MCQOPTIONS
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MCQOPTIONS
This section includes 99 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If a variable resistor's resistance varies in a nonuniform manner as the shaft is moved, it is considered to be: |
| A. | linear |
| B. | defective |
| C. | not wirewound |
| D. | tapered |
| Answer» E. | |
| 52. |
How is power dissipated in a resistor? |
| A. | by resistance |
| B. | by voltage |
| C. | by current |
| D. | by heat |
| Answer» E. | |
| 53. |
The six basic forms of energy are: |
| A. | light, sun, magnetic, chemical, electrical, and mechanical |
| B. | electrical, mechanical, light, heat, magnetic, and chemical |
| C. | electrical, mechanical, sun, heat, chemical, and light |
| D. | potential, sun, light, chemical, electrical, and mechanical |
| Answer» C. electrical, mechanical, sun, heat, chemical, and light | |
| 54. |
If resistance decreases, then current will: |
| A. | decrease |
| B. | increase |
| C. | remain the same |
| D. | double |
| Answer» C. remain the same | |
| 55. |
The source is 24 volts and the load resistance is 100 . What is the load current? |
| A. | 2.4 A |
| B. | 240 mA |
| C. | 24 mA |
| D. | 2.4 mA |
| Answer» C. 24 mA | |
| 56. |
Resistance is: |
| A. | the opposition to current flow accompanied by the dissipation of heat |
| B. | symbolized by R, measured in ohms, and directly proportional to conductance |
| C. | directly proportional to current and voltage |
| D. | represented by the flow of fluid in the fluid circuit |
| Answer» B. symbolized by R, measured in ohms, and directly proportional to conductance | |
| 57. |
Carbon composition resistors are the most common and the least expensive type of fixed-value resistor. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 58. |
Good insulators: |
| A. | have few electrons in their outer shells |
| B. | have a large dielectric strength |
| C. | have a small breakdown voltage |
| D. | have many electrons in the nucleus |
| Answer» C. have a small breakdown voltage | |
| 59. |
What are the two major categories for resistors? |
| A. | low and high ohmic value |
| B. | commercial and industrial |
| C. | low and high power value |
| D. | fixed and variable |
| Answer» E. | |
| 60. |
With Ohm's law: |
| A. | current is inversely proportional to resistance |
| B. | resistance is directly proportional to voltage |
| C. | voltage is indirectly proportional to power |
| D. | current is directly proportional to resistance |
| Answer» B. resistance is directly proportional to voltage | |
| 61. |
Resistance limits the flow of current. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 62. |
Ohm's law is not: |
| A. | V = IR |
| B. | I = V/R |
| C. | R = IV |
| D. | R = V/I |
| Answer» D. R = V/I | |
| 63. |
A 33 k resistor with a 20% tolerance checks out as ok with which of the following ohmmeter readings? |
| A. | 26400 ohms |
| B. | 24183 ohms |
| C. | 6600 ohms |
| D. | 39970 ohms |
| Answer» B. 24183 ohms | |
| 64. |
How many connections does a potentiometer have? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 65. |
4 amperes will flow through a 10 resistor if 20 volts are placed across the resistor. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 66. |
The word work means that: |
| A. | energy has been transferred |
| B. | it is inversely related to energy |
| C. | no energy has been transferred |
| D. | work and energy are not related |
| Answer» B. it is inversely related to energy | |
| 67. |
Power is measured in units of: |
| A. | joules x charge |
| B. | joules/work |
| C. | joules x voltage |
| D. | joules/time |
| Answer» E. | |
| 68. |
Resistance in a circuit is: |
| A. | opposition to current |
| B. | opposition to voltage |
| C. | the same as current |
| D. | the same as voltage |
| Answer» B. opposition to voltage | |
| 69. |
If a calculator display was "0.00263," what would this answer be in percent? |
| A. | 0.0003 |
| B. | 0.0026 |
| C. | 0.0263 |
| D. | 0.263 |
| Answer» C. 0.0263 | |
| 70. |
A good fuse will have: |
| A. | zero ohms resistance |
| B. | a medium resistance |
| C. | a high resistance |
| D. | an infinite resistance |
| Answer» B. a medium resistance | |
| 71. |
Electrical equipment is protected against excessive current by a(n): |
| A. | fusible wire link |
| B. | insulated glass container |
| C. | metal ended coil |
| D. | circuit opener |
| Answer» B. insulated glass container | |
| 72. |
If 500 mA is flowing through a 10 resistor, the wattage rating of the resistor should be 2 watts. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 73. |
Resistors are identified as to wattage by: |
| A. | size |
| B. | color code |
| C. | types of materials |
| D. | internal construction |
