Ultrasonic Testing level-II
General Question
Q1. The time required to perform one complete cycle is called the?
Period
Frequency
Wavelenght
Velocity
Q2. Ultrasonic vibrations are generally defined as having a frequency above?
5,000 cps
20,000 cps
100,000 cps
1,000,000 cps
Q3. Wavelenght is defined as?
The distance a wave travel to the back surface of the specimen
The distance a wave form advanced while a particle makes on complete vibration or orbit
The number of cycles produced per second
The time required for a wave to reach a certain point in the specimen
Q4. A definite relationship exists among the three factors, velocity, frequency and wavelength. This relationship is expressed by the formula
F = λ x V
V = λ / F
F = V / λ
λ = V - F
Q5. The purpose of couplant is to
Filter undesirable reflections from the specimen
Tune transducer to the correct operating frequency
Reduce attenuation within the specimen
Transmit ultrasonic wave from the transducer to the specimen
Q6. Acoustic impedance is defined as
The product of material density and a wave velocity
The ratio of material density to wave velocity
The ratio of wave velocity to sound density
The product of wave velocity and frequency
Q7. A couplant can be
Water
Oil
A plastic material
All of the above
Q8. The formula expressing the angle of refraction of a sound beam passing from one material to another
Sin a/sin b =Velocity a/Velocity b
(Sin a x Velocity b)/Sin b = Velocity a
(Sin a x Velocity a )/Sin b = Velocity b
Both A and B are correct
Q9. The angle of reflection of an ultrasonic beam is:
Equal to the angle of incidence
Approximately four times the angle of incidence
Approximately half the angle of the incidence
Equal to the angle of refraction
Q10. Longitudinal (compression) waves produce vibrations which are
In the same direction as the motion of the sound
Perpendicular to the motion of the sound
Elliptical
Symmetrical.