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NDT Magnetic Particles Testing Level 1 (MT-1) General Examination latest Questions and Answers

1.

Magnetic particles testing is most likely to find subsurface discontinuities in:

 
 
 
 

2.

Which of the following is not an advantage of magnetic particles testing?

 
 
 
 

3.

Which of the following does not represent a limitation of magnetic particle testing?

 
 
 
 

4.

The most effective NDT method for locating surface cracks in ferromagnetic materials is:

 
 
 
 

5.

Which of the following may cause magnetic particle test indications?

 
 
 
 

6.

A discontinuity that is produced during solidification of the molten metal is called:

 
 
 
 

7.

The pipe would be classified as what type of discontinuity?

 
 
 
 

8.

A seam would be classified as what type of discontinuity?

 
 
 
 

9.

A lamination in steel plate would be classified as what type of discontinuity?

 
 
 
 

10.

An internal rupture caused by working steel at improper temperatures is called a:

 
 
 
 

11.

Cracks that are caused by alternating stresses above a critical level are called:

 
 
 
 

12.

Cracks that are caused by a combination of tensile stress and corrosion are called:

 
 
 
 

13.

Which of the following are ferromagnetic materials?

 
 
 
 

14.

The reverse magnetizing force necessary to remove a residual magnetic field from a test piece after it has been magnetically saturated is called:

 
 
 
 

15.

Magnetic lines of force enter and leave a magnet at:

 
 
 
 

16.

The ease with which a magnetic field can be established in a test piece is called:

 
 
 
 

17.

Opposition to the establishment of a magnetic field is called:

 
 
 
 

18.

The ability of a material to remain magnetic after the magnetizing force is removed is called:

 
 
 
 

19.

A magnetic field that is contained completely within the test piece is called a:

 
 
 
 

20.

Which of the following produces a circular field?

 
 
 
 

21.

A technique used to find transverse discontinuities at the ends of longitudinally magnetized bars by the use of transient currents is called:

 
 
 
 

22.

A leakage field is strongest when a discontinuity interrupts the magnetic flux lines at an angle of:

 
 
 
 

23.

The best method of inducing a circular field in a tube is by a:

 
 
 
 

24.

Magnetic flux density is zero at:

 
 
 
 

25.

Magnetic flux density is highest at:

 
 
 
 

26.

An important consideration when using a direct contact method is:

 
 
 
 

27.

A prod method would be most sensitive to cracks:

 
 
 
 

28.

When using prods, arc burns may be caused by which of the following?

 
 
 
 

29.

The important difference between AC and DC current for magnetic particle testing purposes is:

 
 
 
 

30.

The ‘skin’ effect would be most noticeable in which of the following?

 
 
 
 

31.

The most common source of DC current for magnetic particle testing is:

 
 
 
 

32.

Fields generated in ferromagnetic material with AC current are useful for locating:

 
 
 
 

33.

A common rule of thumb to use for current required in circular magnetization:

 
 
 
 

34.

The formula, NI = 45000/(L/D), is used to calculate the proper magnetizing current for:

 
 
 
 

35.

The formula, NI = 45000/(L/D), gives proper magnetizing current for a coil, regardless of coil size as long as:

 
 
 
 

36.

For direct contact magnetizing methods, the magnetic field is oriented in what direction relative to the current direction?

 
 
 
 

37.

For direct contact magnetizing methods, the current should be flowing in what direction relative to expected discontinuities?

 
 
 
 

38.

What is the magnetic field strength at the surface of a 100 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current?

 
 
 
 

39.

What is the magnetic field strength at the surface of a 25mm diameter bar as compared to that at the surface of a 50mm diameter bar, each carrying 1000 amps of current?

 
 
 
 

40.

The magnetic field outside a conductor decreases:

 
 
 
 

41.

How is the magnetic field strength at the surface of a magnetic conductor having permeability, µ, related to the magnetic field strength, F, at the surface of a nonmagnetic conductor carrying the same current?

 
 
 
 

42.

