McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 151. |
Which of the following is most often used for dry magnetic particle inspection: |
| A. | Full cycle direct current |
| B. | Half wave rectified alternating current |
| C. | High voltage, low amperage current |
| D. | Direct current from electrolytic cells |
| Answer» B. Half wave rectified alternating current | |
| 152. |
When a magnetic field is induced in a part with prods spaced 150mm apart, the field is: |
| A. | Solenoidal |
| B. | Circular |
| C. | Longitudinal |
| D. | Distorted trapezoidal |
| Answer» B. Circular | |
| 153. |
With current flowing from + to - in a coil, a longitudinal field is created. Which of the following may be used to establish the direction of the magnetic field? |
| A. | Left hand rule |
| B. | Right hand rule |
| C. | Ohms law |
| D. | There is no relevant law |
| Answer» B. Right hand rule | |
| 154. |
Which form of magnetisation is easiest to control in most parts? |
| A. | Longitudinal magnetisation |
| B. | Permanent magnetism |
| C. | Circular magnetization |
| D. | Parallel magnetization |
| Answer» A. Longitudinal magnetisation | |
| 155. |
The strength of a magnetic field within a coil is determined by: |
| A. | The current in the coil |
| B. | The number of turns in the coil\ |
| C. | The diameter of the coil |
| D. | All of the above factors |
| Answer» D. All of the above factors | |
| 156. |
The field in a section of pipe being magnetised by means of a central conductor is stronger at: |
| A. | The ends of the pipe |
| B. | The outer surface of the pipe |
| C. | The inside surface of the pipe |
| D. | The middle of the pipe wall |
| Answer» C. The inside surface of the pipe | |
| 157. |
The space within and surrounding a magnetized part of a conductor carrying a current is known as: |
| A. | Saturation point |
| B. | Magnetic field |
| C. | Ferromagnetic |
| D. | Paramagnetic |
| Answer» B. Magnetic field | |
| 158. |
Subjecting the part to a magnetic field that is constantly reversing in polarity and gradually diminishing in strength accomplishes which of the following: |
| A. | Magnetises the part |
| B. | Removes residual field from the part |
| C. | Soaks in the flux density |
| D. | Helps find deep lying defects |
| Answer» B. Removes residual field from the part | |
| 159. |
The type of method most frequently used with mobile equipment is the: |
| A. | Indirect induction method |
| B. | Wet method with auxiliary tank |
| C. | Yoke method |
| D. | Dry magnetic particle powder method |
| Answer» D. Dry magnetic particle powder method | |
| 160. |
Which of the following is NOT a liquid vehicle in which particles are suspended in magnetic particle testing: |
| A. | Water treated with a wetting agent |
| B. | Kerosene |
| C. | Gasoline |
| D. | Water treated with antifoam |
| Answer» C. Gasoline | |
| 161. |
The most common cause of non relevant indications in MT is: |
| A. | Over magnetisation |
| B. | Low amperage |
| C. | High flux density |
| D. | Under magnetisation |
| Answer» A. Over magnetisation | |
| 162. |
When a ferromagnetic material is in an unmagnetized state, the domains are: |
| A. | Aligned in a North and South direction |
| B. | Aligned in an East West direction |
| C. | Randomly organized |
| D. | Balanced to produce a gauss rating of 2 |
| Answer» C. Randomly organized | |
| 163. |
Paramagnetic materials: |
| A. | Are commonly inspected using magnetic particle testing |
| B. | Are affected by magnetic fields |
| C. | Cannot be magnetized |
| D. | Have low reluctance to establishment of magnetic flux |
| Answer» B. Are affected by magnetic fields | |
| 164. |
What type of magnetization uses the formula: I = 45000/(L/D)N where I is the current in Amperes, N the number of turns of the magnetizing coil, L the length of the cylindrical test piece and D its diameter. |
| A. | Circular |
| B. | Longitudinal |
| C. | Swinging field |
| D. | Central conductor |
| Answer» B. Longitudinal | |
| 165. |
The magnetic field is the strongest when: |
| A. | The magnetising current is flowing |
| B. | The magnetising voltage is applied |
| C. | The leakage field is flowing |
| D. | The magnetising current is off |
| Answer» A. The magnetising current is flowing | |
| 166. |
The retentivity of a material describes: |
| A. | The length of time required to demagnetise it |
| B. | The depth of the magnetic field in the part |
| C. | The ability to retain the magnetic field |
| D. | The ease with which it can be demagnetized |
| Answer» C. The ability to retain the magnetic field | |
| 167. |
A material with a wider hysteresis loop has: |
| A. | Lower reluctance |
| B. | Lower residual magnetism |
| C. | Higher residual magnetism |
| D. | Higher permeability |
| Answer» C. Higher residual magnetism | |
| 168. |
The unit usually used to denote flux density is the: |
| A. | Henry |
| B. | Angstrom |
| C. | Gauss |
| D. | Ampere |
| Answer» C. Gauss | |
| 169. |
Which technique is the most sensitive? |
| A. | Residual |
| B. | Continuous |
| C. | Permanent |
| D. | Interrupted |
| Answer» B. Continuous | |
| 170. |
What rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor? |
| A. | Left hand rule |
| B. | Right hand rule |
| C. | Flux density rule |
| D. | Reluctance rule |
| Answer» B. Right hand rule | |
| 171. |
The opposition that a ferromagnetic material shows to the establishment of a magnetic field is called: |
| A. | Retentivity |
| B. | Reluctance |
| C. | Coercive force |
| D. | Permeability |
| Answer» B. Reluctance | |
| 172. |
The magnetism which remains in a piece of magnetisable material after the magnetising force has been removed is called the: |
| A. | Tramp field |
| B. | Residual field |
| C. | Damped field |
| D. | Permanent field |
| Answer» B. Residual field | |
| 173. |
A material with a narrower hysteresis loop has: |
| A. | Higher permeability |
| B. | Lower retentivity |
| C. | Lower coercive force |
| D. | All of the above |
| Answer» D. All of the above | |
| 174. |
The correct number of ampere-turns for a given test specimen is determined by: |
| A. | Its length |
| B. | The material and its diameter |
| C. | Both the length and the material |
| D. | Its diameter and length |
| Answer» D. Its diameter and length | |
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