Lesson 1: Introduction to UT

Question 1

The velocity of sound in a material is dependent upon the:

a. frequency of the wave.

b. wavelength.

c. material properties.

d. vibration cycle.

Answer 1

c. material properties.

Question 2

To vary or change the wavelength of sound being used to test a part, you would change the:

a. sound-wave frequency.

b. diameter of the transducer.

d. pulse repetition rate.

c. electrical pulse voltage.

Answer 2

a. sound-wave frequency.

Question 3

Ultrasonic vibrations are commonly used to examine materials for:

a. discontinuities

b. tensile strength.

c. permeability.

d. impedance measurement.

Answer 3

a. discontinuities

Question 4

The number of complete waves which pass a given point in a number of cycles per second is referred to as the:

a. amplitude of a wave motion.

c. frequency of a wave motion.

d. wavelength of a wave motion.

b. pulse length of a wave motion.

Answer 4

c. frequency of a wave motion.

Question 5

Sound waves with a frequency beyond human hearing range are referred to as ultrasonic waves or vibrations, and the terms embrace all vibrational waves of frequency greater than approximately:

a. 20 000 Hz.

b. 2 MHz.

c. 2 kHz.

d. 200 kHz.

Answer 5

a. 20 000 Hz.

Question 6

When referring to ultrasonic testing, the term used to define the rate at which sound waves will pass through various substances is referred to as:

a. frequency.

b. velocity.

c. wavelength.

d. pulse length.

Answer 6

b. velocity.

Question 7

The total number of ultrasonic waves that pass a specific point in a second is known as the:

a. amplitude of wave motion.

b. pulse of wave motion.

c. frequency of wave motion.

d. length of wave motion

Answer 7

c. frequency of wave motion.

Question 8

Compute the wavelength of ultrasonic energy in steel at 5 MHz. V, 5850 m/s (V=Xxf).

a. 1.17 mm.

b. 2.32 mm.

c. 0.11 mm.

d. Not enough information to calculate.

Answer 8

a. 1.17 mm.

Question 9

One megahertz is best expressed by which of the following:

a. 1000 cycles/second.

b. 1 x 10³ cycles/second.

c. 1 x 10⁶ cycles/second.

d. 100 KHz.

Answer 9

c. 1 x 10⁶ cycles/second.

Question 10

If the velocity of a longitudinal mode wave in a given material is 0.246 in./us (0.625 cm/us) at 0.5 in. (1.27 cm) below the surface, what is the velocity at 2 in. (5 cm) below the surface?

a. One-quarter the velocity at 0.5 in. (1.27 cm).

b. The same as the velocity at 0.5 in.

(1.27 cm).

c. One-half the velocity at 0.5 in. (1.27 cm).

d. Twice the velocity at 0.5 in. (1.27 cm).

Answer 10

b. The same as the velocity at 0.5 in.

Question 11

Material particles in the path of a sound wave:

a. travel with the wave.

b. do not react to the wave energy.

c. travel with the wave but do not react to the wave energy.

d. do not travel with the wave but react to the wave energy.

Answer 11

d. do not travel with the wave but react to the wave energy.

Question 12

It is the energy of the wave that moves through the material using the ________ as a means of passage.

a. molecular structure

b. elastic tendons

c. neutrons

d. protons

Answer 12

a. molecular structure

Question 13

The wavelength of a given wave is from:

a. trough to peak.

b. peak to trough.

c. trough to trough and is same as the distance from peak to peak.

d. trough to trough but is not the same as the distance from peak to peak.

Answer 13

c. trough to trough and is same as the distance from peak to peak.

Question 14

If the frequency is higher, the wavelength:

a. is shorter.

b. is longer.

c. stays the same.

d. is indeterminate, since frequency and wavelength are not related values.

Answer 14

a. is shorter.

Question 15

According to SNT-TC-1A, a Level I may:

a. determine the method to be used.

b. determine the technique to be used.

c. interpret and evaluate results independently.

d. perform specific calibrations.

Answer 15

d. perform specific calibrations.

Question 16

According to SNT-TC-1A, the certification of NDT personnel is the responsibility of

a. the client.

b. the employer.

c. a third party.

d. ASNT.

Answer 16

b. the employer.

Question 17

According to SNT-TC-IA:

a. the employer shall establish a written practice for qualification and certification of NDT personnel.

b. the employer may use SNT-TC-IA as the written practice for certification of NDT personnel.

c. the employer shall submit the written practice to ASNT for approval.

d. the written practice is not addressed or required by SNT-TC-1A

Answer 17

a. the employer shall establish a written practice for qualification and certification of NDT personnel.

Question 18

According to SNT-TC-IA, a Level III who is certified in a specific method:

a. should be certified in other NDT methods.

b. should have knowledge of other NDT methods.

c. is not required to have knowledge of other NDT methods.

d. should be certified in at least one additional NDT method.

Answer 18

b. should have knowledge of other NDT methods.

Question 19

According to SNT-TC-IA, a certified Level I:

a. may independently accept or reject the part being examined.

b. may accept the part being examined as long as it matches the test results of another Level 1.

c. may accept the part under the supervision of at least a Level III certified technician.

d. may record test results.

Answer 19

d. may record test results.

Question 20

Recommended practice SNT-TC-IA shall be used by the employer:

a. precisely as a reference regardless of the employer’s needs.

b. strictly as a reference regardless of the customer’s needs.

c. as a guide to establish a written practice that meets the needs of the employer and customer.

d. as a reference, but it is not intended to be used as a guide to establish a written practice.

Answer 20

c. as a guide to establish a written practice that meets the needs of the employer and customer.

Question 21

According to SNT-TC-IA, the employer:

a. shall have a Level III who is a fulltime employee of the company.

b. may use the services of a Level III consultant.

c. does not need to have a Level III or retain a Level III consultant.

d. may use the services of a Level II instead of a Level III.

Answer 21

b. may use the services of a Level III consultant.

Question 22

According to SNT-TC-LA:

a. qualification and certification are not related.

b. qualification is a written testimony that the individual has been properly qualified.

c. qualification is a written testimony that the individual has been properly certified.

d. certification is a written testimony that the individual has been properly qualified.

Answer 22

d. certification is a written testimony that the individual has been properly qualified.

Question 23

The frequency of a wave describes:

a. amplitude of a wave motion.

b. pulse length of a wave motion.

c. wavelength of a wave motion.

d. the number of complete waves that pass a given point in a given period of time.

Answer 23

d. the number of complete waves that pass a given point in a given period of time.

Question 24

What term is used to define the rate at which sound waves will pass through various substances?

a. Frequency.

b. Velocity.

c. Wavelength.

d. Pulse length.

Answer 24

b. Velocity.

Question 25

The factors that have the greatest effect on ultrasonic velocity are:

a. material density and wavelength.

b. elasticity and wavelength.

c. material density, elasticity, and wave mode.

d. the material thickness.

Answer 25

c. material density, elasticity, and wave mode.

Question 26

The velocity of sound in material is dependent on the:

a. frequency of the search unit.

b. electrical conductivity of the material.

c. electromagnetic properties of the material.

d. material and the type of wave being transmitted.

Answer 26

d. material and the type of wave being transmitted.