Compared to the magnetic field strength at the outer surface, the magnetic field strength, at the center of a hollow, nonmagnetic conductor carrying DC current is:

 
 
 
 

43.

How is the magnetic field strength, F, just outside a magnetic conductor having permeability, µ, related to that just outside a nonmagnetic conductor of the same size, carrying the same current?

 
 
 
 

44.

Which of the following describes the shape of particles used for dry magnetic particle testing?

 
 
 
 

45.

Which of the following particles would be most sensitive?

 
 
 
 

46.

Which of the following colors is readily available for magnetic particle test powder?

 
 
 
 

47.

A magnetic particle testing technique in which the test piece is magnetized and magnetic particles applied after the magnetizing force has been removed is called the:

 
 
 
 

48.

Which of the following characteristics would be most important in a test piece which is to be tested using the residual method?

 
 
 
 

49.

The wet method is superior to dry particles for detecting:

 
 
 
 

50.

Selection of magnetic particle color is based on:

 
 
 
 

51.

The residual method is applicable to:

 
 
 
 

52.

The highest sensitivity to fine surface cracks would be obtained by which of the following techniques?

 
 
 
 

53.

A residual field is always less than a continuous field because?

 
 
 
 

54.

Where possible, circular magnetization is preferable to longitudinal magnetization because:

 
 
 
 

55.

Which of the following is a disadvantage of the dry method?

 
 
 
 

56.

Which of the following is an advantage of the dry method?

 
 
 
 

57.

Loss of fine particle sizes due to re-use of dry particles would probably lead to:

 
 
 
 

58.

Which of the following is a disadvantage of the wet method?

 
 
 
 

59.

Which of the following is an advantage of the wet method?

 
 
 
 

60.

The primary reason for using water rather than oil as a suspension medium for wet method baths is that:

 
 
 
 

61.

A disadvantage of fluorescent magnetic particles is:

 
 
 
 

62.

A common physiological effect of black light inspection on the inspector is:

 
 
 
 

63.

A common physiological effect of black light inspection on the inspector is:

 
 
 
 

64.

Which of the following represents ultraviolet light of wavelengths which are potentially injurious (1 Å = 10-10m)?

 
 
 
 

65.

Dyes that receive light at one wavelength and re-emit light of another wavelength are called:

 
 
 
 

66.

Most fluorescent dyes used for magnetic particle testing fluoresce what color?

 
 
 
 

67.

The best available source of black light for inspection is:

 
 
 
 

68.

Which of the following would be likely to cause variations in the output of an inspection black light?

 
 
 
 

69.

The temperature above which steels become nonmagnetic is called the:

 
 
 
 

70.

The temperature above which most soft steels become nonmagnetic is about:

 
 
 
 

71.

The most common method of demagnetizing small test pieces is:

 
 
 
 

72.

Demagnetization with reversing DC is more effective than AC because:

 
 
 
 

73.

The type of discontinuity that magnetic particle testing most effectively locates is:

 
 
 
 

74.

An indication that is formed when two pieces of magnetized steel come in contact with each other is called:

 
 
 
 

75.

Magnetic particle test indications which are due to cold work can best be removed by:

 
 
 
 

76.

Which of the following might cause non-relevant indications?

 
 
 
 

77.

An inspection for surface and subsurface discontinuities in ferromagnetic welds would best be accomplished by which of the following techniques?

 
 
 
 

78.

A continuous linear indication along the center of a fillet weld would most likely be a:

 
 
 
 

79.

Wet magnetic particle bath strength is checked by which of the following?

 
 
 
 

80.

Which of the following describes the best technique for applying dry magnetic particles to a test piece?

 
 
 
 

81.

An advantage of AC equipment over DC is:

 
 
 
 

82.

When the orientation of likely discontinuities is unknown, what is the minimum number of magnetizing operations required to perform an adequate test?

 
 
 
 

83.

Maximum practical prod spacing is about:

 
 
 
 

84.

Magnetic lines of flux that are parallel to discontinuity produce:

 
 
 
 

85.

