QUIZ) ASNT L3 BASIC 5

81. The line of force that form a path around a crack in a ring magnet are called

a. magnetic lines b. leakage flux c. field strength d. longitudinal field

82. A magnetic discontinuity which is break in the magnetic uniformity of a part is related to a sudden change in

a. inductance b. resistivity c. capacitance d. permeability

83. The most effective MT method for inspection of a large casting is the use of

a. multidirectional magnetization

b. a central conductor

c. prod inspection in two directions

d. direct magnetization

84. When testing for fine shallow surface cracks the preferred MT method should be

a. dry AC b. dry DC c. wet AC d. wet DC

85. The change in direction of an ultrasonic beam when it passes from one medium into another whose elasticity

and density differ from those of the first medium is called

a. refraction b. rarefaction c. angulation d. reflection

86. A testing technique in which the crystal or transducer is parallel to surface and ultrasonic waves enter the

material being tested in a direction perpendicular to the test surface is

a. straight beam testing

b. angle beam testing

c. surface wave testing

87. A test method in which the ultrasonic sound is emitted by a transmitting search unit, transmitted through

the test part, and picked up by a second receiving search unit on the opposite boundary is called

a. surface wave testing b. angle beam testing

c. through-transmission d. straight beam testing

88. The distance from a given point on an ultrasonic wave to the next corresponding point is referred to as a

a. frequency b. wavelength c. velocity d. pulse length

89. Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses?

a. 1.0 Mhz b. 2.25 Mhz c. 10.0 Mhz d. 25 Mhz

90. The product of the sound velocity and the density of a material is known as the of the material

a. refraction wave b. acoustic impedance

c. elastic constant d. poisson’s ratio

91. In an ultrasonic instrument the number of pulses produced by an instrument is a given period of time is

known as the

a. pulse length of the instrument

b. pulse recovery time of the instrument

c. frequency of the instrument

d. pulse repetition rate of the instrument

92. In a basic pulse-echo ultrasonic instrument the component that produces the voltages that activates the

search unit is called

a. an amplifier b. receiver c. a pulsar d. a synchronizer

93. In which medium listed below would the velocity of sound be lowest?

a. air b. waver c. aluminum d. stainless steel

94. Ultrasonic transducers are generally of piezoelectric material. Which of the material listed below does not

under any circumstances exhibit piezoelectric characteristics?

a. lithium sulfate b. quartz

c. barium titanate d. a-nickel

95. as the inpedance ratio of two dissimilar materials increases the percentage of sound coupled through an

interface of such materials

a. decreases b. increases c. in not changed d. may increase or decrease

96. Low frequency sound waves are not generally used to test thin materials because

a. of the rapid attenuation of low frequency sound

b. the transducer main bang will cause the material to noticeably vibrate

c. of poor near-surface resolution

d. none of the above will actually limit such a test

97. The maximum scanning speed possible is primarily determined by

a. the frequency of the search unit

b. viscous drag problems

c. the pulse repetition rate of the test instrument

d. the persistency of the CRT screen

98. The property of certain materials to transform electrical energy to mechanical energy and vice versa is called

a. mode conversion b. piezoelectric effect

c. refraction d. impedance matching

99. Most commercial penetrants have a specific gravity of

a. less than one b. 1.2

c. more than one d. 0.9

100. The ability of a penetrant to flow into a surface opening is influenced by which of the following properties

of the penetrant?

a. density b. surface tension and wetting ability

c. specific activity d. relative weight

 

 

 

 

 

 

 

ANSWER

81	82	83	84	85	86	87	88	89	90
B	D	A	C	A	A	C	B	D	B
91	92	93	94	95	96	97	98	99	100
D	C	A	D	A	C	C	B	A	B