MCQOPTIONS
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MCQOPTIONS
This section includes 217 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is the correct expression for the rms value of current? |
| A. | Irms=Im/2 |
| B. | Irms=Im/√2 |
| C. | Irms=Im/4 |
| D. | Irms=Im |
| Answer» C. Irms=Im/4 | |
| 52. |
If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value? |
| A. | i=Im/2 |
| B. | i=Imsinθ |
| C. | i=Imcosθ |
| D. | i=Imsinθ or i=Imcosθ |
| Answer» E. | |
| 53. |
Average value of current over a half cycle is? |
| A. | 0.67Im |
| B. | 0.33Im |
| C. | 6.7Im |
| D. | 3.3Im |
| Answer» B. 0.33Im | |
| 54. |
What is the correct relation between the peak value and peak to peak value for a sinusoidal waveform? |
| A. | Vp=4Vp-p |
| B. | Vp=Vp-p |
| C. | Vp-p=2Vp |
| D. | Vp=2Vp-p |
| Answer» D. Vp=2Vp-p | |
| 55. |
If the peak to peak voltage is 10V, calculate the peak voltage. |
| A. | 10V |
| B. | 2V |
| C. | 4V |
| D. | 5V |
| Answer» E. | |
| 56. |
The maximum variation between the maximum positive and the maximum negative value is known as? |
| A. | Peak value |
| B. | Peak to peak value |
| C. | Cycle |
| D. | Period |
| Answer» C. Cycle | |
| 57. |
The maximum instantaneous value measured from zero value is known as? |
| A. | Peak value |
| B. | Peak to peak value |
| C. | Cycle |
| D. | Period |
| Answer» B. Peak to peak value | |
| 58. |
The value of a given waveform at any instant time is termed as ___________ |
| A. | Waveform |
| B. | Instantaneous value |
| C. | Cycle |
| D. | Period |
| Answer» C. Cycle | |
| 59. |
Average value of current over a full cycle is? |
| A. | 0.67Im |
| B. | 0 |
| C. | 6.7Im |
| D. | 3.3Im |
| Answer» C. 6.7Im | |
| 60. |
What is the value of the form factor for sinusoidal current? |
| A. | π/2 |
| B. | π/4 |
| C. | 2π |
| D. | π/√2 |
| Answer» B. π/4 | |
| 61. |
For a direct current, the rms voltage is ________ the mean voltage. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Not related to |
| Answer» D. Not related to | |
| 62. |
For a direct current, the rms current is ________ the mean current. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Not related to |
| Answer» D. Not related to | |
| 63. |
What is the correct expression for the form factor? |
| A. | Iᵣₘₛ * Iₐᵥ |
| B. | Iᵣₘₛ / Iₐᵥ |
| C. | Iᵣₘₛ + Iₐᵥ |
| D. | Iᵣₘₛ – Iₐᵥ |
| Answer» C. Iᵣₘₛ + Iₐᵥ | |
| 64. |
The number of cycles that occur in one second is termed as ___________ |
| A. | Waveform |
| B. | Frequency |
| C. | Amplitude |
| D. | Period |
| Answer» C. Amplitude | |
| 65. |
In an A.C. generator, increase in number of turns in the coil _________ |
| A. | Increases emf |
| B. | Decreases emf |
| C. | Makes the emf zero |
| D. | Maintains the emf at a constant value |
| Answer» B. Decreases emf | |
| 66. |
What is the duration of one cycle known as _________ |
| A. | Waveform |
| B. | Peak value |
| C. | Instantaneous value |
| D. | Period |
| Answer» E. | |
| 67. |
The repetition of a variable quantity, recurring at equal intervals, is known as ___________ |
| A. | Waveform |
| B. | Instantaneous value |
| C. | Cycle |
| D. | Period |
| Answer» D. Period | |
| 68. |
The variation of a quantity such as voltage or current shown on a graph is known as ___________ |
| A. | Waveform |
| B. | Peak value |
| C. | Instantaneous value |
| D. | Period |
| Answer» B. Peak value | |
| 69. |
When a coil is rotated in a magnetic field, the emf induced in it? |
| A. | Is maximum |
| B. | Is minimum |
| C. | Continuously varies |
| D. | Remains constant |
| Answer» D. Remains constant | |
| 70. |
Calculate the maximum emf when the velocity is 10m/s, the length is 3m and the magnetic field density is 5T. |
| A. | 150V |
| B. | 100V |
| C. | 300V |
| D. | 0V |
| Answer» B. 100V | |
| 71. |
What should theta be in order to get maximum emf? |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 45° |
| Answer» C. 180° | |
| 72. |
Which, among the following, is the correct expression for alternating emf generated? |
| A. | e=2Blvsin(θ) |
| B. | e=2B²lvsin(θ) |
| C. | e=Blvsin(θ) |
| D. | e=4Blvsin(θ) |
| Answer» D. e=4Blvsin(θ) | |
| 73. |
emf is zero if the angle between velocity and length is _____ |
