factors on which NDT method can be selected.

1 Answer

Answer :

i) Codes or standard requirement

ii) Specification of material to be tested, for example, nature of material, its size and shape

iii) Type of disorders to be detected, also depend on nature of disorders.

iv) Testing also depends on manufacturing process of material to be tested

v) It is also depending on the equipments available for testing

vi) Total cost required to test the material.

Related questions

Description : Explain production of ultrasonic wave by using piezoelectric method. 

Last Answer : Principle: When the electric field is applied across the crystal its dimensions changes and when alternating PD is applied across crystal then the crystal sets into elastic vibrations  Working ... of crystal. Then the crystal sets into resonance vibration and ultrasonic waves are produced. 

Description : Are there any ndt position or etlectrical functional testing?

Last Answer : You could try calling an electrician and see what it takes to get aprenticed.

Description : Who should select the specific welds for NDT, to cover the 10% contractual percentage required by the specification/Code? a) Anyone can select the welds as its just a random choice b) The welder ... welding is always carried out to a high standard the use of percentage NDT is of no real value

Last Answer : c) This will be referenced in the inspection and test plan

Description : Why is it essential to clean the excess weld metal on completion of the production weld? a) So it can be ready for painting b) To remove any rust c) To ensure it is suitably clean for visual inspection and NDT d) To remove slag from the undercut

Last Answer : c) To ensure it is suitably clean for visual inspection and NDT

Description : t is permissible to allow trainee welder to carry out production welding? a) Never b) Yes as long as the supervisor is happy with his workmanship standard c) Yes as long as he has the approved ... cover the intended scope of work d) Yes as long as no NDT is required on the finished weld

Last Answer : a) Never

Description : Who should have access to the WPQR’S? a) NDT operators b) Inspectors only c) Welders only d) Welding Engineer

Last Answer : d) Welding Engineer

Description : State the importance of NDT and state working principle of Rebound hammer.

Last Answer : Importance of NDT: 1. The strength can be tested without physical breaking of concrete; hence it is safe. 2. It can give internal flaws, cavities and homogeneity details of concrete within short period. 3. ... . But if rebound of hammer is less, then tested concrete may be soft, porous and moist. 

Description : Explain construction and working of Coolidge tube for production of X-ray.

Last Answer : Construction:- It consist of hard glass bulb with cathode and anode as shown in fig. Cathode is a metal filament kept at negative potential to the filament. Target T consist of copper ... the filament current, the thermionic emission of electron hence intensity of X- rays can be controlled.

Description : Explain the construction and working of a photocell. State its any two applications.

Last Answer :   Construction: 1. It consists of evacuated glass bulb having cathode (K) and anode (A). 2. The semi cylindrical cathode coated with photosensitive material from inner side. 3. The anode is platinum rod. 4. The ... in Burglar alarm. 4) It is used in TV set. 5) It is used in fire alarms.

Description : Distinguish between Seebeck and Peltier effect .

Last Answer : Seebeck's effect Peltier effect When two dissimilar metals are joined together so that two junctions are formed and if one junction is heated and other is cooled then electric current flows ... difference. Amount of heat generated depends on pair of metals and current through it.

Description : Explain process of transmission ultrasonic testing and pulse echo UT testing.

Last Answer : Transmission UT method:- In this method two different tranducers are used, one acting as a transmitter and other acting as a receiver. The transmitter convers electrical pulse into sound signal. This sound ... fed to the input of CRT is called initial pulse as shown in following diagram.

Description : applications of X-rays

Last Answer : 1. X- rays are used to detect the cracks in the body of aero plane or motor car. 2. X- rays are used to detect the manufacturing defects in rubber tyres or tennis ball in quality control. 3. ... cure diseases like cancer. 11. X - Rays are used to detect bullets position inside the body.

Description : Define Work function and Stopping potential.

Last Answer : Work Function: It is the minimum energy required just to emit or detach or knock the electron from the metal surface.  Stopping potential: It is the negative potential of photoelectric cell at which photoelectric current becomes zero.

Description : State Joules law of heating.

Last Answer : Joules law : It state that the amount of heat generated (H) due to the flow of electric current through a resistance is directly proportional to  1) Square of the current ( I2 )  2) Resistance ( R )  3) Time for which current flows ( t )

Description : Explain variation of thermo e.m.f. with temperature. 

