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Full file at http://testbank360.eu/test-bank-grobs-basic-electronics-11th-edition-schultz 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 70C, 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 70C, 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