MCQOPTIONS
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MCQOPTIONS
This section includes 110 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 102. |
The Hall voltage is the voltage created by a conductor moving through a magnetic field. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 103. |
The movable part in a relay is the _____. |
| A. | plunger |
| B. | armature |
| C. | cone |
| D. | brushes |
| Answer» C. cone | |
| 104. |
The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 105. |
The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2. |
| A. | 1800 µT |
| B. | 555.56 T |
| C. | 9 µT |
| D. | 5 × 10–3 T |
| Answer» B. 555.56 T | |
| 106. |
When the current through a coil reverses direction, the magnetic field around the coil _____. |
| A. | does not change |
| B. | disappears |
| C. | increases in strength |
| D. | reverses direction |
| Answer» E. | |
| 107. |
The Hall effect |
| A. | is a phenomenon with no practical applications |
| B. | is used in various sensor applications |
| C. | can develop potentials of thousands of volts |
| D. | is the basis for solar cell operation |
| Answer» C. can develop potentials of thousands of volts | |
| 108. |
The unit of magnetic flux density is the weber. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 109. |
How much flux is there in a magnetic field when its flux density is 5000 T and its cross-sectional area is 300 mm2? |
| A. | 16.67 mWb |
| B. | 5.0 Wb |
| C. | 3.0 mWb |
| D. | 1.5 Wb |
| Answer» E. | |
| 110. |
What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2? |
| A. | 12,000 T |
| B. | 83,330 T |
| C. | 0 T |
| D. | More information is needed in order to find flux density. |
| Answer» B. 83,330 T | |