The area of maximum induced field strength using a yoke is:

 
 
 
 

86.

A minimum of external poles are produced by what type of magnetization?

 
 
 
 

87.

A split-coil would most likely be used with a:

 
 
 
 

88.

The most common harmful effect of exposure to black light is:

 
 
 
 

89.

Which of the following types of magnetic fields may be present without any external evidence?

 
 
 
 

90.

A residual circular field may be objectionable because:

 
 
 
 

91.

Which of the following is a disadvantage of magnetic particle testing?

 
 
 
 

92.

Magnetic Particles Testing Level 1 (MT-1) Specific Examination
The primary reason for using water rather than oil as a suspension medium for wet method baths is that

 
 
 
 

93.

Wet magnetic particle strength is checked by which of the following?

 
 
 
 

94.

A residual circular field may be objectionable because:

 
 
 
 

95.

A prod method would be most sensitive to cracks:

 
 
 
 

96.

The highest sensitivity to fine surface cracks would be obtained by which of the following techniques?

 
 
 
 

97.

Maximum practical prod spacing for a 2000 amp unit is about:

 
 
 
 

98.

Demagnetization with reversing DC is more effective than AC because:

 
 
 
 

99.

Fluorescent magnetic particle indications should be inspected under

 
 
 
 

100.

A discontinuity that is produced during solidification of the molten metal is called:

 
 
 
 

101.

Cracks that are caused by a combination of tensile stress and corrosion are called:

 
 
 
 

102.

The type of discontinuity potentially most harmful to the useful life of a part is:

 
 
 
 

103.

Magnetic particle test indications which are due to cold work can best be removed by:

 
 
 
 

104.

Which of the following might cause nonrelevant indications?

 
 
 
 

105.

A continuous linear indication along the edge of a new fillet weld would most likely be a:

 
 
 
 

106.

Ferromagnetic material is:

 
 
 
 

107.

The retentivity of a material describes:

 
 
 
 

108.

Which of the following can be magnetized?

 
 
 
 

109.

The magnetic field is strongest when:

 
 
 
 

110.

The unit usually used to denote flux density is the:

 
 
 
 

111.

Which statement is true when related to magnetic lines of force?

 
 
 
 

112.

Magnetic lines of force:

 
 
 
 

113.

The areas on a magnetised part from which the magnetic field is leaving or returning into the part are called:

 
 
 
 

114.

The magnetism which remains in a piece of magnetizable material after the magnetizing force has been removed is called the:

 
 
 
 

115.

Which technique is the most sensitive?

 
 
 
 

116.

The point at which the magnetism in a material cannot be increased even though the magnetizing force continues to increase is known as the:

 
 
 
 

117.

An electric current through a copper wire:

 
 
 
 

118.

A longitudinal surface crack in a circularly magnetized part will cause:

 
 
 
 

119.

The type of current that is best suited to detect surface discontinuities is:

 
 
 
 

120.

Retentivity:

 
 
 
 

121.

Demagnetization:

 
 
 
 

122.

What rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor?

 
 
 
 

123.

The proper number of ampere-turns for a given test specimen is determined by:

 
 
 
 

124.

An electrical yoke produces:

 
 
 
 

125.

In longitudinal magnetization the proper term for calculating magnetizing force is:

 
 
 
 

126.

The amount of amperage used for magnetic particle inspection using the prod method is determined from the:

 
 
 
 

127.

Which of the following is the most effective method for the detection of extremely deep-lying defects:

 
 
 
 

128.

What method provides greater sensitivity, particularly in locating subsurface discontinuities?

 
 
 
 

129.

Which type of current has a skin effect?

 
 
 
 

130.

When using the wet continuous method, the flow of suspension from the hose should be shut off?

 
 
 
 

131.

The area of maximum induced field strength using a yoke is:

 
 
 
 

132.

The strongest magnetic field in a coil is at the:

 
 
 
 

133.

What equipment is used to determine if a part has been demagnetized?

 
 
 
 

134.

Which of the following will best define surface cracks?

