McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 401. |
Prods are being used to magnetize a weld area. When dry powder is dusted on the surface, it is observed that there is no mobility of the particles. What is the most probable reason for this observation? |
| A. | The magnetizing current is not high enough |
| B. | The flux density is too low |
| C. | DC is being used |
| D. | All of the above are possible reasons |
| Answer» D. All of the above are possible reasons | |
| 402. |
The current from portable high amperage units can be applied to the object using: |
| A. | Prods |
| B. | Cable coils |
| C. | Pre-wrapped coils |
| D. | All of the above |
| Answer» D. All of the above | |
| 403. |
How can parts be tested to determine if they have been adequately demagnetized? |
| A. | By bringing a suspended paper clip near the middle of the part |
| B. | By using a small horseshoe permanent magnet |
| C. | By using a small magnetometer held at a corner of the part |
| D. | By sprinkling some magnetic particles on the part |
| Answer» C. By using a small magnetometer held at a corner of the part | |
| 404. |
The statement ‘magnetic particle testing can be applied to plated and painted parts’. |
| A. | May be true depending upon the thickness of the coating |
| B. | May be true if flux densities are increased to compensate for the coating thickness |
| C. | Is true only for circular circumstances |
| D. | Both (a) and (b) |
| Answer» A. May be true depending upon the thickness of the coating | |
| 405. |
A group of indications, some sharp and some broad and fuzzy, were found on an area of a small forging. Demagnetization and re-inspection eliminated these indications. What was the probable cause? |
| A. | Forging lap |
| B. | Magnetic writing |
| C. | Change in permeability |
| D. | Subsurface variation |
| Answer» B. Magnetic writing | |
| 406. |
Magnetic particle testing is most likely to find subsurface discontinuities in: |
| A. | Soft steels with high permeability |
| B. | Soft steels with low permeability |
| C. | Hardened steels with low permeability |
| D. | Hardened steels with high permeability |
| Answer» A. Soft steels with high permeability | |
| 407. |
Which of the following is not an advantage of Magnetic Particle testing? |
| A. | Fast and simple to perform |
| B. | Can detect discontinuities filled with foreign material |
| C. | Most reliable for finding surface cracks in all types of material |
| D. | Works well through a thin coat of paint |
| Answer» C. Most reliable for finding surface cracks in all types of material | |
| 408. |
The most effective NDT method for locating surface cracks in ferromagnetic materials is: |
| A. | Ultrasonic testing |
| B. | Radiographic testing |
| C. | Magnetic particles testing |
| D. | Liquid penetrant testing |
| Answer» C. Magnetic particles testing | |
| 409. |
Opposition to establishment of a magnetic field in a test piece is called: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» A. Reluctance | |
| 410. |
A leakage field is strongest when a discontinuity interrupts the magnetic flux lines at an angle of: |
| A. | 0o |
| B. | 45o |
| C. | 90o |
| D. | 180o |
| Answer» C. 90o | |
| 411. |
A common rule of thumb to use for current required in circular magnetisation: |
| A. | 1000 amps/25 mm of diameter |
| B. | 1000 ampere-turns/25 mm of diameter |
| C. | 1000 amps/25 mm of prod spacing |
| D. | None of the above |
| Answer» A. 1000 amps/25 mm of diameter | |
| 412. |
The formula, NI = 45000/(L/D), is used to calculate the proper magnetising current for: |
| A. | Prod magnetisation |
| B. | A head shot |
| C. | A central conductor |
| D. | Coil magnetization |
| Answer» D. Coil magnetization | |
| 413. |
For direct contact magnetising methods, the magnetic field is oriented in what direction relative to the current direction? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» C. At 90o | |
| 414. |
For direct contact magnetising methods, current should be flowing in what direction relative to expected discontinuities? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» A. Parallel | |
| 415. |
