
Chapter 002 Resistors Key
44. (p. 72) As measured with an ohmmeter, infinite ohms means
A. an open circuit
B. a shorted circuit
C. low resistance
D. zero resistance
Difficulty: Easy
45. (p. 73) What may cause a much lower resistance value to be displayed on an ohmmeter
when checking resistance in a circuit?
A. Low batteries in the ohmmeter
B. The circuit power is on
C. Parallel resistance paths
D. Open resistors
Difficulty: Medium
46. (p. 73) Aging, which is normal resistor heating over a long period of time causes the resistor
to exceed its
A. power rating
B. derating factor
C. shelf life
D. tolerance
Difficulty: Hard
Fill in the Blank Questions
47. (p. 60) Resistors with higher resistance values usually have ______________ wattage
ratings.
lower
Difficulty: Easy
02-21
Chapter 002 Resistors Key
48. (p. 61) Since they are generally used for high-current applications, ______________
resistors are available in wattage ratings from 1W up to 100W or more.
wire-wound
Difficulty: Medium
49. (p. 62) ______________-mount resistors are constructed by depositing a thick carbon film
on a ceramic base.
Surface
Difficulty: Medium
50. (p. 62) A ______________ resistor is a wire-wound resistor made to burn open easily when
the power rating is exceeded.
fusible
Difficulty: Easy
02-22