| A. | 0° |
| B. | 90° |
| C. | 270° |
| D. | 45° |
| Answer» B. 90° | |
| 74. |
A multimeter measures |
| A. | Current |
| B. | Voltage |
| C. | Resistance |
| D. | Current, voltage, and resistance |
| Answer» E. | |
| 75. |
Resistance limits the current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 76. |
A neutral atom with an atomic number of five has how many electrons? |
| A. | 1 |
| B. | 5 |
| C. | None |
| D. | Depends on the type of atom |
| Answer» C. None | |
| 77. |
If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s? |
| A. | 10.5 C |
| B. | 105 C |
| C. | 3.4 C |
| D. | 34 C |
| Answer» B. 105 C | |
| 78. |
The conductance of an 8 ohm resistance is |
| A. | 12.5 mS |
| B. | 8 mS |
| C. | 12 S |
| D. | 125 mS |
| Answer» E. | |
| 79. |
A free electron is a valence electron that has broken away from its parent atom. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 80. |
A thermistor is a type of |
| A. | Switch |
| B. | Resistor |
| C. | Battery |
| D. | Power supply |
| Answer» C. Battery | |
| 81. |
Which of the following is not a type of energy source? |
| A. | Generator |
| B. | Rheostat |
| C. | Solar cell |
| D. | Battery |
| Answer» C. Solar cell | |
| 82. |
The maximum resistance value for a brown, red, yellow, gold resistor is |
| A. | 126,000 Ω |
| B. | 126,600 Ω |
| C. | 114,000 Ω |
| D. | 132,000 Ω |
| Answer» B. 126,600 Ω | |
| 83. |
A neutral atom is one with an equal number of protons and electrons. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 84. |
Free electrons make current possible. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 85. |
The colored bands for a 4,700 ohm resistor with a ten percent tolerance are |
| A. | Yellow, violet, red, gold |
| B. | Yellow, violet, orange, gold |
| C. | Yellow, violet, red, silver |
| D. | Orange, violet, red, silver |
| Answer» D. Orange, violet, red, silver | |
| 86. |
Materials with lots of free electrons are called |
| A. | Conductors |
| B. | Insulators |
| C. | Semiconductors |
| D. | Filters |
| Answer» B. Insulators | |
| 87. |
A circuit breaker is a |
| A. | Fuse |
| B. | Switch |
| C. | Resettable protective device |
| D. | Resistor |
| Answer» D. Resistor | |
| 88. |
When placed close together, two positively charged materials will |
| A. | Attract |
| B. | Become neutral |
| C. | Become negative |
| D. | Repel |
| Answer» E. | |
| 89. |
An open circuit is one that has a complete current path. |
| A. | True |
| B. | False |
| Answer» C. | |
| 90. |
An ammeter is an electrical instrument used to measure |
| A. | Current |
| B. | Voltage |
| C. | Resistance |
| D. | None of the above |
| Answer» B. Voltage | |
| 91. |
The current in a given circuit is not to exceed 24 A. Which value of fuse is best? |
| A. | A fuse is not necessary |
| B. | 10 A |
| C. | 24 A |
| D. | 20 A |
| Answer» D. 20 A | |
| 92. |
A potentiometer is a twoterminal variable resistor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 93. |
A material that does not allow current under normal conditions is a/an |
| A. | Insulator |
| B. | Conductor |
| C. | Semiconductor |
| D. | Valence |
| Answer» B. Conductor | |
| 94. |
A wiper is the sliding contact in a |
| A. | Switch |
| B. | Photoconductive cell |
| C. | Thermistor |
| D. | Potentiometer |
| Answer» E. | |
| 95. |
A twoterminal variable resistor is known as a |
| A. | Potentiometer |
| B. | Thermistor |
| C. | Rheostat |
| D. | Wiper |
| Answer» D. Wiper | |
| 96. |
A red, red, orange, gold resistor has a nominal value of |
| A. | 22,000 Ω |
| B. | 2,200 Ω |
| C. | 22 Ω |
| D. | 2.2 Ω |
| Answer» B. 2,200 Ω | |
| 97. |
An ohmmeter is an instrument for measuring |
| A. | Current |
| B. | Voltage |
| C. | Resistance |
| D. | Wattage |
| Answer» D. Wattage | |
| 98. |
The atomic number is the number of neutrons in the nucleus. |
| A. | True |
| B. | False |
| Answer» C. | |
| 99. |
The nominal value of a brown, black, yellow, and gold resistor is 100,000 ohms. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 100. |
Electrons in the outer orbit are called |
| A. | Nuclei |
| B. | Valences |
| C. | Waves |
| D. | Shells |
| Answer» C. Waves | |