What is the magnetic field strength at the surface of a 25 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» A. Twice | |
| 416. |
Demagnetization, ASTM E709-95 recommends a coil of ampere-turns: |
| A. | 1000 to 3000 |
| B. | 3000 to 5000 |
| C. | 5000 to 10000 |
| D. | 10000 to 15000 |
| Answer» C. 5000 to 10000 | |
| 417. |
According to ASTM E709-95 when dry particles are used magnetic particle testing shall not be performed on the surface of parts whose temperature exceeds: |
| A. | 57ºC |
| B. | 79ºC |
| C. | 158ºC |
| D. | 136ºC |
| Answer» A. 57ºC | |
| 418. |
According to ASTM E709-95 in using prod technique, prod spacing shall not exceed: |
| A. | 50 mm |
| B. | 100 mm |
| C. | 150 mm |
| D. | 200 mm |
| Answer» D. 200 mm | |
| 419. |
According to ASTM E709-95, the UV intensity shall not be less than: |
| A. | 600 µW/cm2 |
| B. | 700 µW/cm2 |
| C. | 800 µW/cm2 |
| D. | 900 µW/cm2 |
| Answer» C. 800 µW/cm2 | |
| 420. |
According to ASTM E709-95 in using prod technique on a 50 mm thickness plate with a prod spacing of 101 mm (4 inches), current shall be selected in the following range: |
| A. | 300-450A |
| B. | 400-500 A |
| C. | 500-625A |
| D. | 550-700 A |
| Answer» A. 300-450A | |
| 421. |
According to ASMT E709-95 alternating current electromagnetic yokes should give a lifting force of at least: |
| A. | 1.5 kg |
| B. | 2.5 kg |
| C. | 3.5 kg |
| D. | 4.5 kg |
| Answer» D. 4.5 kg | |
| 422. |
According to ASTM E709-95 direct current electromagnetic yokes should have a lifting force of at least: |
| A. | 15 kg |
| B. | 16 kg |
| C. | 17 kg |
| D. | 18 kg |
| Answer» D. 18 kg | |
| 423. |
According to ASTM E709-95 the UV light shall be centred on (1 Å = 10-10m): |
| A. | 3000Å |
| B. | 3250 Å |
| C. | 3400Å |
| D. | 3650 Å |
| Answer» D. 3650 Å | |
| 424. |
According to ASTM E709-95 when fluorescent particles are used, the UV light intensity shall be above: |
| A. | 700 µW/cm2 |
| B. | 800 µW/cm2 |
| C. | 900 µW/cm2 |
| D. | 1000 µW/cm2 |
| Answer» D. 1000 µW/cm2 | |
| 425. |
According to ASTM E709-95 when fluorescent particles are used, the bulb shall be warmed up prior to use for at least: |
| A. | 1 min |
| B. | 2 min |
| C. | 3 min |
| D. | 4 min |
| Answer» D. 4 min | |
| 426. |
According to ASTM E709-95 with prod technique, the prods shall be tipped if the open circuit voltage is over: |
| A. | 10 V |
| B. | 15 V |
| C. | 20 V |
| D. | 25 V |
| Answer» D. 25 V | |
| 427. |
According to ASME Section VIII, a linear indication is defined as an indication in which the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 428. |
According to ASTM E709-95 the viscosity limit (measured in centi Stokes) of the wet medium (conditioned water) should not exceed: |
| A. | 1 cSt |
| B. | 3 cSt |
| C. | 6 cSt |
| D. | 4 cSt |
| Answer» C. 6 cSt | |
| 429. |
According to ASTM E709-95 when applying fluorescent magnetic particles technique, the operator shall be in darkness area at least......................prior to examination: |
| A. | 2 min |
| B. | 3 min |
| C. | 4 min |
| D. | 5 min |
| Answer» B. 3 min | |
| 430. |
According to ASTM E709-95 the alkalinity of conditioned water shall not exceed: |
| A. | 10.0 pH |
| B. | 10.5 pH |
| C. | 11.0 pH |
| D. | 11.5 pH |
| Answer» B. 10.5 pH | |
| 431. |
According to ASTM E709-95, with wet continuous magnetization technique, the duration of magnetization current is of the order of: |
| A. | 0.5 sec |
| B. | 1.0 sec |
| C. | 1.5 sec |
| D. | 2.0 sec |
| Answer» A. 0.5 sec | |
| 432. |
According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches) and above, the magnetizing current shall be: |
| A. | From 90 to 110 A/25 mm (1 inch) |
| B. | From 100 to 125 A/25 mm (1 inch) |
| C. | From 90 to 120 A/ 25 mm (1 inch) |
| D. | From 100 to 200 A/25 mm (1 inch) |
| Answer» B. From 100 to 125 A/25 mm (1 inch) | |
| 433. |
According to ASTM E709-95 powder shall be applied upon the part to be tested in such a manner that: |
| A. | A light uniform coating is formed |
| B. | In excess coating |
| C. | All of the above |
| D. | None of the above |
| Answer» A. A light uniform coating is formed | |
| 434. |