Last Answer : For a given thermocouple , the temperature of one junction is placed at 00C and temperature of other junction is increased by providing heat. The emf generated is measured with the help ... increases and reaches to maximum value and thereafter emf decreases, becomes zero and reverses its sign.

Description : State properties of ultrasonic waves.

Last Answer : i) Frequency of these sound waves is more than 20kHz ii) Shorter wavelength iii) They carry high amount of sound energy iv) The speed of propagation of ultrasonic waves increases with increase in ... . x) Posses certain vibrations which are used as good massage action in case of muscular pain. 

Description : Define centripetal force and centrifugal force

Last Answer : Centripetal force - It is defined as the force acting along the radius towards the center of the circular path, which keeps the particle in uniform circular motion.  OR  Centripetal force ... experiences force which is along the radius and away from the center is called Centrifugal force.

Description : State relation between linear velocity and angular velocity.

Last Answer : Relation between linear velocity and angular velocity is v = r ω 

Description : Classify the solids into conductors, semiconductors and insulators on the basis of band theory of solids. 

Last Answer : In conductors there is no energy gap between valance band and conduction band, they are overlapped on each other. So electrons can jump from valance band to conduction band easily and material ... band when some amount of energy is supplied to it. Therefore insulators cannot conduct the current.

Description : State properties of nano material. 

Last Answer : i. Mechanical property. ii. Structural property. iii. Thermal property. iv. Electric property. v. Magnetic property. vi. Optical property.

Description : What is Nano-technology? Define nano scale. 

Last Answer : Nanotechnology:-The branch of engineering that deals with things having the dimensions smaller than 100 nm is called nanotechnology.  Nanoscale:-The scale range from 1nm to 100 nm is called nanoscale. 

Description : Give applications of LASER. 

Last Answer : i) Lasers are used for engraving and embossing of printing plates For example- number plate, name plate etc., ii) Lasers are used in cutting, drilling and welding metals. iii) Lasers are used in ... fiber from one computer to other viii) Lasers are used to find flaws or defect in material. 

Description : Give the full form of LASER. 

Last Answer : Full form :  Light Amplification by Stimulated Emission of Radiation.

Description : How selected medical social and inherited factors disrupt body systems to cause ill health?

Last Answer : Many factors can cause ill health. Habits, or social factorssuch as smoking or drinking will damage the body. Medicaltreatments such as chemotherapy actually inject poison into thebody with negative side ... to disease such as Diabetes, Allergies,Heart disease and high cholesterol to name a few.

Description : A teacher in a classroom has immediate control over (A) the self, selected methods of communication and the message. (B) the audience, the noise and the reception. (C) the feedback, the technology and the audience experience. (D) the communication channel, other communicators, and external factors.

Last Answer : (A) the self, selected methods of communication and the message.

Description : A method in which desirable scattered favourable genes are selected in different plants in each generation

Last Answer : Ans. Recurrent selection

Description : Which is the method by which instructions are selected for execution: a. Instruction selection b. — Selection control c. Instraction sequencing d. All of these

Last Answer : c. Instraction sequencing

Description : To orient a plane table at a point roughly south of the mid-point of two inaccessible conical hill stations and in the plains, a point is selected in line with AB and table is oriented at by bringing ab ... , is (A) Unique and correct (B) Incorrect (C) Manifold and correct (D) Not reliable

Last Answer : (C) Manifold and correct

Description : In simplex method, if there is tie between a decision variable and a slack (or surplus) variable, ______ should be selected a. Slack variable b. Surplus variable c. Decision variable d. None of the above

Last Answer : c. Decision variable

Description : The method of alighting the aeroplane on water during a ditching is to: a. Carry out a normal approach with flaps and gear selected as normal but to calculate all speeds plus 10kts b. Reduce ... d. Fly a normal approach to stalling speed and then drop the aeroplane vertically onto the water

Last Answer : c. Fly a normal approach but keep the gear up and land at lowest possible speed with the nose raised for the tail to strike first

Description : When each member of a population has an equally likely chance of being selected, this is called: a. A nonrandom sampling method b. A quota sample c. A snowball sample d. A Random Sample

Last Answer : d. A Random Sample

Description : In simplex method, ........................ should be selected when there is tie between slack/surplus variable and decision variable. a. Slack variable b. Decision variable c. Surplus variable d. None of these

Last Answer : b. Decision variable