| Answer» B. color code | |
| 74. |
A digital voltmeter can be used to measure resistance. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 75. |
The unit designator for resistance value is the: |
| A. | ampere |
| B. | ohm |
| C. | volt |
| D. | watt |
| Answer» C. volt | |
| 76. |
Wirewound resistors are usually used in circuits that have: |
| A. | high current |
| B. | negative temperature coefficients |
| C. | low power |
| D. | high voltage |
| Answer» B. negative temperature coefficients | |
| 77. |
Resistor tolerance is either printed on the component, or is provided by: |
| A. | keyed containers |
| B. | size |
| C. | color code |
| D. | ohmmeter reading |
| Answer» D. ohmmeter reading | |
| 78. |
A potentiometer has how many leads? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 79. |
An ohmmeter uses an internal battery to measure the resistance of a resistor. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 80. |
For P = V2/R, a decrease in resistance should produce: |
| A. | a decrease in power |
| B. | an increase in ohms |
| C. | an increase in power |
| D. | a decrease in current |
| Answer» D. a decrease in current | |
| 81. |
After a lamp is turned on, its filament resistance will change to become: |
| A. | less resistive |
| B. | cooler |
| C. | brighter |
| D. | more resistive |
| Answer» E. | |
| 82. |
One problem with mechanically variable resistors is noticeable in audio circuits as: |
| A. | scratchy noise |
| B. | lack of bass response |
| C. | variable volume |
| D. | too much treble response |
| Answer» B. lack of bass response | |
| 83. |
Which type of test equipment is used to measure resistors? |
| A. | ohmmeter |
| B. | ammeter |
| C. | voltmeter |
| D. | watt meter |
| Answer» B. ammeter | |
| 84. |
A rheostat is ___. |
| A. | a two-terminal device that controls current |
| B. | a three-terminal device that controls current |
| C. | a two-terminal device that divides voltage |
| D. | a three-terminal device that divides voltage |
| Answer» B. a three-terminal device that controls current | |
| 85. |
If a metallic conductor has a positive temperature coefficient of resistance, then: |
| A. | as temperature increases, resistance decreases |
| B. | as current increases, resistance decreases |
| C. | as voltage increases, current increases |
| D. | as temperature increases, resistance increases |
| Answer» E. | |
| 86. |
What is the most commonly used conductor in electronics? |
| A. | aluminum |
| B. | copper |
| C. | gold |
| D. | silver |
| Answer» C. gold | |
| 87. |
How many connections does a rheostat have? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 88. |
With Ohm's law, if voltage increases and resistance stays the same: |
| A. | current remains the same |
| B. | power decreases |
| C. | current increases |
| D. | resistance decreases |
| Answer» D. resistance decreases | |
| 89. |
A 22-gauge wire will have a diameter in mils of: |
| A. | 10.03 |
| B. | 22.35 |
| C. | 45.26 |
| D. | 71.96 |
| Answer» C. 45.26 | |
| 90. |
What current is flowing in the circuit? |
| A. | 288 kA |
| B. | 2 kA |
| C. | 50 mA |
| D. | 500 A |
| Answer» E. | |
| 91. |
With 1 mA of current, what wattage rating should a 470 ohm resistor have? |
| A. | 1/4 watt |
| B. | 1/2 watt |
| C. | 1 watt |
| D. | 2 watts |
| Answer» B. 1/2 watt | |
| 92. |
A 12-volt battery is delivering 3 amperes to a resistor. The power dissipated by the resistor is 4 watts. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 93. |
How many amps are used by a 100 watt, 120 volt light bulb? |
| A. | 1.2 amps |
| B. | 12000 amps |
| C. | 830 mA |
| D. | 12 amps |
| Answer» D. 12 amps | |
| 94. |
One ampere of current flowing through one ohm of resistance is equal to: |
| A. | 1 horsepower |
| B. | 1 Btu |
| C. | 1 watt |
| D. | 1 joule |
| Answer» D. 1 joule | |
| 95. |
How is a 3.9 k resistor color-coded? |
| A. | red, white, red, gold |
| B. | red, green, orange, silver |
| C. | orange, white, red, gold |
| D. | orange, green, orange, silver |
| Answer» D. orange, green, orange, silver | |
| 96. |
How do fixed resistors usually fail? |
| A. | slowly over time |
| B. | by increasing their value |
| C. | by becoming an open circuit |
| D. | by increasing their value and becoming an open circuit |
| Answer» D. by increasing their value and becoming an open circuit | |
| 97. |
Which formula shows a direct proportionality between power and voltage? |
| A. | V = IR |
| B. | P = VI |
| C. | P = IR |
| D. | I = V/R |
| Answer» C. P = IR | |
| 98. |
How many basic types of resistors exist? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 99. |
The resistivity of copper is: |
| A. | 9.9 |
| B. | 10.7 |
| C. | 16.7 |
| D. | 17 |
| Answer» C. 16.7 | |