According to ASTM E709-95 before turning off current and examination, dry powder in excess shall be: |
| A. | Removed by a dry-air current |
| B. | Kept in place |
| C. | All of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 435. |
According to ASTM E709-95 demagnetization can be performed by: |
| A. | Decreasing alternating current |
| B. | Reversing direct current |
| C. | All of the above |
| D. | None of the above |
| Answer» C. All of the above | |
| 436. |
According to ASTM E709-95, Table 3., alternating current electromagnetic yokes must have a lifting force of at least: |
| A. | 3.0 kg (7 lb) |
| B. | 3.5 kg (8 lb) |
| C. | 4.0 kg (9 lb) |
| D. | 4.5 kg (10 lb) |
| Answer» D. 4.5 kg (10 lb) | |
| 437. |
According to ASTM E709-95, Table 3., direct current electromagnetic yokes must have a lifting force of at least: |
| A. | 15 kg (33 lb) |
| B. | 16 kg (36 lb) |
| C. | 17 kg (38 lb) |
| D. | 18 kg (40 lb) |
| Answer» D. 18 kg (40 lb) | |
| 438. |
According to API, the acceptable particle concentration of wet particle solution for fluorescent particles is: |
| A. | 0.1 to 0.4 mL by volume |
| B. | 0.1 to 0.5 mL by volume |
| C. | 0.1 to 0.6 mL by volume |
| D. | 0.1 to 0.7 mL by volume |
| Answer» A. 0.1 to 0.4 mL by volume | |
| 439. |
According to API, the particle concentration of wet particle solution must be checked: |
| A. | Prior to each shift |
| B. | Only after each shift |
| C. | Only each week |
| D. | Only each two weeks |
| Answer» A. Prior to each shift | |
| 440. |
According to ASTM E709-95 and API, the UV intensity measured at a minimum of 38 cm (15 inches) at least shall not be less than: |
| A. | 700 µW/cm2 |
| B. | 800 µW/cm2 |
| C. | 900 µW/cm2 |
| D. | 1000 µW/cm2 |
| Answer» D. 1000 µW/cm2 | |
| 441. |
According to ASTME 709-95 and API, in order to eliminate all contaminants, an appropriate cleaning shall be performed on all the surfaces to be examined and on a minimum of adjacent material: |
| A. | 25.4 mm (1 inch) |
| B. | 31.7 mm (5/4 inches) |
| C. | 38.1 mm (1.5 inches) |
| D. | 44.5 mm (7/4 inches) |
| Answer» A. 25.4 mm (1 inch) | |
| 442. |
According to ASTM E709-95 and API, the temperature of the dry particles can be usable up to: |
| A. | 38ºC |
| B. | 2000ºC |
| C. | 49ºC |
| D. | 315ºC |
| Answer» D. 315ºC | |
| 443. |
According to ASTM E709-95 and API, the thickness of non conductive coatings will not exceed: |
| A. | 1-10 mm |
| B. | 2-5 mm |
| C. | 0.02-0.05 mm |
| D. | 0.001-0.004 mm |
| Answer» C. 0.02-0.05 mm | |
| 444. |
According to ASTM E709-95 and API, relevant indications are produced by: |
| A. | Greasy surfaces |
| B. | Excessive background |
| C. | Leakage fields |
| D. | Rotating Eddy currents |
| Answer» C. Leakage fields | |
| 445. |
According to ASTM E709-95 and API, when fluorescent particles are used, the UV bulb shall warm up prior to use for at least: |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» D. 5 minutes | |
| 446. |
According to AST M E709-95 and API, after removing magnetization of parts after examination, the residual magnetism shall not exceed (1 gauss = 0.0001 tesla): |
| A. | 3 × 10-4T (3gauss) |
| B. | 4 × 10-4T (4 gauss) |
| C. | 6 × 10-4T (6gauss) |
| D. | 8 × 10-4T (8 gauss) |
| Answer» A. 3 × 10-4T (3gauss) | |
| 447. |
According to ASTM E709-95 and API, a linear indication is defined as an indication in which the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 448. |
According to API, a non- relevant indication is defined as an indication which in the major dimension is equal to, or less than: |
| A. | 1.59 mm (1/16 inches) |
| B. | 2.4 mm (3/32 inches) |
| C. | 3.2 mm (1/18 inches) |
| D. | 4 mm (5/32 inches) |
| Answer» A. 1.59 mm (1/16 inches) | |
| 449. |
Which of the following types of intensifying screens are not used in industrial radiography? |
| A. | Lead |
| B. | Fluorescent |
| C. | Silver halide |
| D. | All of the above |
| Answer» C. Silver halide | |
| 450. |
Betatrons are used to produce X rays in what range? |
| A. | Several MeV |
| B. | 50-500 keV |
| C. | 500-1000keV |
| D. | 0-50 keV |
| Answer» A. Several MeV | |
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