 
 
 
 

135.

Applying the theory of the ‘Right-Hand Rule’, a longitudinal surface defect in a round bar is detected by ‘current passing in a direction parallel to the direction of expected defects’ because:

 
 
 
 

136.

Why are magnetic particles available in different colours?

 
 
 
 

137.

A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented:

 
 
 
 

138.

Why is it preferable to disassemble parts before magnetic particle inspection?

 
 
 
 

139.

Fluorescent magnetic particle indications should be inspected under

 
 
 
 

140.

Why should one avoid using a high-velocity flow of wet testing media over the test area?

 
 
 
 

141.

What are the three causes of non-relevant indications?

 
 
 
 

142.

Magnetic particle inspection is not a reliable method of detecting

 
 
 
 

143.

A defect open to the surface produces an indication that is

 
 
 
 

144.

Wet magnetic bath strength is checked by which of the following

 
 
 
 

145.

When preparing a bath it is important to have the bath strength at a proper level, as too many particles can result in:

 
 
 
 

146.

Magnetic particle is a non-destructive examination method used for:

 
 
 
 

147.

A part is adaptable to magnetic particle inspection if

 
 
 
 

148.

The permeability of a material describes:

 
 
 
 

149.

If a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by:

 
 
 
 

150.

The flux within and surrounding a magnetized part or around a conductor carrying a current is known as:

 
 
 
 

151.

A metal that is difficult to magnetize is said to have:

 
 
 
 

152.

Which residual field is most difficult to demagnetize?

 
 
 
 

153.

Which brings out surface indications most clearly?

 
 
 
 

154.

To detect lengthwise defects on the inside diameter of hollow parts, you should:

 
 
 
 

155.

Which of the following is most often used for dry magnetic particle inspection:

 
 
 
 

156.

When a magnetic field is induced in a part with prods spaced 150mm apart, the field is:

 
 
 
 

157.

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?

 
 
 
 

158.

Which form of magnetization is easiest to control in most parts?

 
 
 
 

159.

The strength of a magnetic field within a coil is determined by:

 
 
 
 

160.

The field in a section of pipe being magnetized by means of a central conductor is stronger at:

 
 
 
 

161.

The space within and surrounding a magnetized part of a conductor carrying a current is known as:

 
 
 
 

162.

Subjecting the part to a magnetic field that is constantly reversing in polarity and gradually diminishing in strength accomplishes one of the following:

 
 
 
 

163.

The type of method most frequently used with mobile equipment is the:

 
 
 
 

164.

Which of the following is NOT a liquid vehicle in which particles are suspended in magnetic particle testing:

 
 
 
 

165.

The most common cause of non-relevant indications in MT is:

 
 
 
 

166.

When a ferromagnetic material is in an unmagnetized state, the domains are:

 
 
 
 

167.

Paramagnetic materials:

 
 
 
 

168.

What type of magnetization uses the formula:
I = 45000/(L/D)N where I is the current in Amperes, N is the number of turns of the
magnetizing coil, L the length of the cylindrical test piece, and D its diameter.

 
 
 
 

169.

The magnetic field is the strongest when:

 
 
 
 

170.

The retentivity of a material describes:

 
 
 
 

171.

A material with a wider hysteresis loop has:

 
 
 
 

172.

The unit usually used to denote flux density is the:

 
 
 
 

173.

Which technique is the most sensitive?

 
 
 
 

174.

An electric current through a copper wire:

 
 
 
 

175.

What rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor?

 
 
 
 

176.

The areas on a magnetized part from which the magnetic field is leaving or returning into the part are called:

 
 
 
 

177.

The opposition that a ferromagnetic material shows to the establishment of a magnetic field is called:

 
 
 
 

178.

The magnetism which remains in a piece of magnetizable material after the magnetizing force has been removed is called the:

 
 
 
 

179.

A material with a narrower hysteresis loop has:

 
 
 
 

180.

The correct number of ampere-turns for a given test specimen is determined by:

 
 
 
 

Question 1 of 180

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